Doing so reduces any IR drop on power supply wiring by a factor of 2 or 3.
Higher voltage - 24 or 40 V results in decreasing the voltage drop by a factor or 4 or 9. The voltage drop is a function of current *squared*. 24 or 48 volt finals certainly produce much cleaner signals as the active devices are not likely to be driven into current saturation *or* cutoff in order to reach useful power output where the 12V devices are pushed to the wall to make 100W output. 73, ... Joe, W4TV On 10/2/2015 4:12 PM, brian wrote:
Fred, I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA transistors can produce cleaner signals. Doing so reduces any IR drop on power supply wiring by a factor of 2 or 3. KISS. IC's are going to lower and lower voltages. Multiple circuits within boxes require a menagerie of voltages. One is faced with having to generate more heat in regulators dropping 40 volts to 12, maybe 5, 3.3 and 1.6 V. Perhaps the era of efficient multivoltage power supplies with multiple wires for multiple voltages will return. (Remember filament ,plate, screen and grid voltage power supplies in days of yore? Guys generally didn't mistakenly hook up the 3500 V B+ wire to the filaments......) 73 de Brian/K3KO
______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
