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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 6th June 2012, 09:12 PM   #1
diyAudio Member
 
Join Date: Aug 2010
Default PGA2310 based preamp+ remote

Hi,
Got this kit thru ebay (Hong Kong). It works ok per my preliminary tests. I wonder if mods can be tried to improve things. My thoughts
= change PGA2310 to PGA2320 - a bit tricky the soldering
= remove C7 and C8. Will this act as filters?
- replace unknown brands of electrolytic with branded ones.

Also, this comes with a rotary encoder + push button switch. Where can I get a replacement ?

I have attached the schematic.
Attached Files
File Type: pdf PGA_V2.7 schematic.pdf (121.3 KB, 205 views)
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Old 7th June 2012, 08:23 PM   #2
JensH is offline JensH  Denmark
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I would leave C7 and C8 in the circuit. If you remove them you may get EMC problems. If you drive the inputs from a low impedance source the low pass filter will be at more than 700kHz. No problem for audio, but good for attenuating RF.
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Old 8th June 2012, 10:24 AM   #3
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Yes you are right. I remember a P-88 preamp based on 2134 I had built which was producing noise. Ultimately boiled down to the fact that source impedance was low.
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Old 8th June 2012, 09:28 PM   #4
JensH is offline JensH  Denmark
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In this case a low source impedance is not a problem in itself. The lower the impedance, the higher the low pass cut off frequency will be.
If the source impedance becomes very high the low pass cut off frequency will get lower though, but in normal cases that will not be a problem.
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