Power SuppliesVoltage Regulators Circuit Diagrams

HIGH VOLTAGE 0-400V 22MA-600MA REGULATED POWER SUPPLY TCA785 Schematic Circuit Diagram

Power supply circuit 0 cd 400v voltage setting 22ma 81 600ma (highest 1a) current setting is not too complicated on the TCA785 phase control integral but because the voltage is high, the DCDC converter used to feed TL081 opamps is difficult in the market. It seems to me that it is not necessary, but the author has used TL081 opamp with symmetric feeding + -12V operated 15V DC voltage 2x12V as an integrated power supply DCDC converter if no additional transformer can be used or tra2 transformer can be selected as additional winding accordingly. The power supply circuit has pcb, schematic drawings and a list of materials.

TCA785, 400V, high voltage, adjustable power supply

ATTENTION 0-400V 22mA-600mA Adjustable Power Supply circuit operates with high voltage Caution Be careful of the condenser connections + – If you connect the poles backward, you may have large explosions at high voltage before operating the circuit Fused Electric Line, use protective goggles.

The TL081, TL081A, and TL081B are high-speed JFET input single operational amplifiers incorporating well matched, high-voltage JFET and bipolar transistors in a monolithic integrated circuit. The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient.


  • Wide common mode (up to VCC+) and differential voltage range
  • Low input bias and offset current
  • Output short-circuit protection
  • High input impedance JFET input stage
  • Internal frequency compensation
  • Latch-up free operation
  • High slew rate: 16 V/µs (typ)

Applications of TL081 IC

  • Sample and Hold Amplifiers
  • Peak Detectors
  • Active Filters
  • Comparators
  • Interface in 5V TTL Systems and Other Low Supply Voltage Systems
  • All Standard Operational Amplifier Applications
  • Function Generators

How to use TL081 Op-Amp

An Inverting Amplifier Application circuit from the TL081 datasheet is given below. you only need two resistors to use TL081 as an inverting amplifier.

An inverting amplifier takes a positive/negative voltage on the inverting input pin and makes it a negative/positive voltage of the same magnitude. Output at the VOUT pin is feedback to input through the feedback resistor (Rf).


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