[HomeBrew] Full wave rectifying a 5v winding

[km1h]

Been away so excuse the late reply. If that 5V winding is center tapped it 
will be simple to get your 6.3V as the full winding is 10V.
Use a FW bridge, about 1000mF of filter and a 3 terminal regulator or even a 
5W Zener. Ive used this method many times over the years with no problems. 
Use a VOM or scope to check if the voltage is stable or if excessive ripple 
is present. Add more C only if required. Read the ARRL Handbook for more 
details on using various regulators.

Carl
KM1H



----- Original Message ----- 
From: "Steven Weber" <kd1jv at moose.ncia.net>
To: <homebrew at mailman.qth.net>
Sent: Saturday, January 14, 2006 12:51 PM
Subject: Re: [HomeBrew] Full wave rectifying a 5v winding


> ** Please do NOT cross-post messages when posting to HOMEBREW **
>
> Wait a minute! Rectifiying the 5 volt winding isn't going to change
> anything, except give you less voltage due to the diode drops and ripple 
> on
> the cap. What you'd want is a voltage doubler rectifier circuit - but this
> will give you too much voltage, though thats a little easier to deal with
> than too little.
>
> However, I suspect running the 6 volt filments on 5 volts will work just
> fine - and give longer filment life. Also, the fairly light loading of 
> just
> two tubes on the filment winding, plus the higher average line voltage we
> have today compared to when the transformer was made, might give you a
> filment voltage closer to 6 volts anyway.
>
>
>>> I don't have a 6.3 VAC winding on a nice 310-0-310 VAC 150 mA 
>>> transformer.
>>> But I do have a 5 VAC 2A winding. I would like to "boost" this up to a
> 72,
> Steve, KD1JV
> "Melt Solder"
> White Mountains of New Hampshire
> http://www.qsl.net/kd1jv/
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