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Controlling the flow of current

dknguyen

Well-Known Member
Most Helpful Member
A diode doesn't control the direction of current. It just only lets current flow one way.

But there are other devices that do only allow current to flow one way through them. You can wire up a MOSFETs to do something similar. This is often used for reverse-polarity protection where the voltages are so low that a diode voltage drop cannot be tolerated. Diacs and thyristors also only let current flow in one direction (but has other quirks).

What are you trying to do?
 

rjenkinsgb

Well-Known Member
Most Helpful Member
Can you control the direction of current with something other than a diode?
Depending what you mean by that, there are multiple different ways with different types of devices.

eg. Controlling a motor to run one way or the other, using switch contacts or relays:
https://www.modmypi.com/image/catalog/tutorials/relay-motors/diagram.jpg

Or the same principle using transistors:
https://electrosome.com/wp-content/uploads/2012/05/H-Bridge-DC-Motor-Driver-using-Transistors.png
 

gophert

Well-Known Member
Most Helpful Member
Back to the OP's question, and your correction of the OP and your proposed solution, "MOSFET".
A diode doesn't control the direction of current. It just only lets current flow one way.

But there are other devices that do only allow current to flow one way through them. You can wire up a MOSFETs to do something similar.
I was assuming the OP had an AC power source and was looking for an alternative to a diode to, as you put it, "let current flow one way". I was hoping you would show how your answer, "MOSFET" replaces a diode in a circuit that needs a diode.
 

JimB

Super Moderator
Most Helpful Member
I was hoping you would show how your answer, "MOSFET" replaces a diode in a circuit that needs a diode.
Ambiguous questions give rise to ambiguous answers.

Don't lose any sleep over it.

JimB
 

AnalogKid

Well-Known Member
Most Helpful Member
Can you control the direction of current with something other than a diode?
Yes. Any semiconducting device can do this; it is the definition of a semiconductor. Examples include a FET (of any flavor), a bipolar transistor, a vacuum tube, and a klystron.

ak
 

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