Category «Power Supply»

Direct High Voltage DC Regulator

This regulator circuit stabilize the output voltage at 200V directly (without a transformer). Although the output voltage is high, this circuit only suffer a tension of the voltage drop (Vinput-Voutput), which is suffered mainly by the transistors. The op-amp suffers even less tension, since it regulate the applied voltage at their pins around the level …

Foldback Current Limited High Voltage Regulator

This circuit is high voltage regulator which has foldback current limiter protection. This circuit uses LM10 comparator with voltage reference, and this core integrated circuit is connected directly to high voltage circuitry. This high voltage direct connection is possible since the IC is inserted to a bias network and directly drop the applied voltage, so …

Auto-Off 12V NiCd Battery Charger

NiCd/NiCad battery charger circuit is still needed since some application demanding high current is still rely on NiCd type, since this type is still superior in term of  high current output (low internal resistance) and low cost. This  battery charger circuit is used to charge 12V NiCd battery at  around 74 mA until battery is …

Transceiver Saver (Overvoltage Protector)

This is a transceiver saver circuit that protect  a transceiver device (applicable to other device as well)  from overvoltage of the power supply. This circuit is used to protect the device  by regulating the power supply,  avoiding damaging the device if overvoltage occurs.  If the transceiver transmits current of above 2A, a heatsink should be …

26V-to-5000V DC-DC Converter

This circuit can provide 5,000 VDC from 26 VDC. This circuit has ripple of under 0.01% due to Voltage-doubling capacitors. As sinusoidal oscillator, a 2N217 transistor is used. The diode and the capacitors at the output stage should be of high voltage type.  Here is the schematic diagram of the  circuit: