[MRCA] PRC-64 Battery Pack - need low power regulator

[Al Klase]

Hi Rich,

Radioshack has LM317 adjustable voltage regulators for $2.29.  You'll 
need to add a pot or a couple of resistors to get the appropriate 
output.  Like the series resistor and similar schemes, one third of the 
power will go to the radio, and two thirds comes out as heat.  However, 
I'm not sure anything more elaborate, like a switching regulator is 
worth the considerable effort.  I think the receiver only draws a few 
mils.  How about 3 AA cells for the RX?

Al

Richard Arland, W3OSS wrote:

>The batteries from ZBattery finally arrived and they are a nice fit for the PRC-64 battery holder. I need to drop one 12V SLA stick output down to 4VDC to supply the receiver. 
>
>Does anyone have a recommendation for an adjustable low power voltage regulator that will provide a 4V regulated DC output from one of the 12V SLA sticks? 
>
>Some folks have used series diodes, zeners, and of course there is the wonderfully quaint dropping resistor. I'd hoped to be able to provide a little more elegent solution to the problem of getting 4V DC for the receiver on the 64. 
>
>Suggestions? 
>
>VY 73
>
>Rich Arland, W3OSS
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-- 
Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/