alternating On-Off Switch

Use this circuit instead of a standard on-off switch. Switching is very gentle. Connect unused input pins to an appropriate logic level (I used ground). Unused output pins *MUST* be left open! First ‘push’ activates the relay, another ‘push’ de-activates the relay.

IC1, the MC14069 (or 4069) is a regular Hex-inverter type and is constructed with MOS P-channel and N-channel  enhancement mode devices in a single monolithic structure. It will operate on voltages from 3 to 18 volts, but most applications are in the 5 to 15 volts. Although the 4069 contains protection circuitry agains damage from ESD (Electro Static Discharge), use common sense when handling this device. Depending on your application you may want to use an IC-socket with IC1. It makes replacement easy if the IC ever fails.

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