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Old 4th December 2008, 06:23 AM   #11
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Join Date: Aug 2002
Location: Cascais
Originally posted by faxurda
sawp with LME49720 but the pre-amp stay silent.

No immediately obvious reason. It is much faster than the 4580 and PCB layout and PS decoupling may not be up to the task. You may try decoupling caps directly on the pins.

Again, i don't get it: why try to make a silk purse out of something like this? With very little effort you'll build a better phono stage from scratch.
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Old 17th February 2013, 02:14 PM   #12
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Join Date: Nov 2012
For U1/U2 you need a FET input op-amp like AD8620 (w/adapter), OPA2134 or TLE2072A. I tried he OPA2134 and didn't like it either. AD is expensive, TLE cheap, both work. To use the 4562 for U3/U4 you'll need to reduce the +Vb divider resistors by a factor of 10 (same voltage, lower impedance). I added film caps across all the electrolytic filter caps. Specialty film and SILMIC II in the signal paths.
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