If its just relays, you can just add say a 5 ohm resistor on the output. measure the voltage with the relays pulled in, load/no load voltage will vary a lot...
Or, if its DC, reduce the filter cap a lot, you don't need filtering for relays, and the size of the cap has a big impact on the loaded voltage you get out. Or, add choke input, Or, half wave rectify the thing, gives half the voltage output (use a big cap), 8 and 18 volts may pull the relays in fine. The three term regulators are mostly good for 1.5 amps, there are adjustable ones and fixed ones, I don't think the fixed ones have any additional parts...input, output, ground? Brett N2DTS > > This last week I built a 12 volt and 24 volt power supply in > one small box > to power various relays around the shack. > > Well, the 12 volt turned out to be 16 volts, and the 24 volt > is 36 volts. > Even loaded the voltage is high. > > I've done quite a bit of Googling on the subject of > three-terminal voltage > regulators, but have found nothing that had actual component > values that > would be pertinent to my needs. > > Also saw a three-terminal using a pass-transistor. Again, no actual > component values. > > I'd like to be able to get the voltages down to more nearly > what I need so > that I don't burn out a relay. Perhaps 14 volts and 26 to 28 > volts, at an > amp or so. > > My knowledge of solid-state devices is close to zero. > > Anyone have some ideas? > > 73, Barrie, W7ALW > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb >
