[Collins] 516F-2 CR1 and all caps replaced today

[Gerald]

On Fri, 2005-07-08 at 21:46 -0400, Cam and Juli Hedrick wrote:
> R7 is still frying every time.  I check all of the resistors and caps.  AC
> line voltage is 120vac and 60Hz on the scope.  I replaced CR1 with a 1n4007
> and the cathode band is facing away from R7.  Is that the wrong way?  I
> understand that the current flow in a diode symbol points towards the band
> and that is current flow.  Am I correct?  For some reason I am doubting that
> I got it right and may need to reverse CR1.
> Thanks again for all help in advance.
> Cam Hedrick
> WA4JKW
> 
Your 1N4007 is wired backwards. That's damaging to the electrolytics.
They don't take reversed voltage well and will draw lots of current. My
schematic shows the cathode towards R7 which it has to be to produce a
negative output. You probably need NEW electrolytics again.

The selenium already did them no good.


-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer