mouser or digikey
are good sources. you have to search for .0033uF though. that's the trouble i found. some are listed as 3.3nF. some are 3300pf and some are .0033uF. there are 1% values stocked of the 10nF, but the 3.3nF you have to get 2% ones, and hand match them. it is pretty easy w/ a decent hand-held dvm that reads capacitance. the absolute value might not be on, but you should be able to get closely matched pairs. i bought 10 caps, and matched out pairs rather easily. not sure which brands were which...but if you search mouser for the .0033uF 2% you should find them. same w/ .01uF and 1%.
hope this helps. i'm actually building another of richard's designs that uses the same cap values
are good sources. you have to search for .0033uF though. that's the trouble i found. some are listed as 3.3nF. some are 3300pf and some are .0033uF. there are 1% values stocked of the 10nF, but the 3.3nF you have to get 2% ones, and hand match them. it is pretty easy w/ a decent hand-held dvm that reads capacitance. the absolute value might not be on, but you should be able to get closely matched pairs. i bought 10 caps, and matched out pairs rather easily. not sure which brands were which...but if you search mouser for the .0033uF 2% you should find them. same w/ .01uF and 1%.
hope this helps. i'm actually building another of richard's designs that uses the same cap values
ahhhh, thank you!
Is this OK?
Mouser Part #: 140-PF2A332F Page 508
Mfr. Part #: 140-PF2A332F Data Sheet
Mfr: Xicon
Category: Polyester Film Capacitors
Description: Xicon 2% Radial Polyester Film Capacitors CAP 100V .0033uF
I know he calls for polypropylene...
The other cap is:
Mouser Part #: 594-2222-460-41003
Mfr. Part #: 222246041003
Mfr: Vishay/BC Components
Category: Film Capacitors
Description: Vishay/BC Components Film Capacitors .01UF 63V 1%
Is this OK?
Mouser Part #: 140-PF2A332F Page 508
Mfr. Part #: 140-PF2A332F Data Sheet
Mfr: Xicon
Category: Polyester Film Capacitors
Description: Xicon 2% Radial Polyester Film Capacitors CAP 100V .0033uF
I know he calls for polypropylene...
The other cap is:
Mouser Part #: 594-2222-460-41003
Mfr. Part #: 222246041003
Mfr: Vishay/BC Components
Category: Film Capacitors
Description: Vishay/BC Components Film Capacitors .01UF 63V 1%
those are the exact ones i bought. i bought a number of different kinds, and think i got some from digikey as well. i went to check the amp...and i ended up using some 400v jobbers from bc components. might be that they were polypropolene, and the others were polyester. sorry...can't remember as it has been a while. maybe check digikey too. they might have been lower tolerance, but as i said...i matched them here. they were cheap enough that buying 10 didn't break the bank
these are the ones i ended up using:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=246563&Row=220568&Site=US
and
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=246908&Row=220756&Site=US
any of these (or the ones you found at mouser) would work though. if you want to keep them polypropolene...go with these two.
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=246563&Row=220568&Site=US
and
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=246908&Row=220756&Site=US
any of these (or the ones you found at mouser) would work though. if you want to keep them polypropolene...go with these two.
want to build one for me and I'll pay you?
I found a circuit very similar to RJM's at the Analog Devices website.
http://www.analog.com/UploadedFiles/Application_Notes/28080533AN106.pdf
It's at page 9 of this pdf file. Anyone ever tried this?
http://www.analog.com/UploadedFiles/Application_Notes/28080533AN106.pdf
It's at page 9 of this pdf file. Anyone ever tried this?
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