The data sheet of an RC 4195 lists a maximum output current of 150 mA for each supply and a load regulation of 3mV. The positive input may be from + 18V to + 30V and the negative input from – 18V to –30V. The device needs two unregulated input voltages. Circuit Diagram of Dual Tracking Voltage Regulator This regulator is used when split-supply voltages are needed.
The dual-tracking regulator provides equal positive and negative output voltages. This formula is valid from 1.25 V to 37V. The data sheet of an LM 317 gives the following formula for the output voltage : The figure above shows an unregulated power supply driving an LM 317 circuit.
The LM 317 is a three-terminal positive adjustable voltage regulator and can supply 1.5 A of load current over an adjustable output range of 1.25V to 37V. Circuit Diagram of Adjustable Voltage Regulator The most popular three-terminal IC adjustable voltage regulator is the LM 317. output voltage that is within its two specified limits. The adjustable voltage regulator can be adjusted to provide any d.c. The unregulated negative input voltage Vi is connected to IC’s IN terminal and the IC’s OUT terminal provides – 12 V. Capacitors used in the circuit perform the same function as in a fixed positive regulator. You can see how 7912 IC is connected to provide a fixed d.c. You can see the circuit diagram of fixed negative voltage regulator below.
IC 7800. SERIES
Note that 7900 series provides fixed regulated voltages from – 5V to – 24 V.Ĭircuit Diagram of Fixed Negative Voltage Regulator This series (7900) is the negative-voltage counterpart of the7800 series . The 7900 series of IC regulators is commonly used for this purpose. This IC regulator provides a fixed negative ouput voltage. The input capacitor (C1) is used to prevent unwanted oscillations. The output capacitor (C2) acts basically as a line filter to improve transient response. Capacitors, although not always necessary, are sometimes used on the input and output. The unregulated input voltage Vi is connected to the IC’s IN terminal and the IC’s OUT terminal provides + 12V. You can see how the 7812 IC is connected to provide a fixed d.c. The figure above shows the circuit diagram of fixed positive voltage regulator. Circuit Diagram of Fixed Positive Voltage Regulator
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