[Amps] switchable zener cathode bias

[Radio WC6W]

Hi Steve,
  Leave the high voltage one in circuit continuously and just switch in the lower voltage part in parallel with it when you need less bias.

73 & Happy New Year!
  Marv WC6W

http://wc6w.50webs.com/


--- On Tue, 12/30/08, Steve Flood <kk7uv at bresnan.net> wrote:

> From: Steve Flood <kk7uv at bresnan.net>
> Subject: [Amps] switchable zener cathode bias
> To: amps at contesting.com, rfamplifiers at yahoogroups.com
> Date: Tuesday, December 30, 2008, 8:53 AM
> Considering the common zener bias circuit (with the 2n3055
> and resistor), what precautions should be taken if I wanted
> two different zeners (and associated bias voltages) selected
> by a switch or relay?   Is there a danger in the moment when
> the switch/relay throw is transferrring from one pole to the
> other and neither zener is in the circuit?   Likewise, if I
> used a make-before-break setup, can the two zeners be in
> parallel for a moment without causing trouble?
> 
> Thanks,
> Steve KK7UV
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