Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
555 One-Shot Timer Has Zero Quiescent Power - One-shot timer uses no power when quiescent, useful for battery powered circuits
The 555 monostable timer circuit is commonly used when a one-shot pulse of up to a minute or so is desired as initiated by an input trigger.
In some designs, particularly battery operated circuits, it is desirable that the circuit use no power when not triggered and the circuit is quiescent.
Discussed here is a modification of a typical 555 one-shot circuit that uses a couple of transistors to remove the power when the one-shot output is over.
An added bonus is that these transistors also...
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