Switches and relays circuit diagrams

Schmitt Trigger

This circuit uses a single op-amp and the output is triggered by two different voltage levels.

10 Way Electronic Switch

This is a 10 way electronic latching switch using just two push-to-make switches. Each output can be latched on and off independently.

Capacitive Sensor

Special design for shop-windows animation. Useful for many types of touch controls

Switch De-Bouncer

This circuit will remove the transient spikes and contact bounces from a non-latching push button switch.

Latch Switch 2

This circuit uses a Silcon Controlled Rectifier (SCR) as a latch switch. Once enabled it can only be turned off by pressing S2 or power is removed from the circuit.

Camera Switcher

This circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically.

Latch Switch

In this circuit a non-locking push switch is used to activate a load. The load remains switched on until power is removed from the circuit.

VCS using 555 Timer

In this circuit the 555 timer is used in a novel way, as a voltage controlled switch.

Electronic Door Release

The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key,say one of the two non-numeric symbols.

AC Switch

An AC triggered switch for low frequency signals.