Questions tagged [one-shot]

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6 votes
1 answer
219 views

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 ...
0 votes
0 answers
79 views

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 ...
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1 vote
1 answer
48 views

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 ...
  • 13
0 votes
0 answers
31 views

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 ...
  • 367
0 votes
2 answers
104 views

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 ...
0 votes
2 answers
233 views

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 ...
0 votes
2 answers
116 views

7555 optional control voltage capacitor

I'm using an ICM7555 chip for a monostable/one-shot circuit. https://www.renesas.com/sg/ja/document/dst/icm7555-icm7556-datasheet In the figures, it shows a capacitor on pin 5 (control voltage). But ...
  • 117
0 votes
1 answer
84 views

555 one shot missing a beat

I built a monostable multivibrator circuit with a 7555 chip. It has 1MΩ and 4.7μF components for timing, giving a pulse width of 5.17 seconds. It also has an RC on the trigger with 10kΩ and 0.33μF for ...
  • 117
1 vote
0 answers
176 views

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 ...
  • 139
3 votes
3 answers
268 views

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 ...
  • 593
0 votes
1 answer
220 views

Tektronics 453 - Saving a single shot waveform for later analysis

I recently purchased a used analog Tektronix 453 and I want to capture some single shot transients. I also want to "save" the waveform so I can more easily measure things like peak to peak ...
  • 628
0 votes
2 answers
302 views

How to bypass continuous input on Trigger pin of 555 IC after some time working in Mono-Stable/ One shot version?

I configured the 555 IC such that it gives the output pulse for 3 Seconds (Approx.) as soon as there is input on trigger pin, but my project requirement is; even if there is input continuously on ...
0 votes
0 answers
74 views

one-shot circuit with infrared sensor

If our hand is near the infrared sensor, it will remain in HIGH condition until we release the hand from the sensor. How can an additional circuit (without a microcontroller and without another ne555) ...
1 vote
1 answer
91 views

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 ...
1 vote
1 answer
96 views

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 ...
1 vote
2 answers
265 views

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 ...
1 vote
1 answer
896 views

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 ...
  • 137
0 votes
1 answer
162 views

IC 555 as monostable multivibrator

How is the output of a monostable multivibrator affected if the trigger pin is kept at a negative voltage (0V)? The upper voltage reference comparator will change its output to logic 1, while the ...
2 votes
4 answers
8k views

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 ...
  • 63
0 votes
1 answer
358 views

How can I toggle a one shot during the timing cycle?

I need a non-retriggerable one shot circuit (monostable) that will turn off during the timing cycle if a second input/trigger pulse is received. I.e. I wish to have a single momentary switch to start ...
  • 11
1 vote
1 answer
176 views

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 ...
1 vote
1 answer
2k views

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)
0 votes
1 answer
209 views

RF one-shot circuit capable of producing 5-ns pulse [closed]

I am looking for a one-shot circuit capable of producing a 5-ns output pulse with short switching time. I saw this one (http://www.nxp.com/documents/data_sheet/74LV123.pdf) in a previous question, ...
0 votes
1 answer
2k views

Help with using monostable one-shot multivibrator?

Above is the schematic I simulate in LTSpice. The input signal is a 8V pulse train with 100us ON time and 2250us period. The signal is fed as an input to the timer 555(NE555 in LTSPice). I'm trying ...
  • 11.4k