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Cheap Raal Direct Drive Amp

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Well cheap compared to all the monster amps out there So correctly done, one would do the Uberamp2-Raal edition, which results in something really big,heavy and lot of heat. And a custom and lar

RAALstar v0.1 with one of Ray's old test discs raalstar.mov

Milled a second board today and after some struggling I eventually have a stereo opamp driver.    Now I listen to this    and this… Grüner Veltliner for my father-in-law... he was

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5 minutes ago, kevin gilmore said:

wire the headphone grounds directly to the amp boards, not the power supply

Thanks Kevin. That is what I have done.

I have balanced inputs so the signal/chassis ground is isolated from the smps and amp board grounds. In other words the smps power ground and output signal negative is floating and not tied down.

I probably need to do a bit more experiments to try and identify the issue I.e. whether it is conducted noise from the SMPS, EMI pick up, earth loop etc.

I was just wondering whether there was some standard EMI suppression filter required with SMPS?

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