My Light Diagram

This is low voltage high-current ouput , switching dc power supplly wiht input 220 Volts AC , In this circuit , an St2 diac relaxation oscilator, Q3 , C1 , and the diac , initiates conduction of the output switching transistor Q1, the on time of which is maintained constant by a separate timing / commutation network consisting of Q2 , C2 ,SUS , and SCR 1. See schmeatic diagram below : The output voltage , consequently , is independent on the duty cycle . To compensate for unwanted variations of output voltage because of input voltage or load resistance fluctuations , an H11C wired as a liniear - model unilateral pnp transistor in a stable different amplifier configuration is connected into the galvanically isolated negative- feedback loop.

L4962 is a monolithic step-down  switching regulator. It provides  output voltage of 5.1V to maxi-mum 40V, delivering current up to  1.2A to 1.5A, depending on the type  and package. The theoretical internal  functions are almost the same. The  heart  of  the  device  is  the  regulation  loop  consisting  of  a  saw  tooth  oscillator, error amplifier, comparator and  source-sink output stage. Monolithic Step-Down Switching Regulator Circuit diagram :  Fig. 1: Circuit of switching regulator An error signal is produced by  comparing  the  output  voltage  with  a precise 5.1 volt on chip reference  (which is zener zap trimmed to ±2  per cent). This error signal is then  compared  with  the  saw  tooth  signal  to generate the fixed frequency pulse  width  modulated  pulses  which  driv...

By using the circuit you do not bother to roll  up a transformer that is used to reduce voltage AC 220V to 7V ,9 V or 12V, etc. When using a large transformer we will find it hard to make transformator. by rolling hundreds or even thousands of times roll. But if you use this circuit a little just enough to roll trafo not to small, and its be relatively small. Part List : R1________________________________680K R2________________________________47K R3________________________________100R R4________________________________1K R5________________________________1R D1,D2,D3,D4,D7,D8,D9,D10__________1N4007 D5,D6_____________________________1N4148 C1________________________________2u2F 400V C2________________________________2n2 C3________________________________47uF 25V C4________________________________10n C5________________________________470uF / 16V Q1________________________________MJE13003 Q2________________________________S8050 This is construction of transformer. For the first toll 22...

Description:  The following circuit shows about Self Switching Power Supply Electronic Circuit Diagram. This circuit based on the 7805 IC. Features: variable output voltage, every 100-ohm increment, output varies from 3.7V to 8.7V, the output voltage increases by 1 volt. Component: Transformer, Switch, Diode, Resistor, Capacitor, Transistor, IC.