00940
Headphoneus Supremus
- Joined
- Nov 6, 2002
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Ok, here's for comments a small (8cm/5cm) I/V stage. It's optimized for the PCM1794/8. It's a simplified/cheaper version of what I'm currently using.
I/V opamps are opa1632. A buffered trimmer set the input voltage at 0V. No caps in // because the opa1632 is apparently sensitive to capacitive loading.
Balanced to unbalanced and analog filtering is pretty much straight from the PCM1798 datasheet.
The power supply is a pair of simple shunt regulators. CCs transistors are bc337-327 or any 600mw to92, shunt transistors are bd139-140. Input should be +/- 10V, output +/-7V. +/-7V shouldn't make the opa1632 too hot.
The board has been drawn with wide tracks, large pads and easy tolerances. V+ and ground are on top, V- and signal tracks on bottom. It should be possible to do it at home. Current input at the right, output in the middle, power input at the left.
I/V opamps are opa1632. A buffered trimmer set the input voltage at 0V. No caps in // because the opa1632 is apparently sensitive to capacitive loading.
Balanced to unbalanced and analog filtering is pretty much straight from the PCM1798 datasheet.
The power supply is a pair of simple shunt regulators. CCs transistors are bc337-327 or any 600mw to92, shunt transistors are bd139-140. Input should be +/- 10V, output +/-7V. +/-7V shouldn't make the opa1632 too hot.
The board has been drawn with wide tracks, large pads and easy tolerances. V+ and ground are on top, V- and signal tracks on bottom. It should be possible to do it at home. Current input at the right, output in the middle, power input at the left.