Schematic for voltage regulation via lm317

Posted on Feb 5, 2014

A simple lab-psu using the lm317, based on the first schematic. to prevent damages to my dmm when measuring mA, i`d like to include a switchable current limiter. but i`m not sure if i understand those schematics and how i could integrate it. so here are my questions: 1. 2 s. schematic 2: when Iout = R1/Vref and Vref = 1, 25v (that should be the correct value,

Schematic for voltage regulation via lm317
Click here to download the full size of the above Circuit.

when i understand it right), then i can calculate resistor values via R1=1, 25/Iout (for example R1 = 1, 25/0, 25 = 5 ohm to limt the current to 0, 25A) 1. 3 i`d like to use a rotary switch to integrate an adjustable current limiter: how can i calculate the minimal necessary specs of switch and resistors, when max. 32v dc and 1a current flow through the wires are simple 0, 25w-resistors/switchers enough most likely a 15VA transformer with 2x15v, 2x0, 5A will feed the psu. are there any disadvantages in adding a switch to change between series- and parallel-connection of the secondaries (to get 15v/1A vs. 30v/0, 5A)

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Control of three phase Induction motor AT89S52
    Lamp Dimmer schematic
    Electronic Doorbell Circuit
    Transmitting audio over laser or LED
    Cipher scheme on the basis of the ultrasonic ranger of AT89C52
    100V output with shunt regulation
    Resistance and capacitance of several phase shifting trigger circuit
    Micro-power 32.768kHz clock oscillator circuit
    INA321 OPA340 composed output buffer circuit 322