Monostable circuit

Question

Please, I need simplest possible monostable circuit (with like NE555, 74121, 74123 etc.) that will provide output like in this diagram .I am wanting to limit the time that the output is high irrespective of how long the input is high .Would a simple RCD differentiater do the trick?

Please define "simplest". Cheapest, smallest, fewest parts, ...? — uint128_t, Jan 10 '16 at 01:50
@IgnacioVazquez-Abrams Without the shortened pulses a wire would work. — Spehro Pefhany, Jan 10 '16 at 03:10
@SpehroPefhany: I mean the first and fourth pulses in the diagram. — Ignacio Vazquez-Abrams, Jan 10 '16 at 03:15

score 4 · Accepted Answer · answered Jan 10 '16 at 03:19

The solution to this circuit design request should be pretty easy. Use a half of a dual non-retriggerable monostable multivibrator such as the Fairchild 74VHC221A. Connect it up like this:

The circuit will use the two states highlighted in the truth table.

score 3 · Answer 2 · answered Jan 10 '16 at 03:20

3

D1 may not be necessary; may already be present in internal circuit of AND gate.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

answered Jan 10 '16 at 03:20

jp314

18,902
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This is also a good solution but I guess would require some input buffer with low resistance output and that would require extra components – 69676F72 Jan 10 '16 at 14:16
Perhaps -- but the OP didn't have any other information about the system. – jp314 Jan 10 '16 at 16:24

score 1 · Answer 3 · answered Jan 10 '16 at 20:01

1

This might work as well:

Simulate circuit in Falstad

answered Jan 10 '16 at 20:01

fredrik.hjarner

420
6
12

Monostable circuit

3 Answers3

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