Wiring Diagram

This is an efficient flyback driver for modern cylindrical rectified television flybacks. Frequency range can be increased using multiposition switch for other values of C3 capacitor, for example 2 nF for 80KHz-200000KHz, but didn't found flybacks with so high resonant frequencies, in addition with higher values of c3 , eg 200nF, 2uF the frequency will drop making possible the use of ignition coils, and rectified power transformers @50Hz to charge high voltage electrolitic caps at 300-400V).

rangkaian driver (penggerak) playback TVSkema rangkaian driver (penggerak) playback TV


The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a 2N3904 and a 2N3906, which are cheap, and easy to find. The totem pole ensures the gate being charged and discharged very fast (approx 50nS). The IRF840 is a cheap reliable and powerful power mosfet, it has current capability of 8 A continuous and 32A pulse, 800V drain source voltage, protecting internal zener diode. There is a snubbing network to ensure that voltage spikes are kept low (unless the insulation of the transformer start to leak) protecting both transistors and 555 IC. 100 ohm is a compromise between decay time and voltage spike.

12VDC FLUORESCENT LAMP DRIVER SCHEMATIC DIAGRAM

Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce much more light for less power consumption. Secondly, their light color stays constant while the battery runs down.

In this article I will offer driver circuit for 12 V/5Watt fluorescent lamp, this circuit used a normal 220 to 10V stepdown transformer in reverse to step 12V to about 240V to drive a lamp without the need to warm the filaments.
Rangkaian 12VDC Fluorescent Lamp DriverSkema Rangkaian 12VDC Fluorescent Lamp Driver

The IC1 TLC 555 is wired as an astable multivibrator for producing the necessary oscillations.The MOSFET Q1 is used to amplify the oscillations produced by the IC1.The out put of MOSFET is connected to the primary of the step up transformer to produce a ~240 V AC for driving the florescent lamp.

List Component:

    * C1 100uf /25V Electrolytic Capacitor
    * C2,C3 100nf Ceramic Capacitor
    * C4 100nf /1KV Ceramic Capacitor
    * R1 1K Resistor
    * R2 2.7K Resistor
    * Q1 IRF510 MOSFET
    * U1 TLC555 Timer IC
    * T1 300mA, 10V/220v Transformer
    * LAMP 5W Fluorescent Lamp
    * MISC Board, Wire, Heatsink For Q1