Posted on Jul 23, 2012

Ul is a dual voltage comparator with open collector outputs. The A side is an oscillator operating at 100kHz, and the B side is part of the regulation circuit that compares a fraction of the output voltage to a reference generated by zener diode D2. The output of U1A is applied directly to the gate of Q1. During the positive half-cycle of the Q1 gate voltage, energy is stored in Ll; in the negative half, the energy is discharged into C2.

Click here to download the full size of the above Circuit.

A portion of the output voltage is fed back to U1B to provide regulation. The output voltage is adjustable by changing feedback potentiometer R9. Using the component values shown will produce a nominal 300-V output from a 12-V source. However, the circuit maximum output voltage is limited by RlO; a lower value for R10 yields a higher output voltage. The output voltage is also limited by the breakdown of values Ql, L1, D1, and C2.

Leave Comment

characters left:

New Circuits



Popular Circuits

Active crossover circuit
Bull Horn
Fast Symmetrical Zener Clipper
Mini Audio Mixer circuit
24hr clock using logic ics
Light Dimmer Circuit TRIAC dimmer circuitCircuitWorking
Telephone line monitors
Fluid lever sensor circuit design using ac signal
HQ Notch Filter Without Close-Tolerance components