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DIY For Audio
PGA231x Based preamp
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<blockquote data-quote="gbyleveldt" data-source="post: 3101" data-attributes="member: 122"><p>Well, like you stated elsewhere, the OPA637's are a bit tricky when it comes to low gain applications. I basically gave up using them in the pre-amp, as they would burst into oscillation erratically (I'm using the opamps for buffering with no gain, so that I drive the PGA with a lowish impedance, as stated in the datasheets). I'm generally quite happy with the pre-amp, especially the noise performance that is surprisingly low. I think the PGA is the noisiest part of the whole design. That is probably why Mark Levinson uses that fancy discrete resistor ladder arrangement in their pre-amps.</p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 3101, member: 122"] Well, like you stated elsewhere, the OPA637's are a bit tricky when it comes to low gain applications. I basically gave up using them in the pre-amp, as they would burst into oscillation erratically (I'm using the opamps for buffering with no gain, so that I drive the PGA with a lowish impedance, as stated in the datasheets). I'm generally quite happy with the pre-amp, especially the noise performance that is surprisingly low. I think the PGA is the noisiest part of the whole design. That is probably why Mark Levinson uses that fancy discrete resistor ladder arrangement in their pre-amps. [/QUOTE]
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DIY & Tutorials
DIY For Audio
PGA231x Based preamp
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