Most Popular Articles
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
The history of radio broadcasting extends beyond the work of a few famous inventors.
Read each issue online in our Digital Edition Format in your Web browser.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Browse Back Issues[an error occurred while processing this directive]
Also in the November Issue
- Trends in Technology: HD Radio Transmission Update
- Franken FM Stations
- Wi-Fi on Wheels: The Connected Car
- Field Report: Yamaha MG10XU
- Transmitter Site Cleanup