[Amps] Voltage Doubler Regulation

[Fuqua, Bill L]

You know, I have done that. Got an 1kW AM transmitter and a freind that maintains AM stations in Nashville told me that he could not a off the shelf modulation transformer and choke for a Collins, if I recall correctly,  he was working on and mine was a near perfect match. Since both were a pair of 4-400A s modulated by another pair.
Got my money back and still had a nice cabinet, large coils, tuning capacitors and power supply and a few good 4-400A tubes.
73
Bill wa4lav

________________________________________
From: Carl [km1h at jeremy.mv.com]
Sent: Monday, June 13, 2011 12:18 PM
To: Fuqua, Bill L; amps at contesting.com
Subject: Re: [Amps] Voltage Doubler Regulation

You can buy a complete 1000-2500W AM/FM BC transmitter for less than a new
Dahl transformer to run a 1500W PD tube.

Then salvage the PS and all you need is space to mount it in which could be
an average 3' high rack cabinet. Sell the remainder and recoup your cost.

Carl
KM1H

----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: <garyschafer at comcast.net>; "'Mike'" <hinrgdj at centurylink.net>; "'Richard
Solomon'" <dickw1ksz at gmail.com>; <amps at contesting.com>
Sent: Monday, June 13, 2011 12:36 AM
Subject: Re: [Amps] Voltage Doubler Regulation


> It is like this. You do the best you can with the parts you can afford or
> find.
> There is no perfect solution or answer. Some power supplies sag more that
> others
> due to the transformer and many times due to the house wireing.
>   If you must have a power supply that does not sag so much and not have
> some sort
> of complex active regulation, you need to go to choke input filter and
> full wave rectifier.
> Start with an old powersuppy from an AM transmitter. It will be large,
> bulky, heavy and
> costly.
> 73
> Bill wa4lav
>
> ________________________________________
> From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf
> Of Gary Schafer [garyschafer at comcast.net]
> Sent: Sunday, June 12, 2011 11:41 PM
> To: 'Mike'; 'Richard Solomon'; amps at contesting.com
> Subject: Re: [Amps] Voltage Doubler Regulation
>
> This circuit was referred to on here a few years ago. It will buy you
> nothing as far as regulation. It will have poorer regulation than a
> standard
> full wave doubler. Of course you can increase the value of the output
> capacitor and improve it but you can also do that with a standard full
> wave
> doubler.
>
> Look at the circuit closely. It is two half wave doublers feeding an
> output
> capacitor.
>
> 73
> Gary  K4FMX
>
>> -----Original Message-----
>> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
>> On Behalf Of Mike
>> Sent: Sunday, June 12, 2011 5:26 PM
>> To: 'Richard Solomon'; amps at contesting.com
>> Subject: Re: [Amps] Voltage Doubler Regulation
>>
>> Richard, take a look at this web page figure 2. It takes more diode
>> strings
>> but gives very good
>> performance over what the standard handbook FWD circuits we've been
>> accustomed too! Use 6a10 diodes
>> from mouser...cheap... http://208.190.133.201/lit/4x8/index.html
>>
>> Take note C4 is critical for best regulation and it only takes ~10-
>> 20ufd. An
>> oil filled cap
>> or one of the russian poly hv caps listed on ebay works fb.
>>
>> The lower the sec R of the high V transformer the better, very
>> important! A
>> boat anchor tranny with 50 ohm
>> Secondary will not work well ;-))
>>
>> Hope this helps!
>>
>> Mike, K4EAR
>>
>> -----Original Message-----
>> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
>> On
>> Behalf Of Richard Solomon
>> Sent: Sunday, June 12, 2011 2:12 PM
>> To: amps at contesting.com
>> Subject: [Amps] Voltage Doubler Regulation
>>
>> I would like to look at ways to improve the Voltage Regulation in a
>> Voltage
>> Doubler Circuit.
>> I tried Google, but didn't get much on the actual calculations involved.
>>
>> Since we have certain givens; such as The AC Line is what it is, the
>> Plate
>> Xfmr is what it is, the only variable in the equation would be the
>> Capacitor
>> value. Am I correct in that assumption ?
>>
>> Can anyone point me to a reference that I can use ?
>>
>> Thanks, Dick, W1KSZ
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