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Making a BD139 voltage follower buffer, need a little help - Page 8

post #106 of 107
3/27/11 at 9:06pm
Quote:
Originally Posted by diditmyself View Post




 


I just built this amp based on this schematic with a +/- 15v supply. I was getting 200-300mV offset after building it. I swapped the opamp and it because 2v, so I swapped back and still 2v! DO'h! It's bedtime now but when I get up tomorrow I hope someone has some pointers.

 

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post #107 of 107
3/28/11 at 1:38pm

Well I Changed R2 to 470k and R11 to 220 ohm, addeda 47uf cap across the +/- voltage point (Power supply is separate), and all seems well!

 

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