[Heathkit] SB-303 project.

[Larry Babb]

Following is parts reference from Jameco for 470 uf @ 50 V

Part No. 	Ref. No.† 	(μF) 	Voltage 	DxH 		1
10 		100 		500
11121 	A470/50 	470 	50V 	   13 x 31 		$1.19
$1.07 	$.86 		$.64 

Not sure why Digikey was so high.

Larry N7LB

-----Original Message-----
From: heathkit-bounces at mailman.qth.net [mailto:heathkit-bounces at mailman.qth.
net] On Behalf Of Glen Zook
Sent: Wednesday, December 05, 2007 12:26 PM
To: kiyoinc at attglobal.net; heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB-303 project. 

I get my replacement parts from Mouser

http://www.mouser.com

and their prices are generally about the best around.

Yes, a 470 mfd capacitor is the "new" value for the old 500 mfd capacitors.
Remember that most of the old electrolytic capacitors had a tolerance of
-50% / +80% whereas the new ones generally have a tolerance of
+/-20%.  Therefore, the new ones are going to
generally be much closer in actual value.  Also, the new capacitors are
considerably smaller in physical size.

Glen, K9STH


--- kiyoinc at attglobal.net wrote:

I think the electrolytics all should be replaced, every one of them. It's
not worth testing them because the radio is 35+ years old. It's time. Since
I have other SB-303's, where should I get the electrolytics? 

www.mouser.com has better prices but maybe the problem is how I've specified
the value. 500 ufd's are pricey but 470 ufds are cheap.
 
The search features on both sites are frankly weird.
If I need a 50 V cap, I don't want to specify 50 V because a higher voltage
will work. Ditto capacitance.
If the circuit uses 500 ufd, then 470 is just as good, especially if it's
1/10 the price.









Glen, K9STH

Website:  http://k9sth.com


 
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