Showing posts with label scr. Show all posts
Showing posts with label scr. Show all posts
Monday, November 17, 2014
Rain Detector using SCR 106CY
This circuit uses a sensor made of a small piece of circuit board and recorded a simple SCR circuit to detect rain and sound of a bell. The SCR could also be used to activate a relay, light a lamp, or send a signal to a security system.
1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.
2. Make sure to use a loud buzzer.
Thursday, September 4, 2014
Simple Scr Replacing Latching Switch Wiring diagram Schematic
Build a Simple Scr Replacing Latching Switch Circuit Diagram.This schema provides the tum-on characteristics of an SCR, but turns off with ease. The switch is comprised of three transistors with descending current ratings: Q3 has a high-current rating and Q2 has a medium rating.
Simple Scr Replacing Latching Switch Circuit Diagram
The current, !1, to be switched is 15 A. Momentarily depressing S2 removes Ql`s base drive, turning Ql off and allowing Q2 to tum on. Q2 then drives the base-emitter junction of Q3, turning Q3 on. Q3`s collector-emitter voltage, which ·serves as Ql`s base drive, is essentially zero, keeping Ql off. To tum Q3 off, depress Sl; this action momentarily shunts Q2`s base current to ground, reversing the chain of events that turned Q3 on.
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