I know it's a quick and dirty way to go about it, but after nearly 20 years of operation, I can't complain. Besides, I had the parts in my junk box. Today, I'd go with an LM317. With age comes wisdom. And the money to do it right LOL!
Bill KB1MGH ________________________________ From: "n...@no6b.com" <n...@no6b.com> To: Repeater-Builder@yahoogroups.com Sent: Sat, February 27, 2010 6:25:09 PM Subject: Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement? At 2/25/2010 12:36, you wrote: >Build it yourself. Use an LM7808 and and series two 1N4001's to lift the >ground lead up by 1.4 volts. I know 7809's are around but the 7808 is much >more common and cheaper. One thing to watch out for in lifting the ground pin above ground on the 78xx series devices is that a momentary short of the output to ground can destroy the device, IOW the integral short circuit protection is effectively defeated. You'll also need to use insulating hardware if you want to heat sink the regulator by mounting it to the (grounded) chassis. The cleanest, easiest solution may simply be an LM317 set to 9.6 V output. Bob NO6B ------------------------------------ Yahoo! Groups Links http://docs.yahoo.com/info/terms/
