CCS Load for 1541A? - Page 2 - diyAudio
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Old 14th July 2008, 12:58 AM   #11
kevinkr is offline kevinkr  United States
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The key is pin 5.. This is definitely not a recommended approach by the manufacturer of the chip, but it does apparently work.. Someone obviously spent some time figuring this out. Still the commercial applications I have seen using it as an I/V use the conventional transimpedance configuration - for audio I assume the theoretical loss of accuracy is an acceptable trade off for running it open loop. It probably sounds fine, I haven't tried it so I can't say. Seems easier than a fully discrete implementation which is what it emulates. Might be worth trying.

I'm not a fan of the TDA1541 so I don't follow those threads - I may have missed something.

Note that if a vendor decides to clone the AD844 under license down the road or Analog changes internal design details it is possible that this circuit may no longer work with newer chips. Just one of the risks of using a chip in ways not intended by the manufacturer and I've been burned this way... For DIY this probably does not matter.

FWIW this obviously will not work with most op-amps..

I'd say this is pretty clever and I will read the other threads to understand it better.
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