Hammerhead IC-8 Op-Amp question.

[James]

I was curious if any of the members have a good replacement for IC-8 op amp. Carl mention that a J-Fet op amp has leakage current, and a CMOS type IC would be a better choice. I have TL072's but I would like a part number for a better replacement component. Thank you for the use of the board. Best to all Jim

[kt315]

Jim

a better choice for what? depth? no difference that you set. sorry but you have to learn this sht electronics.
then you will see - there are not so magic you did imagine yourself before and all are so trivially.

[James]

I am sorry but I don't or can't believe what comes from you, I was just looking for a better op-amp mot a dissertation on life. I do have a degree, please do not reply to any of my post. Thank you Jim

[kt315]

ok. last post. better can be 'ideal' opamp, some kinda theoretical opamp on a paper.
but we are living in unideal world and there is not ideal opamp. even more, the ideal opamp
will never be made.

[Carl-NC]

For a simple design like the HH, the integrator amp isn't a limiting factor. The TL072 works as well as anything, is easy to get, and dirt cheap. As you push the rest of the design closer to the bleeding edge, then it might be time to consider a better opamp. Areas for improvement might be lower power, better output swing, faster slew, lower IB (esp if you want to run a much lower frequency), and lower temp drift. But you have a long way to go on the rest of the design before any of this will make a difference.

[kt315]

good class for learning 'precision op amps'. google that.

[James]

Thanks Carl for the info, I reread the Hammerhead article an you mention the CMOS op-amp for IC-8. Thanks for the info, more TL072's on order, I might try a TL082 for just fun. Best to all Jim

[sinclairuser]

tle2072, has lower noise and uses less power, and is pin-pin compatible but as carl said you have work to do to the rest of the circuit before you see any benefit.
though since carl designed it with a learning angle as well as being a good functioning detector your question is valid, if you don't ask you don't get.
aly.