[Boatanchors] Question,voltage multiplier circuit?

[D C *Mac* Macdonald]

Joe, the 12.6 VAC transformer that feeds the 1625 filaments

also feeds a voltage tripler circuit for the 1625 bias voltage.

It is obvious that the ground return for that power supply

has been omitted in the circuit.

 

Go to page 237 of the same 1962 handbook and check out

Figure 7-29A to see how the circuit SHOULD have been drawn.

 

73 - Mac, K2GKK/5

Oklahoma City, OK



 

> From: w5jdy at intergate.com
> To: boatanchors at mailman.qth.net
> Date: Sat, 2 May 2009 23:11:11 -0500
> Subject: [Boatanchors] Question,voltage multiplier circuit?
> 
> >From Joe w5jdy in Okla. I have a 1962 Radio Amateur Handbook and on page
> 274 in the Modulator Section there is a bias circuit on the lower section of
> the schematic... First I don't see how it could work without some kind of
> chassis ground and also it appears to be sending positive voltage to the
> external bias plug.. There is a good chance I just don't understand the
> circuit... This circuit appears in some later handbooks also... The
> circuit is for "A 50-Watt Class AB1 Modulator" using four 1625's... Joe
>