Questions tagged [multivibrator]

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6
votes
2answers
22k views

555 timer, one shot trigger

I'm trying to create a circuit that will pass a 12V pulse on the rising edge of a push button (it can be triggered by the entire input pulse but rising edge preffered). I've had some experience with ...
0
votes
1answer
798 views

Is this an astable multivibrator?

In this circuit the LED flashes on and off, however could it be classified as an astable multivibrator?
1
vote
1answer
3k 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 ...
7
votes
3answers
1k views

Adding Diodes to Transistor Astable Multivibrator; 1N5818 Schottky diodes work but 1N4148 diodes don't; can't figure out why

I am an avid electronics hobbyist, not an electronics engineer. I built a transistor-based astable multivibrator circuit and then fed its output to an op amp buffer amplifier which then drove an 8 ...
3
votes
2answers
2k views

Bistable Multivibrator using discrete transistors

I am trying to understand this circuit but as of yet I still have a number of gaps in my reasoning. So far I have deduced: (assuming TR1 is ON and TR2 is OFF) left hand side capacitor charges ...
2
votes
3answers
401 views

How to skip the first pulse triggering for this circuit?

Following my previous question, I came up with the following circuit using 74HC123 for simulation and in practice planning to use this IC. The circuit out should be ON when it waits for a rising edge ...
0
votes
3answers
4k views

When does the capacitor charges and discharges in an astable multivibrator circuit?

I was reading this and couldn't figure out at what point and how are the capacitors getting discharged?
4
votes
2answers
317 views

Naive VCXO design - runs at 3rd harmonic, I need the base freq

Consider this a hobby question. (How do you call a hobby project on the fringe of your nominal work? A skunkworks job?) I mean to say that I'm not an EE design pro. I'd appreciate your opinion about ...
3
votes
1answer
181 views

What is this circuit called?

This is a circuit I made to create a high signal when a switch is opened and closed. The duration of the signal can be adjusted by changing the capacitors and resistors. It is also low powered when ...
3
votes
3answers
1k views

How to build an arbitrary (one-shot) pulse generator?

I need a circuit/IC that can generate a single pulse with a variable pulse width (I would want a minimum of 50 ns but if that is not possible the next minimum can be 1 μs, and even if that is not ...
2
votes
2answers
457 views

Unexpected output from astable multivibrator?

After following an answer to a question I asked here I created this circuit... simulate this circuit – Schematic created using CircuitLab This is the output on either of the transistor ...
1
vote
2answers
113 views

Playing around with an astable multivibrator

I had a doubt regarding the astable multivibrators using BJTs. This is a typical astable multivibrator. I have been told that if I connect a capacitor to the output channel, there would be no ...
0
votes
2answers
67 views

What actually causes the distortion in the output wave due to an Astable Multivibrator?

I've witnessed that the output square wave from an astable multivibrator using two BJTs has its edges rounded during the rise up time(just as it is seen in fig. 1). Across resources, I've come to know ...