JPH0263107U

JPH0263107U -

Info

Publication number: JPH0263107U
Application number: JP14288588U
Authority: JP
Priority date: 1988-10-31
Filing date: 1988-10-31
Publication date: 1990-05-11

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の回路図である。１，２，３，４……トランジスタ、５，６，７
，１８……抵抗、８……負帰還回路部、９……コ
ンデンサ、１０……差動増幅器、１１……可変出
力端子、１２，１３，１４，１５……直流電源、
１６……可変抵抗、１９……移相回路。 FIG. 1 is a circuit diagram of an embodiment of the present invention. 1, 2, 3, 4...transistor, 5, 6, 7
, 18...Resistor, 8...Negative feedback circuit section, 9...Capacitor, 10...Differential amplifier, 11...Variable output terminal, 12, 13, 14, 15...DC power supply,
16...variable resistor, 19...phase shift circuit.

Claims

[Claims for Utility Model Registration] A positive voltage control circuit unit including a positive DC power supply, a first transistor that series-controls the output voltage of the positive DC power supply, and a second transistor that drives the first transistor; , a negative voltage control circuit section including a negative DC power supply, a third transistor that series-controls the output voltage of the negative DC power supply, and a fourth transistor that drives the third transistor; and the positive voltage control circuit section. a common variable output terminal that combines the output of the negative voltage control circuit with the output of the negative voltage control circuit, and a variable resistor that extracts an arbitrary DC voltage from a predetermined DC voltage from positive to negative;
a differential amplifier that inputs a voltage obtained by feeding back a part of the output voltage of the variable output terminal and a voltage taken out from the variable resistor and amplifies the difference voltage between the two voltages, and the output of the differential amplifier A variable voltage power supply characterized in that the second and fourth transistors are controlled to output any positive or negative DC voltage to the variable output terminal.