I don't know why you are getting that signal in 3rd png?
I ended up using the circuit I showed earlier, but I did assemble the version in the AN3006 fig3 and scoped it and got the clean pulse as shown in Fig 4. also at the output of the H11L1.
Max.

 

I don't know why you are getting that signal in 3rd png?
I ended up using the circuit I showed earlier, but I did assemble the version in the AN3006 fig3 and scoped it and got the clean pulse as shown in Fig 4. also at the output of the H11L1.
Max.

thanks Max yeah i like to do things backwards sometimes - basically i try to do more than one thing at once, i think i know how i'm getting that 'incorrect' signal.

so many parts and fun things to learn, i probably need to just stick to the schematic and get something done.

i think that signal is as a result of a harmonic from a 'filter' i have attached to the 240v before the 240v side of the transformer:


so far it goes > 240v wall > the 'filter' > then the input of the Trans > 24v - 10v out of trans > 10v full rectified > > some 'resistors' > the octo.

anyhow i'll keep you updated as i go, i'm interested to see how the current limiting aspect works. i'll remove the likely offending part also.

(hope it's not my cheap scope anyhow, it's just a new one 25mhz )

 

I can't see an input filter causing it?
Max.

 

I can't see an input filter causing it?
Max.

dam hope my scope is not malfunctioning, any suggestions?

however i don't have the limiting aspect in place when i screened that.

it seemed persistent - i'll try again.

 

I can't see an input filter causing it?
Max.

a bit more success _ swapped out the Opto to a Moc20~

still don't know what that other artifact is after the pulse.

this is just across the output - the VDC is being supplied by a common bench and there is a Led and some resistors in there (the led on the output side was there so that i could see the Opto was working) the trigger for the opto is the 10v rectified AC.

this is at least a small breakthrough for me ha ha - i tend to be very 'unlucky' well 3 of the opto were non functional (admittedly 2 were salvaged from a cheap bad Chinese electronic)

 

So you haven't used a H11L1 Schmidt trigger opto?
Max.

 

So you haven't used a H11L1 Schmidt trigger opto?
Max.

no max , no i didn't , i feel that this was now important in retrospect.... yes?

 

It worked well for me.
Max.

 

So you haven't used a H11L1 Schmidt trigger opto?
Max.

https://en.wikipedia.org/wiki/Schmitt_trigger

oh yeah i can see how that is important now in retrospect - ha ha.

and indeed partly back to my original guess that this device was playing a significant aspect in the whole.
you live and learn.

 

It worked well for me.
Max.

for me that current decent signal i consider 'good' and something to work from now. but considering the H1L11 has what amounts to a "comparator circuit with hysteresis"
that starts to make a lot more sense to me now.

 

I also had comparable results on the 'scope as Post #27.
Max.

 

I also had comparable results on the 'scope as Post #27.
Max.

comparable to the AN-3006?
indeed, i can now keep progressing that i have something that at least resembles the correct config.

 

comparable to the AN-3006?
.

Yes.
Max.

 

@K.e:

 

Yes.
Max.

interesting - I hooked a zener inline with the 10.8 / 11~ (mean)V DC rectified - however i used a 5.2v~ Zener (which uses the 'zener' effect) (so called 'Quantum tunneling')

I get by probing Gnd and post the Zener 7.4 V with this waveform (see attached) which shows that indeed it does structure the pulse with a much more definite 'Off' status.

however if i use a 10v zener i get something like 4.6 v out the other side - i guess this is because it is related to the curve preceding the Zener cutoff i guess that curve is not linear.

you can see the difference however between 'Zener' and 'no Zener'

(although i'd hardly call this scientific as i had the opto hooked up with the 'non zener' image) however the Zener effect seen in the image is apparent.

@EM Fields

thank you for the image any chance I could get a link to the source - when uploading to the forum the compression causes the image to be of not usable resolution. i.e i can't read the info even with Downloading and zooming.

 

I did not reference the scope to GND (bridge neg) but 'scoped the H11L1 input.
Max.

 

interesting - I hooked a zener inline with the 10.8 / 11~ (mean)V DC rectified - however i used a 5.2v~ Zener (which uses the 'zener' effect) (so called 'Quantum tunneling')

I get by probing Gnd and post the Zener 7.4 V with this waveform (see attached) which shows that indeed it does structure the pulse with a much more definite 'Off' status.

however if i use a 10v zener i get something like 4.6 v out the other side - i guess this is because it is related to the curve preceding the Zener cutoff i guess that curve is not linear.

you can see the difference however between 'Zener' and 'no Zener'

(although i'd hardly call this scientific as i had the opto hooked up with the 'non zener' image) however the Zener effect seen in the image is apparent.

@EM Fields

thank you for the image any chance I could get a link to the source - when uploading to the forum the compression causes the image to be of not usable resolution. i.e i can't read the info even with Downloading and zooming.

Yeah, sure. I'll get it to you, along with the LTspice circuit list so you can play with the circuit, sometime today or tomorrow. Would you like a circuit description as well?

 

Yeah, sure. I'll get it to you, along with the LTspice circuit list so you can play with the circuit, sometime today or tomorrow. Would you like a circuit description as well?

sure anything you could provide would help - i'm on a learning curve here ha ha.

Max thank for the input, I have come off the 10v and run it though another bridge - then though a set of 2 Caps and an 'inductive' choke it is giving me beautifully clean 17.6 VDC now - my theory is now to try to experiment with triggering the gate for pin 2 on the 555 - with the bridge (1) and supply the 555 with Bridge (2).

so that's fun and i've learned a lot so far.

 

@K.A

Download all of these files into a single folder and, if you've got LTspice on your machine, when you left-click on the .asc file LTspice should respond and you'll see the schematic on your monitor.

The .png file is the source of the graphic I posted earlier.


https://www.dropbox.com/s/b8h96s0k3t3ljze/74hc02.asy?dl=0
https://www.dropbox.com/s/ds374vbplzh9x9f/Soldering iron temp control.png?dl=0
https://www.dropbox.com/s/zuo5xdu9hd1b2cu/74HC.lib?dl=0
https://www.dropbox.com/s/e1e9ai5cvq4j3og/Soldering iron temp controller.asc?dl=0

 

@K.A

Download all of these files into a single folder and, if you've got LTspice on your machine, when you left-click on the .asc file LTspice should respond and you'll see the schematic on your monitor.

The .png file is the source of the graphic I posted earlier.


https://www.dropbox.com/s/b8h96s0k3t3ljze/74hc02.asy?dl=0
https://www.dropbox.com/s/ds374vbplzh9x9f/Soldering iron temp control.png?dl=0
https://www.dropbox.com/s/zuo5xdu9hd1b2cu/74HC.lib?dl=0
https://www.dropbox.com/s/e1e9ai5cvq4j3og/Soldering iron temp controller.asc?dl=0

hey thanks greatly for this - and for taking the time to share - i don't presently have LTspice but am sure i can acquire it.
thanks for the higher res image - i'll look it over to see what else i can learn here.

regards.