Questions tagged [one-shot]
The one-shot tag has no usage guidance.
28 questions
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PC ON/OFF switch with LED
I want to make an external on/off switch for a PC. The PC motherboard has 4 pins: two named LED+- and two named +-
Unfortunately I don't know how much current can be drawn from the LED pins (or if ...
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159
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Analysis of NAND-based low-power monostable circuit
I've seen a monostable multivibrator circuit shown below. The purpose of the circuit is to provide a power to a circuit for an amount of time controlled by potentiometer after pressing the momentary ...
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2
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576
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How does this BJT monostable one-shot work?
This circuit comes from Hamilton's Handbook of Linear Integrated Electronics for Research, 1977, p. 240. It is similar to the common BJT monostable multivibrator, but it doesn't include the feedback ...
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567
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Monostable "One shot" 555. Longer trigger than T (output pulse width) eliminator
It seemed to me that a classical "one shot" output will go low after a determined period set by T (Output Pulse Width), even if push button is held down. What I want to happen is, when the ...
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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 ...
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287
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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 ...
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104
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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 ...
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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 ...
- 457
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2
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308
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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 ...
1
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2
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1k
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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 ...
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2
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453
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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 ...
- 127
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116
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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 ...
- 127
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307
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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 ...
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3
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3
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870
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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 ...
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1
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451
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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 ...
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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 ...
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1
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150
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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 ...
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412
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How to terminate DONE pin on TPL5110 when unused?
I'm using a TI TPL5110 in one-shot mode and do not need the DONE signal to shut down the timer.
I would leave it alone, but static often makes it trigger, turning the timer off. Since the TPL5110 ...
1
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1
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139
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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 ...
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2
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416
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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 ...
- 139
2
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1
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1k
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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 ...
- 147
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1
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203
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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
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4
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12k
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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 ...
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462
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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 ...
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1
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199
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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 ...
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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)
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1
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256
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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, ...
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1
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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 ...
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