The discussion has moved far from my question:
I received an answer that I think I misunderstood:At the beginning I have to say that I am a noob. My English is also poor, but google translate helps me
I read the thread but for the above reasons I have no knowledge and skills to do what I planned.
I need help to adapt the CEN to the DAC TDA1541A.
I saw several solutions (e.g. D1) and now I use an analog stage on opamps.
I know that I need to compensate offset on I-out in the TDA with potentiometers.
The DAC I have has the option of mounting pull-up(bias) resistors (R25, R33 in the picture) 2k5 which "inject" 2mA to these outputs. After using them I had a 30mV offset. It's not good as far as I understand. Could someone show me a solution that will work and adjust the CEN to the TDA1541 DAC?
Thanks a lot
as I understand now: CEN IV is not suitable for TDA1541A
Yes, this long-standing thread has clearly taken its toll.
darrr, it can be adapted to TDA1541. Patrick is simply pointing you to a circuit more suitable to someone who does not understand how.
My mind is confused.
There are many different circuits for the tda 1541. I wanted to try CEN IV no another one. Because it can be easily built on a prototype board, because I can test it from a battery supply , because I have a spare Jfet quad, because I wanted to compare it with the IV on the opamp and with the D1 IV.
So my question "Can this circuit be used as IV to tda 1541?" I understood Patrick's answer: "use the right side of the diagram". Well, I used it as much as I can. Now I do not know if someone used CEN to tda1541? Is it possible theoretically but nobody did it?
Following Patryk's advice, I give it up as it exceeds my level
Thanks for all for help
Darek
There are many different circuits for the tda 1541. I wanted to try CEN IV no another one. Because it can be easily built on a prototype board, because I can test it from a battery supply , because I have a spare Jfet quad, because I wanted to compare it with the IV on the opamp and with the D1 IV.
So my question "Can this circuit be used as IV to tda 1541?" I understood Patrick's answer: "use the right side of the diagram". Well, I used it as much as I can. Now I do not know if someone used CEN to tda1541? Is it possible theoretically but nobody did it?
Following Patryk's advice, I give it up as it exceeds my level
Thanks for all for help
Darek
> I give it up as it exceeds my level.
Wise decision.
If you want something discrete to compare to the D1, consider Pedja's.
https://www.diyaudio.com/archive/bl...-out-production-pedja-rogic-ddnf-iv-stage.pdf
Fixed rails, easily obtained parts, simple circuit, can be built P2P, full schematics for TDA1541, designed by a reputable audio engineer.
What more do you want ?
Patrick
Wise decision.
If you want something discrete to compare to the D1, consider Pedja's.
https://www.diyaudio.com/archive/bl...-out-production-pedja-rogic-ddnf-iv-stage.pdf
Fixed rails, easily obtained parts, simple circuit, can be built P2P, full schematics for TDA1541, designed by a reputable audio engineer.
What more do you want ?
Patrick
... avoiding sorting out hassle with the parts . This same engineer made a circuitry that works fine in all his tda1541 converters with the opa861... though a quiet ground by a clean layout is needed. With triming to avoid dc blocking cap as well... can be seen at Audial web site. Or here if you dig...ad1862 thread.
. This same engineer made a circuitry that works fine in all his tda1541 converters with the opa861... though a quiet ground by a clean layout is needed. With triming to avoid dc blocking cap as well... can be seen at Audial web site. Or here if you dig...ad1862 thread.
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Granted I've not read the entire thread, but has anyone built the SEN I/V using BF862's?
I did a quick sim(not very good at LTSpice) adding 100R to the gates of the two fets going to GND.
Simulation looks promising, but then I'm not very good at simulation software.
I did a quick sim(not very good at LTSpice) adding 100R to the gates of the two fets going to GND.
Simulation looks promising, but then I'm not very good at simulation software.
Attachments
I take your word for it as you are well above my skill level.
It was more a experiment, many do sudoku or crossword puzzles....me, I relax doing simulations and PCB layouts.
Jonas