Why? - A Low Power Desktop Amp [LPDA] - diyAudio
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Why? - A Low Power Desktop Amp [LPDA]

Posted 6th April 2013 at 08:34 PM by BuildMeSomething
Updated 26th April 2013 at 10:26 AM by BuildMeSomething

1] I hold opc's "The Wire" series of headphone and power amps in high regard. Small form factor, simple no nonsense designs and killer performance. God bless that man

I'm fortunate enough to have a few pieces at home. Primary, is the SE-SE headphone amp that gets used for both music and late night movies... Also, under construction is the A/B Power Amp, utilising two 55V/45V DPS-600 smps. This should provide over 100 Watt per channel into 8 Ohm load. Nice, but way to powerful for my spare little room.

opc designed a Low Power Ultra High Performance [LPUHP] Amp giving 16 Watt into 8 Ohm @ 1% THD. This was based upon the headphone amps he'd designed, using the same LME49990 opamp, but paralleled 8 LME49600 buffers.

Unfortunately I didn't have the funds to get both the A/B Power Amp and LPUHP Amp. Plumping for the former...

My little spare room is just that... Its 3m[w] x 2.9m[L] x 2.4m[H] and is full of stuff to do with my various hobbies. So a big powerful amp isn't needed to fill this room.

Because of the size and furnishings, a close/nearfield listening position will be ideal. Furthermore, with some fairly sensitive assive studio monitors [=> 90dB 1W/M], a low power amp will be ideal...

So, inspired by "The Wire" LPUHP Amp, I'm laying out [PCB] & building a Low Power Desktop Amp [LPDA]... The A/B Power Amp is to be a longer term project, hopefully with switchable bias settings and some safeguards.
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