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A HiFi Preamp

2018-01-20 16:51  
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A HiFi Preamp

 

A HiFi Preamp

 


The PGA2310 is a pretty neat chip. It's capable of attenuating a stereo source over a 127dB range (-95.5dB to 31.5dB) with 0.5dB steps. It has a maximum gain error of /-0.05dB, and THD of 0.0004% at 1KHz. The sweet spot between THD and noise appears to be between 3V RMS and about 8V RMS. I thus put 6dB gain in the input buffer (an OPA2134), so that the full-scale input is around 4V RMS with my CD player (2V RMS full-scale output). I used signal relays to select the inputs. If I was doing it over, I'd probably use some Analog Devices SSM2404 FET switches. However, at the time I laid it out I didn't know about the SSM2404, so the relays will have to suffice.


A HiFi Preamp



A HiFi Preamp

A HiFi Preamp

A HiFi Preamp

A HiFi Preamp






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