Seen in the accompanying schematic, the 555 square wave generator drives an MPF102 FET, which in turn drives a D718 power transistor that provides a “pulsed” 12V variable duty cycle driving the LED ...

In this paper, the driver circuits are proposed for Light Emitting-Diode (LED) lamps with a dimming feature. The two different drivers used are flyback converter and forward converter in series ...

It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter. Electronic Thermometer This digital thermometer ...

It was originally used as a jumbo LED dimmer. The circuit works this way: the A1 opamp functions as a square wave generator. At its non-inverting ... The output of A2 is a square wave signal with a ...

Supertex’s PS30 constant-frequency (67 kHz), constant duty-cycle LED driver provides high power ... Also, proprietary dimming circuits help ensure proper operation with different triac dimmers.