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Transistor regulator circuit can adjustable output voltage

2016-05-08 09:40  
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This circuit is maintain aconstant voltage, the output voltage is adjustable.Serves to reduce the input voltage, and keep the voltage constant.
The Q12N3904is the amplifier model. common-emitter. This causes the voltage across the collector’s pin with the ground.Is equal to the voltage between the legs to the ground base of Q1. The volt base-emitter (0.6 V), the zener diode volt (6.2 V), then adjust the voltage VR1.

This circuit has a temperature coefficient is very little, almost zero. The joint base – emitter of Q1 with a temperature coefficient of -2 mV per Degree Celsius Andzener didoeZD1 have the temperature coefficient of 2 mV per degree Celsius. Reduce the effect of temperature on the circuit.
The Q2 to drive the output up. However, the output voltage drops, which can be adjusted with VR1 voltage range 6.8 – 15.6V. The R3 and C1 act as RC filters, voltage ripple less.But this circuit is less than 100 mA current only, is ideal for low current circuits.

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The Safe constant current source.

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