Questions tagged [variable]
The variable tag has no summary.
139 questions
3 votes
3 answers
723 views
Voltage-Controlled 555 Timer?
I'm attempting to create a 555 timer oscillator circuit, in which the rising and falling delays of the generated clock signal are independently controlled by two analog input signals. As an initial ...
- 587
0 votes
1 answer
106 views
Switching between two voltage sources (one stable, one variable) with rise/attack and fall/release controls (using momentary control)
I am looking to better refine a design I have for a circuit that switches between two voltage sources: one stable (3V) and one variable (1V-5V), and I would like to be able to control the rise/attack ...
4 votes
4 answers
506 views
Circuit with Resistance Inversely Proportional to Square of Input Voltage?
Is it possible to design a circuit that acts like a resistor, but whose resistance is inversely proportional to the square of the voltage supplied at the input? This circuit would have one input and ...
- 587
-1 votes
1 answer
188 views
What type of potentiometer is this?
The value of a rotatory potentiometer is 1K. It is connected to a 5.1V power supply. The output values from centre of potetntiometer with respect to the angle are given below: 70° - 1 V 145° - 2.04 ...
- 513
0 votes
0 answers
145 views
Improve TPS54331 Buck Converter layout?
I have been working on a design for a surface mount practice kit for electronics students. I am a trained E tech, have a minor in EE and BS/MS in ECE with a focus on opto-electronics so PSU and PCB ...
- 59
0 votes
4 answers
201 views
Designing a variable negative output voltage converter with low ripple
I want to design a variable output regulator to convert 12V to -10V to 0V @1.5A. My idea is to convert 12V to -10V using an LTC7149: I have 40mV ripple at 1.5A. I need to reduce this ripple as much ...
- 1,438
1 vote
2 answers
311 views
Variable Analog Multiplier (Resistor Values, Concepts)
Is there a way to create a variable analog multiplier using conventional op amps? I've been trying to wrap my head around analog multipliers, and I haven't been able to come up with a reliable answer ...
2 votes
1 answer
79 views
Can an amplifier's slew rate vary based on input voltage? (Cathode Ray Tube display)
I have for several years now been interested in CRT (Cathode Ray Tube) displays and the science behind them. I do not have a large amount of electrical engineering experience, but I've learned enough ...
- 21
0 votes
2 answers
111 views
random interval pulse for triggering sound effect [closed]
I am working on a small project using a cheap chinese MP3 player module, that can be triggered to play an mp3 by just sending it a pulse on one of its inputs. The modules are of this type: https://nl....
- 1
0 votes
1 answer
113 views
Ladder logic for multi stage motor setup
I have three motors connected to a high pressure misting system. One motor is variable and is sized about 20% larger than the other two motors. They are on-off motors. All three motors work in tandem ...
- 47
0 votes
2 answers
159 views
Are variable capacitors compatible with breadboards still available?
Variable capacitors are used less, since the preference is for digital adjustment. And through hole parts are used for less, since the preference is for SMD. Finally, many variable capacitors have ...
- 1,379
2 votes
3 answers
1k views
Are there large-range variable capacitors?
I want to use a variable non-polarized capacitor which can vary between 10 pF to 1 μF, or at least up to 100 nF. I can only find trimming caps which can only go up to 100 pF. Am I looking for ...
- 1,622
0 votes
0 answers
89 views
Automatically Vary LFO Speed Resistance Value
I have a basic tone generator circuit with LFO speed controlled by a 50K pot (variable resistor). I would like this resistance to fall (or rise, but I guess fall might be easier) after the circuit has ...
- 1
1 vote
0 answers
86 views
Symmetric PCh and NCh MOSFETs for variable resistors
I'm wanting to build a variable voltage-controlled resistor. The resistor would be in series with a 200 uA AC current source and need to be controllable between 1-20 ohm. My current plan is to take ...
- 11
0 votes
1 answer
93 views
Which one would be easier DC to DC or AC to DC [closed]
I have 440V 3 phase power that will be full wave rectified to 600V DC. My question is, would I be better off plucking one of the phases and rectifying the 120V AC to 12V DC or one of the DC rectified ...
- 1