With all of the time and effort put into this, that is the most pressing topic of discussion?

By no means! -- That said, I hold that effective communication is the veritable essence of instruction - and consistency, its soul!

I really thought it was a serious topic and project. But as time goes by it seems to be less of one.

But then you underestimate ---as did we--- the incredible challenges attending effective engagement of so diverse a readership --- For all that, it seems our dilatory progress owes far more to outside demands upon our time than to chaticizing, 'hairsplitting' or <insert the manifestation of perfectionism of your choice>

Hey, @shortbus? -- Should you genuinely doubt our commitment --indeed, even, alacrity-- as regards prosecution of this series - please 'keep tabs' on my blog (where you'll catch a 'glimpse' of our significant and on-going 'behind the scenes' efforts)

Are any of these interested parties named, "Snuffleupagus", by chance?

Aye! Lurkers, 'wall flowers' and 'die-hard' non-participants go with the territory Still... It must be confessed that an invisible 'Snuffleupagus' compares quite favorably with a conspicuous Soggoth

Soggoth (artist's depiction)


Disclaimer: I am unaware of the presence of 'Snuffleupaguses' or 'Soggoths' among AAC's membership!

Best regards
HP

 

With all of the time and effort put into this, that is the most pressing topic of discussion?

At the beginning of this I really thought it was a serious topic and project. But as time goes by it seems to be less of one.

Shortbus we take it vry seriously! That's exact reason we're fussy abt getting it right b4 publishing it to tutorial!

So if ur just saying clarification abt usage sounds too petty to post on here, I say plz remember these two points:

◊Our AAC _EHT Thread_ is ONLY place that all interested ppl plus EVERY active team member and _solitary student_ knows where 2 to read for latest info abt series! Cuz _Hypatia's World_ forum on U of M ProvoServ is basically private (by which I mean restricted to select faculty and grad students per school policy) and IEC forum's host's paranoia abt tort and liability makes them basically demand submission of publicly visible résumé just to gain full membership (which is required to view most threads including ours) so that drives most ppl away based on privacy and security issues and I don't blame them at all!

◊This thread is NOT tutorial! So it's function is public-view development area, meeting place, bulletin board, and basically informal contact point for tutorial business including venue for addressing reader questions, suggestions and other feedback!

Shortbus like I said in post, I'm sry abt it's trifling nature but it was totally necessary and this was definitely appropriate place for it! Cuz tutorial development is basically _open source_ effort!

Should Lori, or, for that matter, any interested party, desire a 'louder' voice as regards proofing, suggestions, etc... They may jolly well register with AAC and participate here! -- I've scant patience with team members excusing their non-participation here on 'privacy grounds' all the while maintaining a running 'stream of consciousness' on social media sans the least vestige of anonymity!

I totally agree with HP! Anyone on social media using their real name can't claim _privacy_ as excuse for not registering on AAC! So I can't insist ppl register but if ur finding series useful or even just interesting then we'd definitely like to hear from u on here!

So here's absolutely sincere disclaimer: Nobody involved with EHT tutorials has business or personal connection to EEtech at all! But we're vry grateful for high profile _web presence_ our thread enjoys just by being hosted on here!

 

Guess I have lead a very simple and uninformed life. Never heard that the "students" were allowed or invited to chastise the writers of a hand book or teaching manual.

 

Never heard that the "students" were allowed or invited to chastise the writers of a hand book or teaching manual.

Indeed... But who will deny the potential benefits of an interactive approach?

Guess I have lead a very simple and uninformed life.

Not at all! -- 'Tis merely that communication technology (CIP the 'Internet' via the 'WWW' and advances in hardware/accessibility) is changing the nature of instruction (and, indeed, human interaction in general) -- Thus it is that we may offer an (essentially) real-time development environment to all interested parties deigning to register and/or participate (hence our well-intended 'scolding' of Lori H.) --- I can but imagine the annoyance occasioned readers encountering references to/quotations by 'off-list contributors' -- à la attempting to 'follow' one side of a telephone conversation

To be clear - 'lurkers' are welcome --- Should they wish to become part of the project, however, - As a courtesy to all involved, we prefer they participate here!

Very best regards
HP

 

@theodoravain, @Jazz2C, AM, AW, AP, BB, CR, JH, LH, KN, LK, SF, SM, TG, TW (et al) --- and anyone who cares:

Please be advised that @Aleph(0) plans return to active participation here following 'the holidays' (i.e. late December/early January) at which time this thread will be 're-activated' with emphasis upon prioritization of subject matter pursuant to ---would you believe--- moving ahead getting on with it!

Specifically:

1) 'Tying up loose ends' Re: construction of 'prerequisitional' instruments/equipment (with emphasis upon the EHT indicator --and-- the high-current/Low EMF PSU) --- Note that imaging for said projects is well-nigh complete (and resident in my blog)...

Please note that although said articles will be presented as construction examples ('TIHIDIs', if you will, based upon components I've ready to hand - and with an admitted tendency toward 'overkill' as regards most readers' requirements) -- you may rest assured that alternate approaches drawn from many excellent (AAC member) suggestions will be linked and discussed -- Please! By no means allow my penchant for over-design and 'bells and whistles' to create a perception of necessarily excessive expense/complexity! - Alternate 'routes' to wholly satisfactory results exist - as will be apparent in the completed articles Then too, as always, continued/further input (from registered AAC members) is welcome and encouraged!

2) 'Perfection' of (LOPT) core disassembly.

3) Completion of the LOPT modification tutorial via amendment of the disassembly procedure and addition of an LOPT testing procedure via a very low-power non-resonant Royer circuit... --- Note that common expedients (e.g. 'ring testers', etc) are unsuitable for their failure to evaluate insulation integrity at 'working' EMFs)...

Very best regards
HP

PS @Aleph(0) or @theodoravain --- Please 'GTM' the team such that we might re-establish α/β timelines --- many thanks!

 

@Hypatia's Protege @theodoravain @cmartinez @shortbus @The Electrician and everyone!

I'm seriously thinking abt asking mods to move thread back to on topic fora (like _pwr electronics_ or _projects_ or wherever) cuz OT forum is getting to be total _three ring circus_ and it looks like site Mgmt's plan to cure that is requirement of minimum _on topic_ post count to access off-topic forum (which I say is very good idea) but it will make recruiting new AAC members from alpha team and lurkers virtually impossible as long as EHT thread is in OT.

So I know that means we'd need to adhere to on-topic standards (so more focused, less casual atmosphere) but since I can totally handle that I say everybody else can! Anyhow I say contributors deserve dignity of on-topic effort by it appearing in on-topic (and so explicitly serious) forum!

So anyhow ppl, please let me know what u think?

PS @Aleph(0) or @theodoravain --- Please 'GTM' the team such that we might re-establish α/β timelines --- many thanks!

HP, tnx! It's in the works!

Please be advised that @Aleph(0) plans return to active participation here following 'the holidays' (i.e. late December/early January)

Just so everybody knows I'm not being _standoffish_ just vry busy!

 

I'm seriously thinking abt asking mods to move thread back to on topic fora (like _pwr electronics_ or _projects_ or wherever) cuz OT forum is getting to be total _three ring circus_ and it looks like site Mgmt's plan to cure that is requirement of minimum _on topic_ post count to access off-topic forum (which I say is very good idea) but it will make recruiting new AAC members from alpha team and lurkers virtually impossible as long as EHT thread is in OT.

Doesn't matter to me, but, it seems like you're yet again kowtowing to people who this project is meant for, but doesn't mean enough to them to join the forum! Personally I say "screw them". I'd be willing to bet that my name can't be found by just the screen name, so what are they so worried about???

 

I'm seriously thinking abt asking mods to move thread back to on topic fora (like _pwr electronics_ or _projects_ or wherever) cuz OT forum is getting to be total _three ring circus_ and it looks like site Mgmt's plan to cure that is requirement of minimum _on topic_ post count to access off-topic forum (which I say is very good idea) but it will make recruiting new AAC members from alpha team and lurkers virtually impossible as long as EHT thread is in OT.

So I know that means we'd need to adhere to on-topic standards (so more focused, less casual atmosphere) but since I can totally handle that I say everybody else can! Anyhow I say contributors deserve dignity of on-topic effort by it appearing in on-topic (and so explicitly serious) forum!

So anyhow ppl, please let me know what u think?

As you are well aware I'd welcome this thread's re-location to appropriate fora accompanied by a technical/scientific (i.e. on-topic) shift in 'thread culture' --- You will recall that my suggestion (and subsequent re-location) of this thread to 'off-topic' (lo these three years) was in deference to (what I perceived as) "your generation's" insistence upon a 'social media' posting/interpersonal style...

That said, it must be understood that this thread's scope of legitimate (i.e. 'on-topic') subject matter -- while centered about development of EHT systems-- touches such diverse ports as health physics, CAD suite use/implementation, general physical science, mathematics, 'math suite'/hand-held calculator use --- and many 'points in between'! --- Stated otherwise: this thread and associated tutorials/projects represent an educational effort - as opposed to a course of 'recipes' --- All of which is to say - Assuming said scope is acceptable to the moderation team - I'm all for the move!

To be clear -- I regard most technical/scientific discussion (having some bearing upon the series or educational/'logistical' value related thereto) as 'on topic' --- Whereas 'chit chat', 'philosophical musing', gossip, and similar manifestations of palaver are strictly out-of-bounds!

Anyhow I say contributors deserve dignity of on-topic effort by it appearing in on-topic (and so explicitly serious) forum!

Exactly!

Very best regards
HP

 

Doesn't matter to me, but, it seems like you're yet again kowtowing to people who this project is meant for, but doesn't mean enough to them to join the forum! Personally I say "screw them". I'd be willing to bet that my name can't be found by just the screen name, so what are they so worried about???

--Emphasis added---

Hey @shortbus -- Believe me! I hear you! -- That said we can hardly attain the 'moral/intellectual high ground' while 'hiding' back of off-topic's relaxed content policy -- Frankly I've not infrequently had occasion to doubt my wisdom in requesting this threads' relocation (to off-topic) -- As you (and others) have pointed out over the years, the tone of this thread too often descends to that of a 'social media' site -- while I feel that has significantly improved, a move to on-topic (as per @Aleph(0)'s suggestion) may very well send the 'right message' to all readers -- including prospective registrants

Many thanks and very best regards
HP

 

--Emphasis added---

Hey @shortbus -- Believe me! I hear you! -- That said we can hardly attain the 'moral/intellectual high ground' while 'hiding' back of off-topic's relaxed content policy -- Frankly I've not infrequently had occasion to doubt my wisdom in requesting this threads' relocation (to off-topic) -- As you (and others) have pointed out over the years, the tone of this thread too often descends to that of a 'social media' site -- while I feel that has significantly improved, a move to on-topic (as per @Aleph(0)'s suggestion) may very well send the 'right message' to all readers -- including prospective registrants

Many thanks and very best regards
HP

And you honestly think the thread will stay on topic if moved to another forum? Isn't going off topic why it was moved here? How many threads overall in this or any online forum stay on topic? Or for that matter any class room where there is allowed participation? I've never experienced it but then I'm not an academic. When in industry a meeting where all could participate they soon devolved, now 'lectures' on something(usually an a$$ chewing) were different, just my limited experience in life.

 

Isn't going off topic why it was moved here?

My request for this threads' placement in 'off-topic' (3+ years ago) came at a time when it was little more than a quasi-personal discussion between @Aleph(0) and myself Re: mutual interests (to wit: EHT, Radiography/Radiology, IEC devices, etc) given to copious digressions upon purely personal - indeed even spiritual and political - matters. As a newcomer to this community I was keen to avoid establishment of an unfavorable 'first impression' via what (then) amounted to little more than casual socialization in on-topic fora...

But to the present:
Granting that legitimate subject matter Re: so multi-faceted/general an area as design, construction and implementation of EHT systems - offered, as it is, to so eclectic a target readership is necessarily rather broad (as outlined in post #1848 quoted below):

That said, it must be understood that this thread's scope of legitimate (i.e. 'on-topic') subject matter -- while centered about development of EHT systems-- touches such diverse ports as health physics, CAD suite use/implementation, general physical science, mathematics, 'math suite'/hand-held calculator use --- and many 'points in between'!

To be clear -- I regard most technical/scientific discussion (having some bearing upon the series or educational/'logistical' value related thereto) as 'on topic'

I feel, nonetheless, that the delineation is quite clear -- specifically; On-topic content will consist of one or more of the following:

1) Scientific/technical content relevant to the series.
2) Discussion of the series itself (e.g. 'pedagogy', maintenance of 'focus', determination of 'direction', etc...)
3) Open interaction with readers/team members Re: feedback, suggestions/corrections, on-topic questions/comments etc...

4) Civil discussion/resolution of differences of opinion (as regards content, tutorial development, etc) among team members, readers and all interested parties.

5) Related health and safety topics including comprehensive discussion of same beyond mere "dos" and "don'ts".

And you honestly think the thread will stay on topic if moved to another forum?

Indeed I do!
Firstly, please know that @Aleph(0) has spontaneously suggested consideration of (and personally favors) the move!

Then too, site bylaws (Re: on-topic fora) demand adherence to topic (or, at very least, eschewal of idle socialization, bickering, etc) --- under penalty of 'edits', post deletion or (YIKES!) thread closure! Sweet 'tho the 'carrot' may be -- 'tis the 'stick' that speaks loudest!


Very best regards
HP

 

Ok so it seems like nobody has major objection to moving thread back 2 on topic?

So I say just to give it a few weeks to get message out abt on topic rules and like that. Then I'll definitely PM Moderation staff with request to move thread (when I'm back on here on regular basis in January)

As you (and others) have pointed out over the years, the tone of this thread too often descends to that of a 'social media' site -- while I feel that has significantly improved...

HP I totally agree! So transitioning thread to like _full-time_ on topic doesn't have 2b vry painful at all!

So happy holidays everyone! I'll see you all next year!

 

My request for this threads' placement in 'off-topic' (3+ years ago) came at a time when it was little more than a quasi-personal discussion between @Aleph(0) and myself Re: mutual interests

Yeah, thanks! I've wondered why this is in off-topic.. Well.. Now I'm curious.. Recalling her strong feelings to the contrary last spring (when the thread was mistakenly thought to reside in a technical forum) I'm surprised Julie (Tag: @Aleph(0)) wants a switch now? I mean what's changed?

I'm cool with a move but won't the "appropriate" forum change as focus shifts from construction to application? Sure, Power Electronics is Da glove throughout construction chapters but when you get to "EHT Applications" it's gonna be Physics.

@HP I hope you know I'm right with your decision to omit explicit instructions for assembly of ionizing radiation generating equipment! Sure it's sad but it's the price of omnicasting, yeah! I get it! Now then I'm pleased you plan a treatise on "radiographic technique" (applied to inanimate objects and non-human organisms) but I don't follow your decision to omit all (including non-human) radiology? That means mutation breeding is off the table, doesn't it? You might want to rethink that! There's huge interest there!

Oh yeah! I received your e yesterday, tried to sign on but Zen. wasn't having it! US servers are holding for now, though..

Thanks!

 

I'm pleased you plan a treatise on "radiographic technique"

Hope it doesn't take as much time as this one, I am almost 71 after all.

 

---Attention LV_PSU builders---

Circuit update:
Please bypass the output of the opto-triac with a slew-rate limit filter.

Details:
A generally suitable arrangement may be fabricated via series connection of a 47nF@400V polypropylene film capacitor with a 47Ω/250mW non-inductive resistor -- the 'free ends' of said components thence being connected (one-each) to the opto-triac (S101S05V) output terminals.

Rationale:
Enforcement of compliance with (the triac's) maximum off-state EMF rise rate characteristics (i.e. dE/dt and dE/dt(commutation)) under worst case conditions. --- Please note that, owing to circuit topology, the contactor's snubber exerts no significant effect upon said condition.

Likely consequences sans remediation:
Unbidden (i.e. dE/dt triggered) triac conduction (and, hence, contactor activation) at certain power-up/line disturbance and commutation phase-angles with resultant damaging inrush currents...

Please note that the above described changes will be reflected on the next revision of the soft-start system schematic.

Best regards
HP

//////////////////////////////////////////////////////////

PS
@theodoravain -- Many thanks for your reply/input! Will respond in full as soon as time permits!

Hope it doesn't take as much time as this one, I am almost 71 after all.

Aye! - 'Tis a bit like that old Zager and Evans (sp?) tune... -- "In the year 7510 if the next section's a-coming it oughta make it by then"

Again! Very best regards and many sincere apologies for the 'snafus' and post-n-dash!

 

Now I'm curious.. Recalling her strong feelings to the contrary last spring (when the thread was mistakenly thought to reside in a technical forum) I'm surprised Julie (Tag: @Aleph(0)) wants a switch now? I mean what's changed?

Theo u should remember it was just cuz of misunderstanding! So they were insisting on on-topic rules cuz they mistakenly thought thread was in on-topic fora. But since I thought they knew it was in off-topic I thought we were being held to like a _double standard_ So that's what my _strong feelings_ were abt!

Now being totally honest, mistaking this for _on topic_ thread was vry easy oversight to make cuz based on title and subject matter, on-topic fora exactly where it belongs!

So anyhow it got me thinking and I say advantages of being in off-topic are totally outweighed by huge advantages of moving thread to on-topic forum!

So if ur wondering what _last straw_ for me wanting move was just look here:

@theodoravain, @Jazz2C, AM, AW, AP, BB, CR, JH, LH, KN, LK, SF, SM, TG, TW (et al) --- and anyone who cares:

It totally appalls me seeing all those ppl (identified just by their initials) who are vry active on series but non-participants HERE on thread (now I know some of them are AAC members which is vry good! But we'd like them on thread too)

Anyhow nobody has to tell me we chose hard path trying to bring dignity of serious scientific (instead of just trade) interest to subject (by which I mean HV, x-rays, orthovoltage tubes, and like that) that a lot of ppl think on as strictly medical equipment or even just stuff of _parlor tricks_! It's been a total uphill climb getting ppl to take us seriously cuz this is site for electronics professionals so _medicos_ and _magicians_ need not apply!

So I say a huge part of problem is we need to _put our electronics professionalism where our mouth is_ and huge part of that is staying On-Topic in On-Topic forum!

Anyhow since rest of your questions are best answered by @Hypatia's Protege I'll totally leave them to her!

OBTW I totally agree abt Zenmate! I'm having to play _musical servers_ between HK and US now just to stay connected So I say it only goes 2 show u get what u pay for!

 

@Hypatia's Protege

HP I'm totally leaving radiometrics 2 you! Cuz I'm totally through bickering with ppl who don't listen and so can't understand distinction of _monitor units_ and RADs! Cuz they don't get it's abt measurement technique which I say is too f'in arbitrary anyhow!

Also on other point, have fun explaining distinction between absorbed and equivalent dose and fact that dosimeter has vry little meaning determining energy delivered to anything other than human tissue!

HP seriously! It's not me being impatient! Just their antagonistic attitude that totally puts me off! So I don't mind being asked even vry basic questions or being called on apparent _contradictions_ at all! But that's not what's happening cuz it's just gainsaying NOT discussion! So YOU explain it to them cuz I say real problem is too many ppl buying into stereotype of my generation! But it's lame any way around cuz like ur always saying _in this day and age nobody needs to take anybody's word for anything_!

Aye! - 'Tis a bit like that old Zager and Evans (sp?) tune...

HP so here's type of comment I won't be able 2 make if and when we're on on-topic forum but for now I can

So there's verse in that tune I just never understood! Here:

In the year 4545
Won't need no teeth, won't need your eyes
Won't find a thing to chew
Nobody's gonna look at you

That's just daft cuz eyes are for SEEING! Not being seen!

 

@Hypatia's Protege so I'm totally snowed down with email but from just skimming one thing a lot of ppl definitely want clarified b4 we even start on circuit descriptions is whether we're using _electron flow_ or _conventional flow_ paradigm? Now I know both perspectives are basically BS (except in vacuum where I say it makes way more sense just thinking on electrons as β- betas which is exactly what unbound electron is anyhow!) cuz whole point is CHARGE FLOW! But since _reader friendliness_ forces us to take sides I say electron flow is way better perspective! So I agree with you that like _cascade reaction flow_ is best description for charge migration in conductors and plasma but I also agree that w/o some scope we're just trying 2 teach whole history of universe!

HP just one other thing is some ppl are worried that trip temp of MO magnetron TCOs (130°C so like 270°F) is too high to prevent damaging pwr resistor? So IMO ceramic or sand resistors (like suggested by @shortbus) can totally handle that temp! And linear incandescent lamps (like suggested by @cmartinez) don't need overtemp sensor since their power handling is based on being continuously connected across line anyhow!

So remaining question is what is absolute max safe temp of those 100W _Dale_ type resistors?

So I FINALLY got datasheet to upload but it's mostly in Japanese and I don't have time to manually translate it now (u can forget Google translate cuz it makes total mess of tables). Anyhow just translating product description I say mention of _high temperature epoxy_ gives me ambivalent heebie-jeebies cuz I say _high temp_= good but _epoxy_= Not so much! So anyhow I attached datasheet so u can have go at logograms (which I know u like so much!).

 

Try this .... it might be difficult to read ....



p.s. I just grabbed a part number and did a search for it.

 

Try this .... it might be difficult to read ....
p.s. I just grabbed a part number and did a search for it.

JoeJester tnx!

So anyhow from datasheet info it turns out PCN resistors are vry disappointing pwr handling-wise Cuz number right of case-style descriptor is NOT continuous pwr handling spec!

So as examples:

◊RHF100 (which is in FM2 {flanged 2 terminal}) package has continuous pwr handling specs = 12W (free-air) and = 30W mounted to heatsink.

◊RHF250 (which is also in FM2 package) has continuous pwr handling specs = 20W (free-air) and = 50W mounted to heatsink.

Now good thing is dielectric strength spec of 4.5kV(ac), Max case temp spec = 150°C and max instantaneous current is at least 50A based on extrapolation from other resistors in same package!

So for RHF100M2 package (which is best for space economy and easy mounting):
RHF100M2 20Ω resistor isn't listed, but other products in same package specify _maximum running current_ of 170A (for 1Ω resistor) to 50A (for 350kΩ resistor)! So no problems with maximum instantaneous current < 10A!

Sry if all that's too boring but whole point is to just think on max specs in terms of energy instead of power! Cuz brief exposure to max voltage of 120V at max current of 6A won't harm it! (o/c 720W would destroy it in less than 2 min assuming _cold start_ but in normal operation we're only talking milliseconds of _line shunt_ condition!)

Since low-temp (down to like 75°C) TCOs are easily available, resistor can be protected from slow-overheating caused by, as example, too many _starts_ in too short time period, soft-start failure or contactor problems failing to bypass resistor during light load and like that, cuz heat from _minor_ overload has time to migrate to resistor case and trip TCO b4 it's too late.

So here's problem:
Based on experiments @Hypatia's Protege's been doing, a persistent worst-case overload (which is [in RMS values] 120V at 6A) would definitely destroy resistor b4 case temp rose enough 2 trigger TCO!

So just as example, starting at room temp u can hold resistor shunting 120V line in bare hand for 1 min (so abt 42kJ of internal heating which I say is WAY too much!) b4 case gets too hot to handle (≈60°C) and then disconnecting from line, case continues to heat to abt 230°C during next three min!

So HP and I both say there needs 2b front panel indicator that shows presence of voltage across resistor (which can be easily set up using diac or just zener and a few other components). Also since drop ≤ 15V can't hurt resistor (cuz 15V^2/20Ω < 12W), vry low drops like from just magnetizing current (≈20mA*20Ω≈400mV) or vry light load don't need 2b detected cuz purpose of lamp is just to warn that resistor is being abused not comprehensive diagnostic!

But here's major point! _Ready light_ and _Bypass Fail light_ are definitely NOT redundant!

◊Ready light means SS circuit has detected uninterrupted line condition for at least _ballast interval_ (abt 600ms)_ and ballast bypass signal is asserted.

◊Bypass Fail during _ready_ means failure in the SS circuit or contactor is causing abuse to ballast resistor! Absence of _Bypass Fail_ just means ur not damaging ballast resistor! It doesn't guarantee resistor is totally bypassed! So I say it's like _idiot light_ on vehicle instrument panel: on=trouble, off doesn't necessarily mean everything's ok, it just means means _nothing critical_ (yet!)

PS
ATTN: Alpha team: Just so you know! The entire core Dev team are agreed: Refusing to attentively read bulletins, excusing inattentiveness with _TL;DRs_ and other types of laziness will no-longer be tolerated and catered to! Now if you missed something cuz we did a poor job explaining or describing, or if u disagree with accuracy of our scientific/math/technical statements or like that, that's totally different! What I'm talking abt is ppl who expect us to basically _chew their food_ for them! Questions are totally welcome AFTER u read the posts/bulletins! If that's asking too much then plz excuse yourself from the team!

ATTN: Everybody else!: Plz don't be shy! The above notice only applies to Alpha team members!


OBTW I hope 2 be back on AAC in abt a week. So HP looks in on regular basis but she's very busy finishing and perfecting LVPSU project and putting EHT meter article together! So she told me she'll be happy to briefly respond to questions and comments!