Questions tagged [multivibrator]
The multivibrator tag has no usage guidance.
168
questions
1
vote
1
answer
71
views
Most energy efficient way to make a LED blink using a multivibrator [duplicate]
I'm using this LED. I want to make this LED blink at MAX brightness (100 mA) at 1 Hz. I need to use a multivibrator and therefore can't use any IC chips. The circuit is powered by a 3.7V battery with ...
- 11
1
vote
2
answers
60
views
Role of the load resistors in an astable multivibrator
I am currently trying to wrap my head around astable multivibrators. I want to design a circuit that oscilates at about 1 kHz. The formula I am using to determine the values for the base resistors (I ...
- 55
0
votes
1
answer
144
views
Timed momentary switch modifier
I would like to design a circuit that adds a power off delay
What would you suggest, is it possible to solve that basing only on the circuits batteries? Modifier from the market uses own 9V power ...
- 35
0
votes
2
answers
286
views
CD14538 and MC14538 are advertised as interchangeable, but one works on my board and the other doesn't
I am repairing a board that originally uses MC14538 (dual monostable multivibrator) ICs. Since these are obsolete, I planned to use CD14538s, whose datasheet claims that the two are interchangeable.
...
- 19
1
vote
1
answer
147
views
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 ...
- 35
1
vote
1
answer
76
views
Modified astable multivibrator with sharp edges
I am designing an astable multivibrator that would avoid rounded output edges and also has a totem pole output, so it is able to drive a small charge pump.
So I decided to replace a collector ...
- 1,965
5
votes
2
answers
179
views
What is this extra diode (LED) between the bases of transistors in an astable multivibrator?
Can someone explain what this extra LED between the bases of the transistors in an astable multivibrator does?
I built the prototype and I see that without this LED there is no blinking. Both sides of ...
- 51
2
votes
5
answers
485
views
Why does the frequency of an astable multivibrator depend strongly on the supply voltage?
More specifically, my question is why does the natural frequency of the canonical (basic) symmetric transistor astable multivibrator (STAM) vary so strongly on the power supply voltage? As a follow-...
- 23
0
votes
2
answers
350
views
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 ...
- 764
1
vote
0
answers
79
views
Struggling with the design for a simple logic circuit [closed]
I'm working on a circuit that would store 4 bits and flash them on an LED. These would be stored on a 4 bit register, and should be outputted when a button is pressed. My goals is to take my 4 outputs ...
- 19
2
votes
2
answers
268
views
555 Timer Astable Multivibrator Circuit Analysis
I was looking at a dead Molex "Suitcase" terminal applicators and found on its controller board this 555 circuit. It appears to be an astable multivibrator, but not the typical kind.
It ...
- 87
3
votes
3
answers
214
views
Is there any such thing as a tristable, quadristable, etc. multivibrator?
The title says it all.
Is there a discrete circuit that can produce 4 different outputs based on a single tactile switch click?
I'd like to do this with either a discrete design or a 74373 since ...
- 353
3
votes
3
answers
288
views
Control timing of Monostable Multivibrator
Im having a hard time really understanding a Monostable Multivibrator.
What I'm trying to achieve is being able to control the timing of the vibrator with a microcontroller of some kind. (arduino, pic,...
- 33
4
votes
2
answers
147
views
555 astable resistor location
When looking at example schematics of a 555 astable circuit, they all show the two resistors in series with the C. I'm wondering how this differs from the schematic I've created below;
Here R6 is ...
- 143
0
votes
0
answers
52
views
Astable multivibrator and latch in one
I am trying to design a combined function of oscillator and latch in one circuit to spare parts.
Seems it is working but anyway do you think it is OK or did you see somewhere this circuit?:
simulate ...
- 1,965