[ARC5] Power Supply Filter Question
Mike Feher
n4fs at eozinc.com
Sun Dec 22 14:28:21 EST 2013
If I remember right, this is known as the Miller effect. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of J. Forster
Sent: Sunday, December 22, 2013 2:09 PM
To: Ben Hall
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Power Supply Filter Question
It's basically an emitter follower.
The pass traqnsistor's collector goes to the supply; the emitter to the
load.
One version uses a resistor between coll. and base & a capaciytor to ground.
This filters ripple, but does not regulate. It effective capacitance is
roughly beta x cap value.
Another version uses the same resistor position, and one or more zeners in
place of the cap. This regulates the output voltage.
-John
===============
> Hi John and list,
>
> Sounds very interesting. Where can I find information on the Beta-C
> filter?
>
> On 12/21/2013 7:37 PM, J. Forster wrote:
>> A Beta-C filter is relative simple and more than adequate. With a
>> couple of protective diodes, it's just about bulletproof. The version
>> with a Zener will easily add sufficient regulation.
>
> thanks,
> ben
>
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