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Return to BlogOne Button On Off Switch with 4093 and IRFZ44
Posted Jan 10, 2012 at 3:17 pm
Figure 1
The load is driven by the MOSFET IRFZ44 and 4093 AND gates are used in the circuit. The output of the 4093 IC drives the MOSFET. Only one button allows you to change the on-off state of the electronic circuits in which you use this switch. The circuit schematics is above. Click image to see the larger schematics diagram.
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2 years ago: What could be the benefit of making this circuit with gates? I am interested in building this because it looks more sophisticated than simple push-push button..
2 years ago: 4093 is a "NAND" gate (Quad two input NAND gate (Schmidt trigger)) according to Fairchild, not a "AND" gate IC. Is this drawing still correct, and just a misprint on the type of gate used?
2 years ago: thank you very much for the correction :)
2 years ago: what is benfit we can use without circuit to on and off the switch by pusins on and off.
2 years ago: Can this circuit be upgraded to be used with a 24vdc system to drive the solenoids on a pneumatic valve..?
1 year ago: the circuit is very very versatile and can drive a load through relay by adding a transistor at output.
11 months ago: It is the correct symbol for the gate used - if you look closely you'll see the tiny "o" on the output of the element, this denotes inversion, hence AND becomes NAND. The "waveform" in the NAND gate denotes the Schmidt Trigger. The benefit of using this type of gate is the Schmidt trigger "cleans" the signal from the push-button and using gates means it can be self-latching.
Hope that helps!