How to achieve multi-point control of field effect tube electronic switches

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How to achieve multi-point control of field effect tube electronic switches [Copy link]

This circuit was adapted from "Toggle Switch Debounce Pushbutton" by John Lundgren. This circuit is useful for loads that need to be switched on from one position and off from another. Any number of momentary (N/O) switches or pushbuttons can be connected in parallel.

The combination on the left side of the schematic (10K, 10uF and diode) ensures that the load remains disconnected when the circuit is powered on. If the initial power-up state is not an issue, these components can be omitted.

When the switch is pressed, the 1uF capacitor is connected to the junction of the 220 ohm and 33K resistors, the NPN transistor is turned off, and the FET is turned on to turn on the load. After releasing the button, the 1uF capacitor is charged through the 1M resistor. When the switch is pressed a second time, the voltage after the 1uF capacitor is charged is loaded to the base of the NPN transistor, the transistor is turned on, the FET is turned off, and the load is powered off.

Add a 0.1uF capacitor to the base of the transistor to block noise that could cause false triggering if the switch is located far from the circuit. The circuit was tested using a 12 volt, 25 watt automotive light, and an IRFZ44. Other MOSFETs can probably be used.

annysky2012

This circuit is quite practical.