Push-on/Push-off Switch


        Radio on FacebookJoin us on Facebook

This circuit was submitted to Broadcast Management and Engineering magazine's Great Idea Contest in 1987 where it was awarded the National First Prize. This circuit was designed at the request of Carl Hanson at KNX-FM and designed by Mike Callaghan, chief engineer of KIIS-FM, Los Angeles.

How it Works When power is first applied to the circuit, the parallel combination of C1/R2 is charged to 1/2 Vcc through the voltage divider R1/R2. When S1 is closed, C1 discharges through the coil of RL1. This pulls in the relay. The wiper is held in by the current through RL1 and R1.

Any charge remaining on C1 discharges through R2, so when S1 is pressed again, C1 (now a short circuit) releases the relay, returning the circuit to its original condition.

What results is a toggled push-on/push-off action. The momentary switch can originate from another machine or switch closure.




Acceptable Use Policy
blog comments powered by Disqus

[an error occurred while processing this directive]

Today in Radio History

Milestones From Radio's Past

The history of radio broadcasting extends beyond the work of a few famous inventors.

EAS Information More on EAS

NWS XML/Atom Feed for CAP Messages

The feed provides feeds for all US states and territories.

Wallpaper Calendar

Radio 2014 Calendar Wallpaper

Need a calendar for your computer desktop? Use one of ours.

The Wire

A virtual press conference

Information from manufacturers and associations about industry news, products, technology and business announcements.

Join Us Facebook Twitter YouTube LinkedIn
Radio magazine cover

Current Issue

Powered by NASH: Cumulus Delivers Country From Nashville

Cumulus builds a new campus in Nashville to house its NASH family of brands

Browse Back Issues

[an error occurred while processing this directive]