A friend has a Niles ZR-4630 that he wants made into independent amplifiers. There are six stereo amplifiers based on the LM3886 IC. I have been reverse engineering it. By default the mute is "on" for the amplifier modules. Here are some pictures of the guts.
This shows the amplifier modules and the power transformer. We could not get the power on by the on off switch so we hot wired power to the transformer.
This is another view of the transformer and amplifiers.
This is a view of the back side of the guts.
So far I have been able to confirm the pins of the amplifiers. There is more to come.
Here is a picture of one of the amplifiers running on the workbench.
Hello. Please VCC? Amp? Thanks
Hello. VCC? Amp? thanks
The power transformer has six windings that are 42 VCT each.
I have a single one of these boards. What kind of transformer do I need? And how do you unmute it? It will drive 4ohm speakers.
You need a transformer with 40 to 42 VCT to power it up. The mute is turned off with a resistor to 5 volts.
Hi Bob. I just wanted to thank you for posting info on the Niles LM3886 modules. I purchased a 'part only ' 12 unit like yours, and based on your help I was able to build a few very nice chip amps with little effort. In particular, it was very helpful on your part to determine the circuit layout for each module, especially the 'mute' resistor. Many thanks for taking the time to document your efforts. Paul
thank for posting the circuit layout on these modules. very nice lm3886 chip amplifiers
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