In a message dated 30/11/04 02:01:23 GMT Standard Time, [EMAIL PROTECTED] writes:
What is the absolute highest safe voltage you can pump into the K2 before you start overheating the regulators etc? Most manufacturers seem to give 16V as the upper sustained voltage limit for DC input on 12V equipment. The 2SC1969 PA transistors are rated at this in their data sheets and the regulators seem to come out at 25V as their maximum input so should not represent a problem. Faced with the situation you have with 1.2V above the 16V normal limit a string of 1N4000 series 1A diodes could bring down the voltage to what you require. Normal forward voltage drop comes out somewhere near 0.6V per diode, so two in series would probably fit the bill. Used this technique to power a Sony 2001 SW broadcast radio I had in the Middle East for over 20 years needing 4.5VDC power source. Bob, G3VVT _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
