Current-Loop Scr Control


Posted on Jul 11, 2012

This circuit allows a 4-to 20-mA current loop to control an isolated SCR drive. IC1A and are one-shots. Q2 detect


Current-Loop Scr Control
Click here to download the full size of the above Circuit.

s zero crossings of the 120 Vac line, which triggers one-shot IC1B. IC1A causes Ql to discharge C2. When C2 recharges through R2, it triggers IC1A, and the optoisolator and SCR1/SCR2. Triggering of SCR1 and SCR2 is a function of input current, which can control motor speed, light intensity, etc.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Adjustable TTL clock
tonefrequency detector circuit
simplest led flasher
VHF field strength meter
Simple Calling Bell Using an Intercom
microcontroller complete code midi emulated ps 2 keyboard
PBL3717A motor stepper driver circuit design electronic project
Simple circuit diagram repellent
LM4911 without an output capacitor OCL power circuit



Top