Single pulse when circuit is powered on

Question

I am new to electronics and I am wondering how can I use my Vcc to produce a short single pulse.

It depends on what the pulse is driving. Please edit your question to explain what the real problem is. — Transistor, Aug 07 '19 at 06:12

score 9 · Answer 1 · answered Aug 07 '19 at 06:17

9

Depending on your definition of short, and close, a single cap and resistor can do the job:

schematic

^{simulate this circuit – Schematic created using CircuitLab}

You can play with C1 and R1 to achieve the desired shape.

answered Aug 07 '19 at 06:17

Vladimir Cravero

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Maybe it is better to add that this circuit produces a positive pulse (+Vcc) when power is applied, but a negative one (up to -Vcc) when it is removed, which may cause issues to the circuit after this. In this case, adding a diode (anode to ground, cathode to PULSE pin) can solve the issue – frarugi87 Aug 07 '19 at 13:11

jDAQ · Answer 2 · 2019-08-07T17:49:22.760

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Try using a 555 IC in the monostable configuration, with this circuit you will be able to drive small loads, e.g., LEDs and logic circuits. Take a look at 555 IC It will give a response like this one

and the circuit is this one

where you should keep the trigger pin high (above \$V_{CC}/3\$) until the moment you want the pulse, at this time you should send a 0V signal to it, this circuit would do it:

schematic

^{simulate this circuit – Schematic created using CircuitLab}

edited Aug 07 '19 at 17:49

answered Aug 07 '19 at 04:10

jDAQ

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What is triggering the pulse? – HandyHowie Aug 07 '19 at 06:23
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you have to put a momentary button connecting the trigger pin to ground, I will add the circuit – jDAQ Aug 07 '19 at 17:40

Single pulse when circuit is powered on

2 Answers2