On 1/12/07, Martin Klingensmith wrote: > > If your solenoid is only activated for 0.2s at a time, then you don't > need a power supply rated for 3 amps. > Use a 24v unregulated wall-wart to power the solenoid with 1000uF > capacitor filtering it. In a similar vein, I used a boost regulator to provide 32V at 19A 300uS pulses for a thermal printer, from an 18V 2A wall wart. It loaded the wall wart at max power, and signalled the CPU when the next burn could happen.. Takes careful selection of the output capacitors. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist