Wednesday, June 30, 2010
A simple Circuit using 2X lm3914, a cheap transistor and a relay... and a few other bits. you can set the max charge voltage with a small preset potentiometer, when the set voltage has been reached the lm3914 Lights LED 18 (the first red one) and also sends a small base current to the transistor, which then powers the relay coil and turns the ZVS off. when the voltage drops below the set voltage or the capacitor is discharged the power to the relay coil stops and the charging begins again automatically :-D.The transformer is a core stripped from a flyback transformer, with a hand-wound primary and secondary, approx 4.5+4.5 primary turns and roughly 100 turns on the secondary) oh... and before anyone says anything.... (the ZVS is on the Normally Closed contact on the relay) the whole unit/ module/ circuit draws between 3-6A @ 12VDC. Thanks for watching!
http://www.youtube.com/watch?v=T8MlrguF7Kg&hl=en
