B-boards line/headphone buffer stage up and running! - diyAudio
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B-boards line/headphone buffer stage up and running!

Posted 26th February 2012 at 12:43 AM by rjm
Updated 1st March 2012 at 02:29 PM by rjm

The B-board line buffer is back from the fab and running on the bench.

Cute little board. Diamond buffer with BD-135/136 transistors and a built in Z-reg. Designed to buffer the output of op amp circuits to help drive cables and otherwise isolate the op amp feedback loop from the big bad outside world. It can also be used as a unity gain preamplifier, or, with by changing a couple of resistors and adding small heatsinks, to drive headphones.

Development thread here.

UPDATE: Also finished a second set of boards, configured as a headphone driver (5x bias current, heatsinks).
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