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Questions tagged [rheostat]

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0answers
24 views

Q: Unexpected behavior from digital Rheostat

I have no idea whats warranting this behavior from the MCP4162 device Starting from 500mV(pp) - 2.8V(pp) a weird "wave" like distortion happens in between the two voltages. (Towards the negative ...
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1answer
42 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
2
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5answers
251 views

Choosing a rheostat

I have a cartridge heater with the following specs: 50W and 220V AC. I would like to control it with a rheostat, but I am not sure how to pick an appropriate rheostat. Could someone give me a hand?
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2answers
63 views

What would I use to regulate raise/lower temperature in an AC 40 watt device's heating element? [closed]

It's for a resin burner--frankincense etc--that doesn't have a temperature regulator so it burns too hot. I don't need to know an actual temperature, just to be able to raise/lower the temp'. Thanks.
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2answers
100 views

Rheostat replacement resistors with relays

I would like to replace a 500k rheostat with three fixed value resistors. Can I achieve this with the help of 3 sugar cube relays like I've shown in the picture? or is it bad idea? Those relays are ...
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3answers
1k views

0-10V Digital Rheostat for LED Dimmer?

I have an LED light with a power supply that follows the ISO 60929 0-10V standard for dimming. The manufacturer says "the power supply is current sourcing, and is roughly 0.5mA." The following ...
1
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1answer
523 views

Current limiter for homemade arc welder

I'm would like to control the AC current that is will be consumed by a homemade arc welder. Website I used as a reference: http://www.mike-worth.com/2013/07/31/adding-a-current-limiter-to-my-mot-...
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4answers
1k views

Rheostat power rating vs. current rating

I have a 1k ohm rheostat that has a 25W power rating, and a current rating of 0.15 amps. I got it because I was running a 12v/24v circuit at 1amp draw. I just looked at the power rating of 25W and ...
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2answers
651 views

reducing a 12volt fan speed

I bought a 12volt, 80 watt aftermarket fan for a car. What I'm making is a portable swamp cooler for my tent when I move to AZ this summer. I plan to charge a 30 amp, deep discharge trolling motor by ...
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2answers
1k views

Purpose of rheostat in measuring resistance

I was given task to measure the resistance of different length of same conductor to find the relationship between length and resistance. The circuit diagram is something like this: The resistance,R ...
1
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1answer
113 views

What does this denote in the schematic?

I am designing a PCB for a VFD clock I want to build and I have come across something in a schematic for a voltage regulator that I have no idea what it means. I have circled what I do not understand ...
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3answers
1k views

How much power is wasted with a light dimmer?

I have my rotational light dimmer and am wondering the logic behind it. If it is a potentiometer, when fully off, it should be wasting lets say 50V of power if not using a transistor. By logical ...
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1answer
96 views

How to amplify the resistivity range of a rheostat

I have a black box DC to AC inverter with a 5 kΩ linear taper pot wired to it that acts as an LED light dimmer. I have no idea how the circuitry of the black box is composed - it is encased in a ...
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2answers
2k views

Is there any difference between the terminals of the rheostat

This is probably a dumb question but I just wanted to be sure for my practical exams. Is there any difference between the upper or the lower terminal of the rheostat? Are you supposed to connect the ...
22
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2answers
5k views

Why would you short two pins of a potentiometer?

I've found a potentiometer which controls the heat of a cook top. One of the outer pins and the centre pin were shorted with a soldered jumper. Why would someone do that? What does this achieve?