Posted on Dec 9, 2012

Many systems require one or more relatively low-current voltage sources which can be programmed tna few predetermined levels. The circuit shown above produces positive output levels, but could be modified for negative or bipolar outputs. Q1 is the series regulator transistor, selected for the required current and power capability.

Click here to download the full size of the above Circuit.

R1, Q2, and Q3 form an optional short circuit protection circuit, with R1 chosen to drop about 0. 7 V at the maximum output current. The compensation capacitor, C, should be chosen to keep the overshoot, when switching, to an acceptable level.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Adjustable filter provides lowpass response
    LED Dice circuit
    Car Parking helper
    Automatic telephone recording circuit
    Portable Nicad Charger
    20W Car Audio Amplifier with LM1875
    DIY Stepper Controller Circuit
    Low Frequency CTCSS PL Sub-Tone Audio Oscillator
    Infrared burglar alarm circuit
    Dual power contactor automatic recovery circuit