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# Transistor regulator circuit can adjustable output voltage (

2016-05-07 06:20
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This article describes the Transistor regulator circuit can adjustable output voltage (2SC458). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:2SC458.

This circuit is maintain aconstant voltage, the output voltage is adjustable.Serves to reduce the input voltage, and keep the voltage constant.
The Q1 2N3904 is 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 And zener didoe ZD1 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.

## Adjustable voltage output control by 2SC458

This again the one circuit that use in fining value output voltage, for apply give straight with the requirement of load be the circuit that is simple and have no result temperature way of the joint junction of transistor. Vout control 0V-30V at 0.1A
The principle works be transistor Q1 2SC458 that built model common-emitter amplifier, which perform fine decrease input voltage get down then heal volt that give may but at collector voltage compare with ground. Which get from the combination of voltage at base – emitter pin (0.6V) with VZener diode (6.2V) already fine the value of a resister can fine the value VR1 help transistor part Q2 2SC458 perform be compared as power supply current source and current that fixed. By current at flow come in the way base pin of Q2 and when Q2 bias current. That already Voltage output get, with fining that a resister VR1 during 5.8V-15.8V. By have R3 and C1 perform be RC Filter caution. This circuit power current source get 100mA topmost should apply to load that use current low.