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Questions tagged [edge]

The tag has no usage guidance.

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0answers
57 views

Problem with signal edge in schematics containing high speed IC switch

I am trying to design the following schematics: There are two kOhms resistance which are connected serially. One is load and another is device resistance. I need to apply the voltage in a the ...
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1answer
40 views

Trigger Edge Detection Voltage issues

I'm trying to get an ESP8266 to wake up via external trigger. The trigger in this case is a PIR, which sends a 2+ second high signal when motion is detected. I'm using an edge detector to turn that ...
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1answer
55 views

Active high, rising edge circuits update state when, exactly?

I'm very new to electrical engineering. On a recent exam, we had a circuit with two JK flip-flops connected in series with one another. The circuit is beside the point, however. Both flip-flops were ...
-3
votes
1answer
310 views

How to implement a negative edge triggered D Flip Flop (Master Slave Configuration)?

Can you please post a picture of the implementation of such flip-flop at logic gate level? How can I easily change a positive edge triggered D Flip Flop to a negative edge? Also, how will the truth ...
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0answers
33 views

Sobel Edge Detection - estimating possible memory requirements

I'm looking into doing Sobel Edge detection on a FPGA. I'm interested in the memory requirements of the output of the Sobel edge detection. I'm trying to do Sobel edge detection on 250x250 pictures. ...
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1answer
90 views

Synchronize random edge to clock edge

I have a steady clock signal and another signal with random binary pulses. Is there a simple circuit that can detect the rising edge of the random pulses and generate a pulse that is synchronized to ...
2
votes
2answers
493 views

Overshoot on MOSFET drain

What can i do to minimize overshoot and undershoot when MOSFET switches on and off? (waveform taken using short ground spring probe, PCB is 2-layer) The rise and fall times should be less than 150ns. ...
1
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1answer
675 views

555 positive and negative edge detector?

Is there a circuit using the 555 (without additional logic gates) that creates a positive pulse when it detects a rising or falling edge? The goal is to have a circuit that detects when a signal goes ...
1
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1answer
454 views

Why does this Edge Trigger Work on input of 555 monostable config?

I recently wired up a 555 timer in a mono stable configuration and found that when the trigger was held low for longer than the configured output pulse width, the output would stay high. After ...
4
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1answer
520 views

Long lines: whether or not to treat PCB traces as RF lines

My setup: 53 x 28 mm PCB, uC will run somewhere between 1 MHz and 8MHz. Dual layer PCB design. From the info I gathered on this site it seems there are two aspects to consider in deciding how to ...
0
votes
1answer
865 views

transistor negative edge-triggered detector

This is a circuit I whipped up for an attempt to make a negative-edge triggered detector with inverted output. The logic needs to be the following: If input is high, output is high. If input goes ...
0
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1answer
371 views

turn level-based input to edge-triggered input [duplicate]

I'm trying to figure out with the most minimal part count how to convert an input of a digital IC to an edge-triggered input. I am using the 82C55 IC and the input on it I want to make negative edge-...
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2answers
939 views

Falling and Rasing Edge Detector

I will use a motor adapter in my design.This motor adapter doesn't have a spice model. Therofore I will design inside structure of this adapter. In this motor adapter has a delay and xor gate part.I ...
1
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2answers
655 views

Edge-triggering on simple logic

I'm making a module where a microcontroller can control RAM with only 10 GPIO pins (8 is data D0 through D7 and 2 are control). One thing I want to do is that the moment a control line is raised, I ...
0
votes
2answers
734 views

How to get rid of this reflection on falling edge of i2c SDA line?

This is the scopeshot of the falling edge: How to get rid of the reflections on the falling edge of this SDA line?
3
votes
1answer
372 views

How to clean up ringing / noise on rising edge of CMOS output?

I am feeding an interrupt input with the output from a CMOS Schmitt inverter. The falling edge of the inverter is nice and clean, But the rising edge is really dirty, and can get downright ugly at ...
2
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5answers
3k views

convert falling / rising edge to pulses with minimal components

I have a signal that changes from high state to low every few minutes, after changing state it will remain constant, all level changes are clean. I'm looking for the smallest possible circuit that ...
1
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3answers
375 views

Arduino code - Why do we need to read the rising edge?

I'm having a difficult time figuring out why we need to read the rising edge instead of using both edges. We are doing a school lab using interrupts in Arduino code, and I understand that we need ...
3
votes
4answers
9k views

How to generate edge-triggered pulse

First, a bit of background: I am just a hobbyist with electronics and have very little formal education in the area. I understand most terminology, but generally require a schematic for me to be able ...
3
votes
1answer
905 views

Why is D Flip Flop Positive Edge Trigger instead of a Level Trigger

So i'm trying to understand this D type Positive Edge Flip Flop: simulate this circuit – Schematic created using CircuitLab I'm having problem understanding why it's a Positive Edge triggered ...
2
votes
1answer
260 views

Reconize JK Flip-Flop operating edge: rising or falling?

This is a JK Flip-Flop image. Using this image is there a way to know if the output changes on raising or falling clock? In other words, is input data transferred to the outputs on the HIGH-to-LOW ...
1
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1answer
1k views

What is the purpose of the sharp edges (aka mouse bites, aka perforated breakaway tabs) on the PCB?

I have received an NVIDIA Jetson board this week and it has the following edges near the mount holes: I did a quick search on the internet but was only able to find similar edges on the Raspberry Pi ...
0
votes
2answers
566 views

How to view pre-trigger data on digital scope (Owon SDS-7102)

Noob oscilloscope user here. I want to view the voltage rise on my oscilloscope when I connect a device to a 1.5VDC power source, to see how clean the connection is - i.e. how many times the voltage ...
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3answers
747 views

Feeding higher voltage sine wave to Arduino interrupt pin

I want to use Arduino to count cycles from a bicycle generator. This generator has variable frequency (which I want to measure), but also variable voltage that is proportional to wheel speed, ...
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1answer
123 views

Input protection with MAX366 exhibits very slow falling edge. Why?

I'm using the following circuitry to protect my microcontroller input pin from the dangers of the bad and ugly outside world (a trigger signal coming from an unknown source). The signal comes in from ...
1
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1answer
2k views

PWM with programmable Dead Time

I need to make a circuit that generates a PWM signal for a motor. The motor has 2 inputs - P and Q. They are the inverse of each ...
1
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2answers
1k views

How does this synchronizing/edge detector logical diagram work?

This is the logic diagram for a MCU that allows for an external clock option via Tn. This clock can be used as the source for clocking an internal timer register. ...