Adjustable bipolar power supply 12/6 volts 2 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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In the laboratory of a radio amateur, as a rule, there is an adjustable stabilized power supply. By adding a simple prefix to it, you can get a bipolar power source.
A diagram of such a prefix is shown in the figure. It is designed to work in conjunction with a stabilizer with an output voltage of 12 volts and a load current of 2 A. The set-top box is equipped with a transistorized power amplifier, which made it possible to increase the efficiency of the device when the load resistance changes over a wide range.
The ratio of the output voltages of the source can be changed within 0,6 ... 1,6 with a variable resistor R2. With a ratio equal to 1, the maximum load current of each arm is 2 A, while at extreme values it should be reduced by 1,5 ... 2 times. The prefix works like a voltage stabilizer with a regulating element connected in parallel.
Operational amplifier A1 compares the voltage at the output of the resistive divider R1R2R3 with the voltage at the output "COM." power amplifier V5, V6. The difference between these voltages is minimized by a corresponding change in the bias voltage of transistor V3. The V1V2R4 chain serves to initially set the bias voltage of this transistor. If it is necessary to increase the output voltage of the console arms from 6 to 12 V, it is necessary to raise its supply voltage to 24 V and replace the opamp with K1UT401B. This will require a corresponding change (increase) in the resistance of resistors R4 and R5.
Publication: cxem.net
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