I am trying to repair a Behringer MA400 headphone amplifier which seems to have blown Op-Amps (CoolAudio V4580).
They are SOP-8 package Op-Amps. Could I use any of these ROHM ones:
LM4565
BA2904
BA4580
They are SOP-8 package Op-Amps. Could I use any of these ROHM ones:
LM4565
BA2904
BA4580
These use 4590 chips so almost anything that runs on a very low voltage will do.
I would fit NJM4580E-TE1. The usual cause of failure is incorrect power supply, otherwise they are protected against overload.
https://uk.rs-online.com/web/c/?searchTerm=njm4580
I would fit NJM4580E-TE1. The usual cause of failure is incorrect power supply, otherwise they are protected against overload.
https://uk.rs-online.com/web/c/?searchTerm=njm4580
Did you mean 4580 chips?
Thanks for the suggestion of the Nisshinbo part, the internal transistor layout looks identical to the CoolAudio one.
Hi,
Please check where in diagram that 4580 is. This opamp has one good characteristic to be able to drive very low R loads (down to 100ohm) and Behringer is using that characteristic sometimes.
If its on such place best replace it with new 4580, that's very cheap opamp.
V4580 is NJM4580
Please check where in diagram that 4580 is. This opamp has one good characteristic to be able to drive very low R loads (down to 100ohm) and Behringer is using that characteristic sometimes.
If its on such place best replace it with new 4580, that's very cheap opamp.
V4580 is NJM4580
I think the one specified for heavy loads is the 4556, no?
https://www.mouser.es/ProductDetail/Nisshinbo/NJM4556AV-TE1?qs=GNeTCC5Ivi5%2BsgNOeHlroA==
https://www.mouser.es/ProductDetail/Nisshinbo/NJM4556AV-TE1?qs=GNeTCC5Ivi5%2BsgNOeHlroA==
Yeeeeees, it isssss..... , as is 4580 and many others too..... both capable of direct driving headphones, at least not very difficult ones) Don't really understand the question? Sure there are many heavy load speced opamps, only important thing is not to replace one of them with usual (down to 600ohm or less capable) replacement, and that also only if and when one of those 4580 or 4556's is really driving heavy load as in schematics.
Here is snapshot from Behringer DCX2496, very popular unit:
IC1A is driving 1 kohm when playing, but only 499 ohms when in mute...It can do that without harm as its specified for high output current (as many are) , but try to put there TL071, it will not be a happy chip 🙂. But Behringer is using these Cool audio V4580 and NJM4580 everywhere, in many places it can be replaced with chip that doesn't have great output current capability, so choice is wider but one must check the schematics before