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Old 20th December 2012, 07:59 PM   #1
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Default Direct substitute for 2SD438 with 2SC1571?

Im unable to find the 2SD438 locally but I can get 2SC1571 ? This will be at bias ckt http://www.elisanet.fi/ch/lme49811.png
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Old 21st December 2012, 01:12 AM   #2
jaycee is offline jaycee  United Kingdom
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You can use pretty much any device here. MJE340 would work well. It has to be mounted to the same heatsink as the output FETs, so a TO-126 device would actually work better than the TO-92 device specified there. You may find that you need to adjust Rb1 to suit - ideally this should be a trimpot anyway.
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