Bipolar PI design

[ivconic]

Finally, this concept would look like this when included in the rest of the schematic (click to enlarge):
(D1 and D2 may not be needed (friend's suggestion). But it is good to provide a place on the pcb for them, just in case)

[ivconic]

In an attempt to come up with the simplest but at the same time the most effective solution for replacing the 4053, I put together a very simple concept.
The funny thing is that in the "mind" it works very well but in the Proteus simulator it doesn't!??
Ha, ha, ha!
In the Proteus simulator, it only works when I turn Q3 and Q4 upside down so that their "sources" go to ground.

[ivconic]

Excellent! Comet is also present here in Serbia! Thanks Algan!



Are there any essential differences between these two chip models?

I just found the difference, it's the packaging that makes the difference.
The pictures are the same so it's confusing. Ok, the "mystery" is solved.





Kudos Carl, good decision to move ITMD3 to a more visible place!

[algan]

Carl ,can you tell me what the consumption is for just the TX without the rest of the electronics? Thanks.

[algan]

If it's through tme.eu they are from Poland the delivery is expensive if it's just for one integral it's not worth it, but here in Bulgaria a local store orders and sells at double the price it comes in about 2 weeks, and if it's through Farnell the store is in England it's ordered from the https://store.comet.bg/CatalogueFarn...JpcHAiOiIyMCJ9 website there is some tax the order arrives in about 5-7 days

[ivconic]

[GeoMax]

Hi

you can get the PIC16F18426 chips on amazon.de as well...

[ivconic]

Algan... You are again my dearest brother!

[ivconic]

Algan... you ar not my brother anymore:

[ivconic]

Algan from now on You are my brother!

[algan]

where to buy PIC16F18426...

https://bg.farnell.com/microchip/pic16f18426-i-p/mcu-8bit-pic16-32mhz-dip-14/dp/2857684

https://www.tme.eu/bg/details/pic16f18426-i_p/semeistvo-pic-8-bitovi/microchip-technology/

You can tell your friend from Bulgaria and he will order it for you.

[ivconic]

Once Trumpet is seated in the chair... I will call him personally (we are good friends, we used to roast the same chicks in our time) and I will ask him to finally solve this issue regarding the procurement of materials!
This took on too much momentum, it exceeded all measure! Can't take this anymore!

[ivconic]

Carl... I just tried to find where to buy PIC16F18426... you won't believe it is not even on Aliexpress or Temu!???
Not to mention the local shops in the region! One has only the SMD version. Phew!
Carl where on earth did you find it! (rhetorical question)
You and the others from the AMX thread are top artists in finding literally all the components that I (and the rest of the "eastern part") can't find!
I have no choice but to port the code to some of the AVRs available to me.

[Carl-NC]

Yes, I'm also interested in this design, it would be nice if Carl posted a lay file or a Gerber file or a picture of the board...

I'm working on this now. Give me a couple of days to finalize.

[ivconic]

Yes, there were similar suggestions on the AMX thread.
But in my opinion, that would be a failure and a deviation from the concept and idea around which the book itself was written.
Carl seems to have followed the reactions of most members on the forum very carefully over the years and understood what the majority needed.
And in that spirit he wrote the book. Which, in my opinion, makes it even more valuable.
He used in most cases "old" components, which are everywhere and easy to get for anyone in any part of the world.
Specifically with this example of bipolar PI; he used 9640 and 740, mostly all chips are very easily available and everything makes the whole project even more interesting.
Of course, all this could have been done in a more "modern" way with new ultra-small SMD components and top-of-the-line specifications.
But that would turn off the vast majority of people, me in the first place!
I often refer to AMX, which I think is a fantastic project. But for exactly the same reasons I left the subject and I don't believe I will ever make one or do anything about it.
Because in some parts of the world (specifically, here, too) it is practically impossible ... or prohibitively expensive, to get most of the components.
Not to mention the working conditions and the impossibility of working with such small SMD components.
The good old "through-hole" way with DIL sockets; gives unprecedented freedom in further work and experimentation.
Of course, the performances between one approach and the other are clearly different and mostly go in favor of the "modern" SMD approach.
But here we are not talking about professional industry and production for wide markets. We have gathered here for hobbies and learning.
And for that purpose, the "classic" approach is second to none.
I believe that hardly 5% of the forum members have the approximate conditions to work easily with the top technology.
All the better for them, because what works well in the "classic" way - will work even better and easier in the "modern" way.
For this purpose, I think it is better to come up with a bipolar driver with discrete components instead of using some specialized chip.
And the understanding of the principles of work will be more complete.
In the specific case, I think it would be best to come up with such a driver with mosfets or BJT transistors.