Voltage controlled toggle switch. www.haraldswerk.de

Motivation

Not much to say. Just a unidirectional toggle switch. The input is switched between two outputs. Voltage controlled. Status signaled with LED.

Specs and features

Buffered in and output
Unidirectional
Status signaled by LED
Runs on +/-15V and +/-12V
Power consumption below 15mA each rail

Implementation

Schematic

Description:

The interesting point here is the overvoltage protection for the control voltage input. This is done with the MCP6002 rail to rail operational amplifier. He is powered between GND and +5V. So, no negative or positve voltage above +5V will go through it. The diode in the input is not neede for voltage protection. The diode protects the voltage source when it supplies a negative voltage. Without the diode the negative signal is loaded by the input of the MCP600x. The 1M resistors are there to provide a defined potential.

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