El Cheapo, builders thread

[Old Big]

I used the 510 ohm resistors instead of the 1k.
Mouser or Digikey didn't have any in stock at the time I ordered and or out now.
America better wake up!

 

[tikiroo]

The fact that you are getting a voltage drop across those 510 ohm resistors is an indication that the mosfets are suspect. There should be no gate current. When I first built one of these I had a similar problem, likely due to poor handling and static discharge. Replacing the suspect mosfet fixed the problem.

And echoing Huggygoods's question from last month - What's up with Eli?? His last post here was October last year, similar for Audio Asylum.

 

[Jeff Yourison]

I wrote Eli a few months ago. He has been exceptionally busy with family matters. I didn't get details. My guess is that he won't be back online for a while, if at all. Regarding these MOSFETs, I have blown several, and now use 15V half-watt Zeners across source and gate. So far, so good.

 

[Old Big]

Thank you JCAlverez, tikiroo and Jeff Yourison.
It was the mosfets.
Eli will be missed if he doesn't return. I wish him the best.
Do any of y'all use heat sinks on the mosfets in a el cheapo build?

 

[Old Big]

Sounds good and the numbers are really good.
12at7 followed by 12aq5!!!

 

[huggygood]

I wrote Eli a few months ago. He has been exceptionally busy with family matters. I didn't get details. My guess is that he won't be back online for a while, if at all. Regarding these MOSFETs, I have blown several, and now use 15V half-watt Zeners across source and gate. So far, so good.

Thanks for the news about Eli