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@bresnan.net> wrote:
> From: Steve Flood <kk7uv@bresnan.net>
> Subject: [Amps] switchable zener cathode bias
> To: amps@contesting.com, rfamplifiers@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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|