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Build a Robust MOSFET Toggle Switch Circuit – 12V, IRFZ44
Description
This schematic has been derived from the “Toggle Switch Debounced Pushbutton” design created by John Lundgren. It proves beneficial in scenarios requiring a load to be activated at a specific place while being deactivated from another. A variable number of momentary (Normally Open – N/O) switches or push buttons can be integrated in parallel.
The arrangement (10K, 10uF and diode) on the left side of the diagram ensures the circuit is initially powered with the load deactivated, and the NPN transistor is conducting. These elements can be removed if the initial power-up state is not a consideration.
When a switch is activated, the 1uF capacitor’s voltage is connected to the intersection of the 220 ohm and 33K resistors, resulting in a change in the circuit’s operation. When the switch is released, the capacitor charges or discharges to the new voltage level through the 1M resistor, and the circuit prepares itself for another toggle operation within approximately one second. It takes a brief period for the capacitor to stabilize at the new voltage, either positive supply voltage or ground.
The (0.1uF) capacitor at the transistor’s base was incorporated to mitigate potential noise that could lead to unwanted triggering, particularly when the switches are situated far from the circuit. This circuit was evaluated utilizing a 12 volt, 25 watt automotive lamp and the IRFZ44 MOSFET. Alternative MOSFETs are likely compatible.
Integrated Circuit (IC) Details
An Integrated Circuit (IC) is a complex electronic circuit fabricated on a single semiconductor chip. It typically combines multiple discrete components, such as transistors, resistors, and capacitors, into a compact and reliable package. The IRFZ44 is a low-threshold voltage MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) which is frequently utilized in switching applications due to its efficient operation at relatively low gate voltages. These ICs are crucial in controlling the flow of electrical current in electronic circuits.
Circuit diagram
