[NLRS] Wanted: 555 Timer/Voltage Doubler Ckt.

Tue, 11 Mar 2003 00:51:40 cst

An ICL 7660 works in the circuit. They will supply
about 100mA but the voltage will drop to between 
18 and 20V. There is usually enough voltage at turn
on the key the relay, while 18V is enough to hold it keyed.

Bud, if you want to try the circuit let me know. I have a supply
of 7660s.

If you want to try a 555 look in the 1987 Proceedings of the
Mid-Atlantic States VHF Conference. Since the chance of you 
having that is almost zero I can get you a copy if you need one.
The circuit uses a 55 to drive two transistors which switch 12v
to a voltage multiplier. The multiplier uses two 1N4001's and two
50 mfd caps. I've built this and it works. However, the 7660 is
simpler and works just about as well as the 555 circuit.

73, Gary  WB0LJC

Hey Brian, are you interested in going to the UP of Michigan for
the first weekend of the 10Gig Cumulative?

On Mon, 10 Mar 2003 22:58:33 -0600 "BRIAN WADE" <[email protected]> writes:
>Bud,
>
>This may be a little off subject but may possibly work.
>There is a voltage doubler circut in the uhf/microwave projects manual 
>
>volume 1, the article is titled three useful circuits, by rick fogle 
>wa5tny. 
>it uses Siliconix si7661cj square-wave generator as the device.
>It was a little difficult finding those, but I called up dallas maxim
>http://www.maxim-ic.com/ if I rember correctily and they sent me free 
>samples. The rest of the parts were available from radio shack. By the 
>way 
>it is a 12v to 28v doubler. Hope that helps.
>
>Brian
>
>W8HTB
>
>
>
>
>>From: "Bud Patten" <[email protected]>
>>To: "Northern Lights Radio Society Reflector" <[email protected]>
>>Subject: [NLRS] Wanted: 555 Timer/Voltage Doubler Ckt.
>>Date: Mon, 10 Mar 2003 20:16:04 -0600
>>
>>Do any of you have a schematic for a 555 timer configured as a 
>voltage
>>doubler?  If so I'd sure appreciate a copy of the circuit.
>>
>>73,
>>Bud
>>w0lcp
>>
>>
>>Please check out my Web Site:  www.qsl.net\w0lcp
>>and the Northern Lights Radio Society website at:
>>http://nlrs.dropboxone.net/index.htm
>>
>>_______________________________________________
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>
>
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