Relay switch control circuit including oscillator

摘要

An electrical circuit controls a relay switch. The control circuit includes a controllable switch and a relay coil in series. An oscillator generates different output signals according to the value of its input voltage. The oscillator output is used for switching off, switching on, and clocked on and off switching of the following switch. The oscillator includes two series-connected inverters and a network composed of an ohmic resistor and a feedback capacitor. The oscillator frequency is inversely proportional to the time constant derived from the ohmic resistor and the capacitor. The oscillator frequency is variable via the input voltage.