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Old 26th February 2012, 10:51 AM   #7301
atupi is offline atupi  Romania
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Regarding the two electrolitycs i've seen some shunt versions where you recomended 1000uf but in mine also 100uf. Is 100uf enough ? Would be 470uf let's say, bad ?
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Old 26th February 2012, 11:17 AM   #7302
Salas is offline Salas  Greece
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They aren't exactly the same. 220uF for the one across the trimmer maybe, don't change the output one's value though.
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Old 26th February 2012, 11:28 AM   #7303
atupi is offline atupi  Romania
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This is the schematic that i used for 20V. Should i change something ?
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Old 26th February 2012, 04:34 PM   #7304
Salas is offline Salas  Greece
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C2,C4 quality wise you may. C2 can be 220uf also. 35V parts are sufficient in your case.
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Old 26th February 2012, 04:38 PM   #7305
Siberia is offline Siberia  Lithuania
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Quote:
Originally Posted by vgeorge View Post
With 1n resolution you can' t possibly know what values you have on the riaa capacitors. The first thing I would do is find a way to measure riaa caps with a better accuracy and then change other things.
That calls for a cap meter, doesn't it? Could someone advise a reasonably priced one?
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Old 26th February 2012, 04:45 PM   #7306
Salas is offline Salas  Greece
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Google Tonghui. I have the portable one. Looks like OEM for some B&K and Agilent models.
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Old 26th February 2012, 04:49 PM   #7307
vgeorge is offline vgeorge  Greece
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I use this one TONGHUI DIGITAL HANDHELD LCR/LCZ/LCRZ METER,TH2821B,1K | eBay and I am really happy with it.
I haven' t yet find something as accurate much cheaper. Maybe others can recommend something else.
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Old 26th February 2012, 04:52 PM   #7308
Siberia is offline Siberia  Lithuania
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Google Tonghui.
I will. Thank you Salas and vgeorge.
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Old 26th February 2012, 06:11 PM   #7309
Siberia is offline Siberia  Lithuania
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Originally Posted by vgeorge View Post
I use this one TONGHUI DIGITAL HANDHELD LCR/LCZ/LCRZ METER,TH2821B,1K | eBay and I am really happy with it.
I haven' t yet find something as accurate much cheaper. Maybe others can recommend something else.
Lovely aparatus. Although to justify that sort of expensive I have to think if it will be usable in the future. Recaping 20 years old Spendor XOs? Maybe...

As for this project, an alternative would be ordering matched caps?
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Old 26th February 2012, 06:21 PM   #7310
vgeorge is offline vgeorge  Greece
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I initially bought it to measure crossover inductors. Later found it usable on my njfet riaa.
Matched caps is not enough, you need exact values too.
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