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BJT line buffer
BJT line buffer
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Old 30th March 2004, 12:33 PM   #1
hjelm is offline hjelm  Sweden
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Join Date: Nov 2003
Location: Västerås
Default BJT line buffer

I thought i would contribute with my suggestion for a line buffer which at least according to simulation, yes i know don't trust it, looks good.
I was searching for a bipolar line buffer to use as a buffer for a CD player which was inexpensive to build and fit into the CD player without a new PSU.

The CD player had a +-10v PSU for the OP.

According to Kuei the only way to get the DAC, PCM 1716, i have to sound good is to couple it directly from the vout, via a DC blocking cap, to the preamp.

The DAC can take a 5k load but i thought i would create a buffer and buffer the DAC output, this would also enable me to load the DAC with a CCS to bias it into class A.

The design is taken from here and there and i had previous versions which included CFP's on the outputs but those were discarded since i couldn't get the distortion down enough, simulation problems?
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