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

Testing a mosfet preamp help please
Testing a mosfet preamp help please
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Old 19th September 2018, 09:19 PM   #11
Cintronic is offline Cintronic  United Kingdom
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Join Date: Dec 2014
Location: London
Quote:
Originally Posted by PRR View Post
Much better schematic at DIY Audio Projects Forum.

Did you get as far as measuring for +14.8V at the point indicated?

It is possible the 4.48V-5.6V bias trim is not wide enough for "all" things sold as IRF*10. If you post the voltages you observe, we may suggest alternate bias resistors to dial it in.
I am sure I did, it seems so long ago I can't remember details. I do have to replace a zener diode as I thought maybe I put power cap in wrong way so changed it and instantly one of them blew. So i had put cap the correct way in the first place.
If i get the chance I will get it going the weekend to check what values I get.
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Old 19th September 2018, 09:29 PM   #12
Cintronic is offline Cintronic  United Kingdom
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Join Date: Dec 2014
Location: London
P1040273.jpgHeres the finished PCB
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