6.8 Volt Transformerless Power Supply.

Quite a simple power supply unit can be built for half an hour.
6.8V Transformerless Power Supply
The scheme is designed for voltage and current of 6.8 V 300mA. The voltage can be changed by replacing the Zener D4 and, if necessary, D3. A setting on the radiators of transistors can be increased and the load current.
Diode bridge – any, is nice and a reverse voltage of at least 400 volts. By the way, we can recall the ancient and diode D226B, once terribly popular.

WARNING!
Scheme is not galvanically isolated from the AC, so when its assembly, setup and use, you must be extremely cautious.

Parts list :
R1 : 4K7
R2 : 5K6
R3 : 3K9
C1 : 1000uF/10V
D1 : KU405B
D2 : KC650A
D3 : D817B
D4 : KC168
T1 : KT940A
T2, T3 : KT815
Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


Tags: 6.8 V power supply Transformerless power supply

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  1. author

    Farrukh Naeem5 years ago

    can yo please give the substitue or repacement part number of the following or the data sheets for the same:
    D1 : KU405B
    D2 : KC650A
    D3 : D817B
    D4 : KC168
    T1 : KT940A
    T2, T3 : KT815