EDN

Clap Sensitive On-Off Relay

This circuit was intended to activate a relay by means of a hand clap. Further claps will turn-off the relay. An interesting and unusual feature of this project is the 3V battery operation. The ...
Electronic Design

Relay-Based ON/OFF Flip-Flop Remembers State During Power Failure (.PDF Download)

Many varieties of ON/OFF control circuits use some form of flip-flop that responds to a pushbutton switch or other control input. These all have volatile memory and default to an OFF condition if ...
Machine Design

Reborn Relays Play Key Roles in Control

This file type includes high resolution graphics and schematics when applicable. According to the research firm IHS Inc., about 54 million relays and timers were purchased in 2013, a number projected ...
EDN

Clap-Sensitive Relay with ON/OFF Feature

Clapping of hands is the main idea on how this circuit was built with the acknowledgement of a relay to cause the circuit to function with ON/OFF feature. TS555 – a single CMOS timer which offers very ...