Hello, I was thinking if it was possible to replace an OP TL072 with an Opa627 that would have to be modified in this AMP
Sorry for the question but I don't have much knowledge and sorry for my English 🙂
Sorry for the question but I don't have much knowledge and sorry for my English 🙂
The audio chip shown is a 741 not TL072 even so that's a big jump in performance to an OPA627 .
Used it myself but in the design shown you would need a change of compensation capacitors .
Used it myself but in the design shown you would need a change of compensation capacitors .
The LM4562 is an extremely good and relatively cheap audio op-amp with low noise. A NE5532 would work ok too and is a lot better than the obsolete LM741. The TL072 would work but isn't really the best choice unless you need a very input impedance. Just make sure you attach the +/- of the unused op-amp to +V/-V so it doesn't oscillate.
Also, not to plug my own work, but I have complete plans for a 300W amplifier
GitHub - profdc9/PowerAmpAudio: Power Amplifier based on Michael Chua's C300 amplifier
you can check out.
Also, not to plug my own work, but I have complete plans for a 300W amplifier
GitHub - profdc9/PowerAmpAudio: Power Amplifier based on Michael Chua's C300 amplifier
you can check out.
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Put it this way you have a better chance of little or no instability with a NE5532 --D.self,s long term favorite audio chip.
The TL072 is fairly relaxed about high speed decoupling, the OPA627 may not be as stable, I'd add 100nF ceramic between +15V and -15V rails across its supply, up close, and perhaps check for misbehaviour with a 'scope.
The same goes for the NE5532 and NE5534A too BTW, high speed decoupling is needed for full performance.
The same goes for the NE5532 and NE5534A too BTW, high speed decoupling is needed for full performance.
The '741 is a single opamp. The TL072 and '5534 are dual opamps. The pinouts are very different. The unused opamp should be tied-up so it won't make trouble.
It is rare in the schematic it says 741 but in the component position it says TL071 and the manufacturer clarifies that it uses 071
If indeed it uses a TLO71 and not a 741 as shown in the schematic then the manufacturer should have put some notification of a revision or mark number on the amplifier to differentiate between the two .
You must have a later version as the TLO7**** series came out some years after the 741 , in that case you can substitute with another modern standard small signal audio chip.
In other words if you SEE a TLO71 fitted in your amplifier you have a later model but the manufacturer is lax if they have not updated the schematic or stamped an update on the unit somewhere.
You must have a later version as the TLO7**** series came out some years after the 741 , in that case you can substitute with another modern standard small signal audio chip.
In other words if you SEE a TLO71 fitted in your amplifier you have a later model but the manufacturer is lax if they have not updated the schematic or stamped an update on the unit somewhere.
Just for your knowledge, the opa627 is highly sought for and rather expensive, which gets great chance to be fake. If the gain is higher than 3 the identical one is opa637, even in low noise version, I think BE , is very affordable. I bought 10 pieces from Aliexpress in promotion, they are all original.
Aliexpress ---original ?
Can anybody back that up ?
I have originals bought at the time they came out and yes they weren't cheap even from Maplin ( UK) - now long gone.
I have some of the original catalogues the OPA627 was selling for----£15
in 1996---THD+noise= 0.00003 --slew rate a whopping 55V/microsecond--offset laser trimmed =100microvolts.
Be AWARE we are talking original manufacturer --Burr-Brown -not some factory in a Chinese province.
So I bought them before Burr-Brown was taken over by TI .
Can anybody back that up ?
I have originals bought at the time they came out and yes they weren't cheap even from Maplin ( UK) - now long gone.
I have some of the original catalogues the OPA627 was selling for----£15
in 1996---THD+noise= 0.00003 --slew rate a whopping 55V/microsecond--offset laser trimmed =100microvolts.
Be AWARE we are talking original manufacturer --Burr-Brown -not some factory in a Chinese province.
So I bought them before Burr-Brown was taken over by TI .
