[Boatanchors] Transformers and Chokes Source

[J. Forster]

The ripple from a half-wave rectifier is much greater, so you need a lot
more filtering than with a full wave rectifier. The cost of three more
diodes for a FW bridge is likely far less than a bigger filter cap. Half
wave rectifiers are sloppy design anyway.

-John

==================

> Cuz the voltage output is the same as a half wave and you are not using
> much
> current from the transformer so the half wave single diode is the least
> expensive way to do it.
> 73's
> Greg
> WA7LYO
> Kinston NC
> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "Glen Zook" <gzook at yahoo.com>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Thursday, October 08, 2009 12:19 PM
> Subject: Re: [Boatanchors] Transformers and Chokes Source
>
>
> Why a half wave rectifier? Why not a full wave bridge?
>
> -John
>
> ==============
>
>
>> Go to Radio Shack and purchase 2 6.3 volt filament transformers.  Hook
>> the
>> primary of 1 to the AC line.  Then hook the filament windings together
>> and
>> run the heater ("filament") of the 6AU6 from this junction.  Finally,
>> use
>> a half-wave rectifier from the "other" primary winding for the B+.
>>
>> I have done this many times over the years when I needed about 150 VDC.
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>> --- On Thu, 10/8/09, Lee Buller <k0wa at swbell.net> wrote:
>>
>> I need to build a power supply for a VFO - like a VF-1. I have not done
>> this in years, although I remember how. My junk drawer is not heavy with
>> transformers and chokes. No pun intended. Where do you find these things
>> easily... Ebay? Antique Electronics? Suplus Sales of Nebraska?