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This decrease of output voltage (Vout) makes V BE of Q2 to decrease. When the output load increases, the output voltage (Vout) gets reduced.This decrease in V BE increases the collector emitter resistance of Q2 and so the output voltage (Vout) gets reduced accordingly. This increase in Vout decreases the base emitter voltage of Q2 because the zener diode D2 is operating in the breakdown region and the voltage across it is unchangeable. When the input voltage (output of the rectifier section) increases, the output voltage of the regulator (Vout) also increases.The overall working of the circuit can be demonstrated by explaining two situations. Resistor R1 provides the base current for Q1 and also keeps the zener diode D2 in the active region. Transistor Q1 (2N 3054) and Q2 (2N 3055) form a darlington pair.
2N3055 TRANSISTOR LINEAR RESPONSE BIAS SERIES
The circuit shown below is a basic series voltage regulator based on transistors. MOTOROLA SEMICONDUCTOR TECHNICAL DATA N PN Silicon Power Darlington Transistors Generalpurpose EpiBase power Darli ngton transistors, suitable for linear. Additional series pass transistors have to be added to the 7805 based regulator circuit for improving their current capacity. The differential amplifier can be implemented with BJTs or MOSFETs. normally connected to operate in the zero bias mode which is the photovoltaic mode 11, 12. We had a brief glimpse at one back in Chapter 3 section 3.4.3 when we were discussing input bias current. Keywords: solar panel, photodiode, transistors, current. Conventional integrated series regulators like 7805 can only deliver up to 1A. The differential amplifier is probably the most widely used circuit building block in analog integrated circuits, principally op amps.
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Such transistor voltage regulators are suitable for application where high output current is required. Regulated DC Power Supply using transistors.Ī low ripple regulated DC power supply designed based on transistors is shown here.