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:

New Circuits

.

 


Popular Circuits

Diode tester using PIC 16F84
Temperature sensor and DVM interface
System Modeler
BlueTooth Ericofon
555 Voltage Doubler Relay Driver
Automatic Battery Charger 6V-12V with Relay cut off by LM324
12vdc 220vac inverter using cmos cd4047
vcd
ECG Amplifier By TLC274
U-110 1.5 Mhz Current Mode Ic Controlled 50-watt Power Supply



Top