[Amps] Choke input filters, design criteria?

Bill Turner dezrat1242 at yahoo.com
Mon Dec 17 22:35:52 EST 2012


ORIGINAL MESSAGE: 
On Mon, 17 Dec 2012 17:36:26 +0000, Chris wrote:

> I am
>wondering if I should attempt to use it rather than a capacitive input
>filter?

REPLY: 
Choke input filters are a holdover from the old AM transmitter days
when current draw was relatively constant and HV capacitors were
expensive. Today's amps for SSB and CW need a constant voltage source,
not a constant current one. If you use a choke in a power supply where
the current draw varies a lot, you will see the output voltage
swinging widely, just what you do not want. 

Toss the choke. Capacitors only. 

73, Bill W6WRT


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