It did not take very long. Maybe a couple of hours. As I remember, schematic was correct except for a couple of reference designators being wrong. Surprisingly, it worked almost the first time I did a simulation.A google search will show the same sentences including "AN012" all coming from inside AN013.
THANKS for the model. How long it took you to assemble that?!
Well, it all started when answering a thread where the OP proposed his own circuit to generate tringle waves (fliflop commanding 2 current sources). At that moment I recalled that there was one topology where a current source was running continuously, sourcing Ic, and a second one, sinking 2*Ic, 50% of the time. It always fascinated me the resourcefulnes it denotes.I have just been re-reading application note A012. I had forgotten how well written it was. This is a "must read" for anyone that wants a peak into some of the design concepts and decisions made in the creation of the ICL8038.
Thank you, atferrari, for bringing this wonderful circuit description back to my attention.
It did not take very long. Maybe a couple of hours. As I remember, schematic was correct except for a couple of reference designators being wrong. Surprisingly, it worked almost the first time I did a simulation.
Gracias for sharing it.
OK, I found the original A012 and A013 application notes.
There are some bits of history here...
Note that the application note number in my old catalog is A012, not AN012. However, the application Bertus found says it is AN013.1 and is dated November 1996.
Having tried "AN12" I failed to try "A012" Never wise enough.
My old A013 has a question #17 that is interesting.
Downloaded all already. Off to read it.
I have also included the list of application notes from the 1974 Intersil catalog as well as the application note request cards in case you need to order some copies for yourself.
Nice offer Richard. Gracias again.
Email sent. Gracias.Here is a scan of page 1 of my battered copy of the original Exar XR8038 datasheet.
There are 8 pages in all
If scanning the whole thing is of interest, I think I will need an Email address to send to as I will need to get large files to achieve acceptable quality.
What do you think of the front page ?
Edit looking at Richard's copy of the Intersil document A012 it looks as though Intersil rearranged it when they bought Exar. Much of the information is the same, there are a couple of scope traces on the original Exar doc.
I have a Brother ink jet printer/scanner model, MFC-290C. It can scan in color or black and white. The scanner has a paper feed but I am not impressed with its operation. This model also has a flat bed for scanning. I used the flat bed for these application notes.Hi Richard
Maybe unusual questions:
How do you do the scanning? It is very good; pages are sitting flat on the bed.
It seems that you have loose pages. Are they? Have you disassembled the whole book?
I just noticed your request.Hola Richard,
Could you see if this multilegged chip shows up in any of your Raytheon catalogs?
Just to satisfy curiosity of somebody else. Gracias.
Metal can - 12 legs
I like opening up parts that I can't identify. I don't plan on using them -- just want to see what is inside. I have opened up LH0032's and LH0033's. Lots of parts on a ceramic substrate with film resistors printed on it. I may try to find one that is open and take a picture...Oh Richard, you have been working hard for what I see. Gracias for that.
The part is actually in a plastic bag probably since when supplied and will be, probably again, never used. A hobbyist found it and is trying to know what is it. If we are talking parts for the military we are at a dead end.
I recall being given many years ago two or three bags with pairs of diodes with strange marking. They came from the PAM (US "plan de ayuda militar", as per what I learnt later) and were impossible to identify as well.
I still have some opamps in that metal can, LM10 IIRC.
BTW, that LH0033, what a nice buffer it would be for a function generator. If not all, I understand that most have been discontinued. Weren't they useful components?
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