Direct Coupled On/Off Touch Switch

The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this circuit is directly coupled with line voltage, a 1 M resistors in series with the touch plates is employed  to ensure user safety, avoiding hazardous high voltage shock. This high resistor values is […]

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Separate ON-OFF Touch Switch

Providing a touch switch can be a cool way to make your circuit looks sophisticated. Moreover, providing separate touch pad for “on” and “off” function improve the safety, since touching one function doesn’t trigger opposite action to what we expect even at wrong assumption about current state. Here is the schematic diagram of the circuit: How this circuit works is […]

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