Voltage Regulator by IC 741
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Voltage Regulators are used to change a sinusoidal AC signal into a DC smooth signal which remains constant independent of changes in load current.
The series-pass transistor (Q1) is used for circuits which operate at higher current levels (typically currents higher than 100mA). The series pass transistor acts as a common-collector amplifier, also known as an emitter follower. The Series Pass transistor looks like it is part of the output stage of the op-amp. The effect of adding this transistor is that the current rating of the circuit now becomes dependent on the ratings of the transistor, not the ratings of the op-amp as before.
The Zener diode is added to the circuit to provide a reference voltage. The Zener diode is usually chosen so that the “Zener Voltage” is about half of the output voltage.
| Element | Model, value |
|---|---|
| D (diodes) | 1N4007 |
| Z (Zener diode) | D1N4734 |
| R1 | 1 Kohm |
| R2 | 16 Kohm |
| R3 | 20 Kohm |
| R4 | 500 ohm |
| R5 | 3.7 ohm |
| RL | 100 ohm - open |
| Q1 | 2N3904 |
| Q2 | 2N3904 |
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Source : http://www.qsl.net/yo5ofh/hobby%20circuits/
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