[AMRadio] Liftin center tap to kill B+


Jim Wilhite w5jo at brightok.net
Thu Nov 20 10:41:44 EST 2014


No the circuit is a full wave rectifier as opposed to half wave which 
requires different handling and normally not used in HV circuits for 
transmitters.

Jim
W5JO


-----Original Message----- 

Yeah but Jim says he has a full wave bridge.

anyway, I'd check the voltage at the center tap when it is lifted.
Nothing happens magically.  There as to be a reason the caps blew.

Rob
K5UJ

On Thu, Nov 20, 2014 at 8:19 AM, CL in NC via AMRadio <
amradio at mailman.qth.net> wrote:

> Lifting the CT removes the return path.  That rectified voltage has to get
> back to the xfmr some way, and the CT is it.  An xfmr with no CT but using
> a bridge, the bridge swaps each end of the TX secondary to ground on each
> half cycle, where as a full wave  CT only uses 1/2 the secondary on each
> half cycle.
>
> Charlie W4MEC in NC



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