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Date: Sat, 18 May 2013 21:40:26 +0200

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Quote:

Circuit Project Electronic
Variable zener diode circuit
http://www.eleccircuit.com/variable-zener-diode-circuit/

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Text:

I used to design and calculate the value of the equipment. By false starts. Frequently have all the equipment. Except that the Zener diode can not find what you need. I tried using this way. This circuit features as zener diode voltage can be adjusted. And Zener diode features more than normal, are higher input impedance (20 to 50 ohm) Rate under the maximum load. and there is the temperature coefficient just only about -2 mV per degree celsius. Zener voltage Uz can be adjusted in the 3 to 25 volts. This circuit works. When the voltage at pin T2 base of more than 0.6 volts. T1(?BC547) conduct makes T2(BC557) conduct current according, And the voltage drop across this circuit. It can not be increased, same as a normal zener diode. This voltage zener determined by the ratio of P1/R1 and R2. When adjust the voltage Zener This circuit is [...]

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