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4047 monoshot(1ms pulse width)

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vinodquilon

vinodquilon

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I have designed oneshot for 1ms Pulse width using 4047.

R5- makes output current >= 10mA to ensure load regulation.
C4- prevents bouncing of trigger switch.
1N4002- prevents discharging of c1 through LM317T.

1. Is it possible to see the 1ms 'short time' switching between RED & GREEN LEDs at output of 4047 ?

2. Can I use C4 in parallel with C1 as both have different roles in the circuit ?

3. 10K or 100K which one is better to pull down trigger switch to GND ?
 

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  • 4047monoshot(1ms).png
    4047monoshot(1ms).png
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ouput drive with debouncer

Here is another arrangement with output drive and debouncer.
 

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  • 4047_324.png
    4047_324.png
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Re: ouput drive with debouncer

For your concerns:
1. Good visual starts reasonably from 0.5secs for the RED and/or GRN LEDs
2. Yes, you can parallel the capacitors.
3. I will suggest 10K for faster-pull up although this selection will impact a battery operation.
Hope this helps.:-D
 
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