Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [one-shot]

24 questions
6
votes
1 answer

Current-limited H-bridge

I attempted to design my own H-bridge (P-MOSFET high-side), using a comparator hooked to a one-shot to limit current, modeled after the one-shot current-limited schematic described here. Upon applying power (VINP is nominally 12 V), the circuit…
James Suffolk
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3 answers

how to design a circuit that gives high output between input transition and next rising edge of CLK

I'm trying to understand how can one build a circuit that does the following functionality: I see according to the output that I should have a D-FF, that works at Falling-Edge mode, so I need to add an inverter to the CLK. how can I continue from…
Firas Abd El Gani
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2
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1 answer

Can the output impedance on af op-amp be set to 50 ohm regardless of frequency?

I want to make a circuit with an output impedance of 50 ohms. I am dealing with negative photomultiplier tube pulses that in 50 ohm load look like in the picture below: I want to use the pulses to trigger the one shot sub-circuit described here…
Chris Sy
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2
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4 answers

Dual edge detector

I am designing a hobby project that will run on a battery so I am trying to reduce power consumption. The SoC I am using has the ability to go into a deep sleep mode where it consumes very little power, and then can be interrupted by a falling edge…
billbo
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vote
1 answer

Time relay and solenoid valve

For a project, I need to control a normally closed solenoid valve and be able to apply a current on the valve only for a set amount of time before closing it again, and only once (so no cycle). I think I could use a time relay to do so, but it seems…
Dan B.
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0 answers

Multisim (2008) - How do I provide a reset stimulus using a controlled one shot pulse, in order to properly initialize my design under simulation?

Apologies for the captured image quality but I have a circuit from a communications textbook Fundamentals of Electronic Communication Systems 3rd Edition, by Louis E. Frenzel Jr. The image below consist of a Commutating SCF (Switching Capacitive…
Vahe
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1 answer

Timed one-shot circuit to drive laser module

I'm trying to adapt my Match Guns MGH1 (Air pistol with electronic trigger) to use trigger a laser when shooting. Currently the trigger circuit is driving a solenoid. The circuit board seems to have the trigger signal passing through a monostable…
Pedro Osório
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vote
1 answer

Uninterruptible Power Supply - Reset the load when power is restored

My system is powered by a redundant supply (UPS). When the input power supply is removed, the system detects this event and it performs a safe shutdown (actually it is a microcontroller that enters a power-down mode after performing few…
Roland Korg
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vote
2 answers

Why does adding this low pass-filter to a monostable multivibrator prevent triggering?

A 24 VDC sinking sensor is tied to an SSR. The SSR converts the signal from 24 VDC to 5 VDC. The output of the SSR goes directly to input B of a 74121 One-shot. (The diagram has a resistor and capacitor in between that were not there originally).…
Rich Shealer
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1
vote
1 answer

Regenerating the Gate of a Gated Pulse Wave

I'm looking for suggestions for alternative solutions to a design problem I have. Basically converting a gated pulse wave back into it's enabling gate. Bottom of the post lists the solutions I've come up with so far. Background: Immediately…
Stephen Thomas Barnwell
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1 answer

What does the diode in this D flip-flop "One-shot" do?

Does this diode help discharge the capacitor once the flip-flop is reset? Thanks in advanced. (Image was taken from http://educypedia.karadimov.info/library/oneshots.pdf)
Josh Ito
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One shot monostable multivibrator with OA, output active low

I need to make a one-shot multivibrator with a OA, since in the main design, one OA is available form a package with 4 (single supply). Triggering can be either POS or NEG since I can adapt the circuit before. What I really need is OUT pulse to be…
yo3hcv
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One-Shot circuit has problems with slow voltage ramps

I'm using this circuit: simulate this circuit – Schematic created using CircuitLab The circuit is powered by "24V" , "24V ENABLE" is the trigger. The circuit should act like a one-shot signal (or single impulse) that is OPEN for about 100us…
Singed
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PIC16F Timer 2 one shot not running

I am using a PIC16F18877 to control some LEDs on a control panel. The whole project is rather huge, involving multiple processors communicating via SPI. This particular processor is controlling 88 LEDs in an 11 x 8 matrix arrangement. Pins RA0-RA7…
Marcus_Darkmoor
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2 answers

One shot pulse generator Low->High->Low even if button is still pressed?

I am trying to use a 555 IC to create a low-high-low pulse that will trigger only once and still go low even if the button continues to be pressed. This is the circuit I have now but the pulse stays high if I continue pressing the button: Edit:…
dom_g
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