Two TL072s and an IRS2184S
The outer ICs are IR21844S/IRS21844S.
The center may be an LM219 (wait for confirmation, this may not even be close).
The outer ICs are IR21844S/IRS21844S.
The center may be an LM219 (wait for confirmation, this may not even be close).
Good luck with that!
This is typical of chinese manufacturing, and its been done on many products.
Destroying part numbers on IC chips so that they can't be identified.
Now, you ask yourself, why would they go to such lengths to do such a thing?
A simple answer - to hide something, perhaps illegal (copyright infringement?), and to thwart repairs, also making the consumer buy another piece of chinese garbage. - it keeps the cash flowing into their pockets.
This sneaky, shady, and utterly disgusting way of manufacturing products needs to stop.
I've seen it now for the past several decades in TV sets, CD players, audio equipment, you name it.
I don't even bother with repairs on things like that - I'd toss it in the trash and get something decent.
This is typical of chinese manufacturing, and its been done on many products.
Destroying part numbers on IC chips so that they can't be identified.
Now, you ask yourself, why would they go to such lengths to do such a thing?
A simple answer - to hide something, perhaps illegal (copyright infringement?), and to thwart repairs, also making the consumer buy another piece of chinese garbage. - it keeps the cash flowing into their pockets.
This sneaky, shady, and utterly disgusting way of manufacturing products needs to stop.
I've seen it now for the past several decades in TV sets, CD players, audio equipment, you name it.
I don't even bother with repairs on things like that - I'd toss it in the trash and get something decent.
Virtually every large car amp uses the IR21844 IC. IF you need real power abouve about 2KW, you don't have many options.
These amps are decent but can be difficult to make reliable after they fail, generally due to intermittent problems and that's mostly intermittent shorts in the inductors.
If you think this is sneaky, you haven't seen the ICs that are marked with legitimate part numbers that are for a different IC. The marking look 100% legit, not a re-mark like NTE or other IC markings where they black the original marks out and re-print. They even mix up the IC manufacturer for markings. They include original logos and date codes. They do it on ICs and other smaller semis. It's pointless, for the most part.
These amps are decent but can be difficult to make reliable after they fail, generally due to intermittent problems and that's mostly intermittent shorts in the inductors.
If you think this is sneaky, you haven't seen the ICs that are marked with legitimate part numbers that are for a different IC. The marking look 100% legit, not a re-mark like NTE or other IC markings where they black the original marks out and re-print. They even mix up the IC manufacturer for markings. They include original logos and date codes. They do it on ICs and other smaller semis. It's pointless, for the most part.
As a long time servicer for decades, oh, I'm well aware of counterfeit parts.
Even the vacuum tube industry is laden with fakes.
And pray tell, where does it all seem to stem from?
China.
does the ir21844s come in a 16 pin package? the 2 outer ic's have 16 pins on them.
My mistake. I don't know what they are. Look up the pin configurations for the various 16 pin driver ICs and see what matches. Do the same for the LM319 to see if it matches the center IC.