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Each one of the devices must counter the amateur electronics store , an adjustable voltage direct current power source. I gave the circuit diagram below 1 volt and 40 -volt power supply, the output can be adjusted arasınada as miliamperle 5 amp maximum current is adjustable from 50 . 1-40 V, 50 mA - 5A Regulated Power Supply Circuit Diagram  In this way could be used for voltage source can also be used as a constant current source . Adjustable current limiting , since it is clear that the short-circuit protected . In this phase, on my testing of other circuits , and calibrations can be used successfully in conjunction with a digital voltmeter . Circuit held four transistors . Network isolation transformer , 220V primary and secondary of the power of 35 to 40 volts and 100 VA transformer should be . KBPC601 as a diode bridge ( 6A - 100V ) is sufficient. 4 6- amps instead of the bridge diode aperajlı or higher can also be used . Half- bridge diode and 2N3005 power transitörü do KBPC6...

Quickly find a reliable and cost effective a simple regulated 12 Volt power supply  Notes: This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Approximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zen-er circuit .  

This is a Simple Regulated 12 Volt Supply circuit Diagram. Quickly find a reliable and cost effective a simple regulated 12 Volt power supply  Regulated 12 Volt Supply circuit Diagram Notes: This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Approximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zen-er circuit .