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How to control the output voltage of a solid state relay
Creating DPDT Solid State Relay with FETsSolid state relay not turning on motor as expectedSelecting Solid State RelaySolid State Relay Voltage When OffSolid State Relay/Driver QuestionSizing Resistors for Voltage Divider Circuit Feeding Solid-State RelayCan a Solid-State Relay Control AC Powered Fan Speed Via PWM25A SIP Solid State Relay QuestionSolid state relay does not resetHow to improve flash time on lights controlled by solid-state relay via Arduino?
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margin-bottom:0;
$begingroup$
Considering this solid state relay:
![SSR[1]](https://i.stack.imgur.com/2aNWZ.png)
The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage?
What I need is a voltage regulator that can be controlled from a Raspberry Pi in order to control the speed of a fan. Currently, I use something as below that works as expected.
I am completely new in electrical engineering, so please be kind with me...
voltage-regulator solid-state-relay
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
$endgroup$
add a comment
|
$begingroup$
Considering this solid state relay:
The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage?
What I need is a voltage regulator that can be controlled from a Raspberry Pi in order to control the speed of a fan. Currently, I use something as below that works as expected.
I am completely new in electrical engineering, so please be kind with me...
voltage-regulator solid-state-relay
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
$endgroup$
4
$begingroup$
A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
$endgroup$
– Oldfart
Sep 13 at 12:59
5
$begingroup$
The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
$endgroup$
– Transistor
Sep 13 at 16:38
1
$begingroup$
@Transistor How can that be? It has the CE mark of quality! </sarcasm>
$endgroup$
– Harper - Reinstate Monica
Sep 14 at 3:54
add a comment
|
$begingroup$
Considering this solid state relay:
The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage?
What I need is a voltage regulator that can be controlled from a Raspberry Pi in order to control the speed of a fan. Currently, I use something as below that works as expected.
I am completely new in electrical engineering, so please be kind with me...
voltage-regulator solid-state-relay
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
$endgroup$
Considering this solid state relay:
The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage?
What I need is a voltage regulator that can be controlled from a Raspberry Pi in order to control the speed of a fan. Currently, I use something as below that works as expected.
I am completely new in electrical engineering, so please be kind with me...
voltage-regulator solid-state-relay
voltage-regulator solid-state-relay
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
edited Sep 13 at 17:04
C. Lange
8801 gold badge5 silver badges18 bronze badges
8801 gold badge5 silver badges18 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
asked Sep 13 at 12:52
albaralbar
1313 bronze badges
1313 bronze badges
4
$begingroup$
A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
$endgroup$
– Oldfart
Sep 13 at 12:59
5
$begingroup$
The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
$endgroup$
– Transistor
Sep 13 at 16:38
1
$begingroup$
@Transistor How can that be? It has the CE mark of quality! </sarcasm>
$endgroup$
– Harper - Reinstate Monica
Sep 14 at 3:54
add a comment
|
4
$begingroup$
A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
$endgroup$
– Oldfart
Sep 13 at 12:59
5
$begingroup$
The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
$endgroup$
– Transistor
Sep 13 at 16:38
1
$begingroup$
@Transistor How can that be? It has the CE mark of quality! </sarcasm>
$endgroup$
– Harper - Reinstate Monica
Sep 14 at 3:54
4
4
$begingroup$
A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
$endgroup$
– Oldfart
Sep 13 at 12:59
$begingroup$
A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
$endgroup$
– Oldfart
Sep 13 at 12:59
5
5
$begingroup$
The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
$endgroup$
– Transistor
Sep 13 at 16:38
$begingroup$
The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
$endgroup$
– Transistor
Sep 13 at 16:38
1
1
$begingroup$
@Transistor How can that be? It has the CE mark of quality! </sarcasm>
$endgroup$
– Harper - Reinstate Monica
Sep 14 at 3:54
$begingroup$
@Transistor How can that be? It has the CE mark of quality! </sarcasm>
$endgroup$
– Harper - Reinstate Monica
Sep 14 at 3:54
add a comment
|
3 Answers
3
active
oldest
votes
$begingroup$
I think you've misunderstood how a solid-state relay works.
- The coil, or input, will work on 3 to 32 VDC.
- The contacts, or output, are rated for 24 to 380 VAC.
- When the "coil" receives its required voltage (SW1 closes below) it closes the internal "contact". In a normal relay, this is an electromechanical process. In an SSR it is an electronic process. Either way, this keeps both sides isolated from each other.
General Relay Diagrams:
simulate this circuit – Schematic created using CircuitLab
The voltage that the coil operates on and the voltage at the output depend on what voltage you feed into either side. There is no conversion going on in a relay. It is just a switch. I wouldn't suggest using what you've displayed as the main component of a voltage regulator.
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
$endgroup$
add a comment
|
$begingroup$
A Solid-State Relay (SSR) is just that: a solid-state (semiconductor) version of a relay. A relay is an electro-mechanical switch that either connects or disconnects contacts together under control of an electro-magnet within it.
So your SSR is an on-off switch.
Unlike an electro-mechanical relay, it has no moving parts or electro-magnet. Its functions are carried out by solid-state components. It has a lot of benefits over an electro-mechanical relays. One useful to its applications is that the contacts cannot spark as they open or close because there are no contacts or moving parts.
And yours is only for use on AC voltages between 24 Vac and 380 Vac. If you pass DC through it, it can switch its contacts on but can't switch them off. The DC supply would have to be removed elsewhere.
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
$endgroup$
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
add a comment
|
$begingroup$
You may misunderstand how fans work
You need to check the spec sheet on the fan in question, but a great many fans do not regulate speed rheostatically. In fact, in residential wiring a very common mistake is to try to control fan speed with a lamp dimmer, which is itself not rheostatic and is a triac leading-edge or trailing-edge device.
You should be using a fan speed control which is compatible with the type of fan. For instance some fans have several wires going into a multi-position switch (e.g. The "pull the chain for the next speed" types). Others want a fan speed control. Yet others want variable frequency drive.
"How does a consumer/residential fan speed control work" might be a good question.
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
$endgroup$
1
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
add a comment
|
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
I think you've misunderstood how a solid-state relay works.
- The coil, or input, will work on 3 to 32 VDC.
- The contacts, or output, are rated for 24 to 380 VAC.
- When the "coil" receives its required voltage (SW1 closes below) it closes the internal "contact". In a normal relay, this is an electromechanical process. In an SSR it is an electronic process. Either way, this keeps both sides isolated from each other.
General Relay Diagrams:
simulate this circuit – Schematic created using CircuitLab
The voltage that the coil operates on and the voltage at the output depend on what voltage you feed into either side. There is no conversion going on in a relay. It is just a switch. I wouldn't suggest using what you've displayed as the main component of a voltage regulator.
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
$endgroup$
add a comment
|
$begingroup$
I think you've misunderstood how a solid-state relay works.
- The coil, or input, will work on 3 to 32 VDC.
- The contacts, or output, are rated for 24 to 380 VAC.
- When the "coil" receives its required voltage (SW1 closes below) it closes the internal "contact". In a normal relay, this is an electromechanical process. In an SSR it is an electronic process. Either way, this keeps both sides isolated from each other.
General Relay Diagrams:
simulate this circuit – Schematic created using CircuitLab
The voltage that the coil operates on and the voltage at the output depend on what voltage you feed into either side. There is no conversion going on in a relay. It is just a switch. I wouldn't suggest using what you've displayed as the main component of a voltage regulator.
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
$endgroup$
add a comment
|
$begingroup$
I think you've misunderstood how a solid-state relay works.
- The coil, or input, will work on 3 to 32 VDC.
- The contacts, or output, are rated for 24 to 380 VAC.
- When the "coil" receives its required voltage (SW1 closes below) it closes the internal "contact". In a normal relay, this is an electromechanical process. In an SSR it is an electronic process. Either way, this keeps both sides isolated from each other.
General Relay Diagrams:
simulate this circuit – Schematic created using CircuitLab
The voltage that the coil operates on and the voltage at the output depend on what voltage you feed into either side. There is no conversion going on in a relay. It is just a switch. I wouldn't suggest using what you've displayed as the main component of a voltage regulator.
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
$endgroup$
I think you've misunderstood how a solid-state relay works.
- The coil, or input, will work on 3 to 32 VDC.
- The contacts, or output, are rated for 24 to 380 VAC.
- When the "coil" receives its required voltage (SW1 closes below) it closes the internal "contact". In a normal relay, this is an electromechanical process. In an SSR it is an electronic process. Either way, this keeps both sides isolated from each other.
General Relay Diagrams:
simulate this circuit – Schematic created using CircuitLab
The voltage that the coil operates on and the voltage at the output depend on what voltage you feed into either side. There is no conversion going on in a relay. It is just a switch. I wouldn't suggest using what you've displayed as the main component of a voltage regulator.
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
edited Sep 13 at 20:31
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
answered Sep 13 at 12:57
C. LangeC. Lange
8801 gold badge5 silver badges18 bronze badges
8801 gold badge5 silver badges18 bronze badges
add a comment
|
add a comment
|
$begingroup$
A Solid-State Relay (SSR) is just that: a solid-state (semiconductor) version of a relay. A relay is an electro-mechanical switch that either connects or disconnects contacts together under control of an electro-magnet within it.
So your SSR is an on-off switch.
Unlike an electro-mechanical relay, it has no moving parts or electro-magnet. Its functions are carried out by solid-state components. It has a lot of benefits over an electro-mechanical relays. One useful to its applications is that the contacts cannot spark as they open or close because there are no contacts or moving parts.
And yours is only for use on AC voltages between 24 Vac and 380 Vac. If you pass DC through it, it can switch its contacts on but can't switch them off. The DC supply would have to be removed elsewhere.
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
$endgroup$
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
add a comment
|
$begingroup$
A Solid-State Relay (SSR) is just that: a solid-state (semiconductor) version of a relay. A relay is an electro-mechanical switch that either connects or disconnects contacts together under control of an electro-magnet within it.
So your SSR is an on-off switch.
Unlike an electro-mechanical relay, it has no moving parts or electro-magnet. Its functions are carried out by solid-state components. It has a lot of benefits over an electro-mechanical relays. One useful to its applications is that the contacts cannot spark as they open or close because there are no contacts or moving parts.
And yours is only for use on AC voltages between 24 Vac and 380 Vac. If you pass DC through it, it can switch its contacts on but can't switch them off. The DC supply would have to be removed elsewhere.
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
$endgroup$
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
add a comment
|
$begingroup$
A Solid-State Relay (SSR) is just that: a solid-state (semiconductor) version of a relay. A relay is an electro-mechanical switch that either connects or disconnects contacts together under control of an electro-magnet within it.
So your SSR is an on-off switch.
Unlike an electro-mechanical relay, it has no moving parts or electro-magnet. Its functions are carried out by solid-state components. It has a lot of benefits over an electro-mechanical relays. One useful to its applications is that the contacts cannot spark as they open or close because there are no contacts or moving parts.
And yours is only for use on AC voltages between 24 Vac and 380 Vac. If you pass DC through it, it can switch its contacts on but can't switch them off. The DC supply would have to be removed elsewhere.
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
$endgroup$
A Solid-State Relay (SSR) is just that: a solid-state (semiconductor) version of a relay. A relay is an electro-mechanical switch that either connects or disconnects contacts together under control of an electro-magnet within it.
So your SSR is an on-off switch.
Unlike an electro-mechanical relay, it has no moving parts or electro-magnet. Its functions are carried out by solid-state components. It has a lot of benefits over an electro-mechanical relays. One useful to its applications is that the contacts cannot spark as they open or close because there are no contacts or moving parts.
And yours is only for use on AC voltages between 24 Vac and 380 Vac. If you pass DC through it, it can switch its contacts on but can't switch them off. The DC supply would have to be removed elsewhere.
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
edited Sep 13 at 13:11
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
answered Sep 13 at 13:05
TonyMTonyM
9,7281 gold badge15 silver badges34 bronze badges
9,7281 gold badge15 silver badges34 bronze badges
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
add a comment
|
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
3
3
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
Thanks for the lessons. I understand now my naivety.
$endgroup$
– albar
Sep 13 at 13:31
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
$begingroup$
OOI, Can you shed some light on how to understand the rated minimum voltage? Surely when the relay is "closed", the voltage ought to be close to 0. Does the minimum mean that the "open" relay might start to conduct if there is not sufficient voltage across it?
$endgroup$
– Henning Makholm
Sep 14 at 18:23
add a comment
|
$begingroup$
You may misunderstand how fans work
You need to check the spec sheet on the fan in question, but a great many fans do not regulate speed rheostatically. In fact, in residential wiring a very common mistake is to try to control fan speed with a lamp dimmer, which is itself not rheostatic and is a triac leading-edge or trailing-edge device.
You should be using a fan speed control which is compatible with the type of fan. For instance some fans have several wires going into a multi-position switch (e.g. The "pull the chain for the next speed" types). Others want a fan speed control. Yet others want variable frequency drive.
"How does a consumer/residential fan speed control work" might be a good question.
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
$endgroup$
1
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
add a comment
|
$begingroup$
You may misunderstand how fans work
You need to check the spec sheet on the fan in question, but a great many fans do not regulate speed rheostatically. In fact, in residential wiring a very common mistake is to try to control fan speed with a lamp dimmer, which is itself not rheostatic and is a triac leading-edge or trailing-edge device.
You should be using a fan speed control which is compatible with the type of fan. For instance some fans have several wires going into a multi-position switch (e.g. The "pull the chain for the next speed" types). Others want a fan speed control. Yet others want variable frequency drive.
"How does a consumer/residential fan speed control work" might be a good question.
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
$endgroup$
1
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
add a comment
|
$begingroup$
You may misunderstand how fans work
You need to check the spec sheet on the fan in question, but a great many fans do not regulate speed rheostatically. In fact, in residential wiring a very common mistake is to try to control fan speed with a lamp dimmer, which is itself not rheostatic and is a triac leading-edge or trailing-edge device.
You should be using a fan speed control which is compatible with the type of fan. For instance some fans have several wires going into a multi-position switch (e.g. The "pull the chain for the next speed" types). Others want a fan speed control. Yet others want variable frequency drive.
"How does a consumer/residential fan speed control work" might be a good question.
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
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You may misunderstand how fans work
You need to check the spec sheet on the fan in question, but a great many fans do not regulate speed rheostatically. In fact, in residential wiring a very common mistake is to try to control fan speed with a lamp dimmer, which is itself not rheostatic and is a triac leading-edge or trailing-edge device.
You should be using a fan speed control which is compatible with the type of fan. For instance some fans have several wires going into a multi-position switch (e.g. The "pull the chain for the next speed" types). Others want a fan speed control. Yet others want variable frequency drive.
"How does a consumer/residential fan speed control work" might be a good question.
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
answered Sep 14 at 3:52
Harper - Reinstate MonicaHarper - Reinstate Monica
8,44711 silver badges33 bronze badges
8,44711 silver badges33 bronze badges
1
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Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
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– albar
Sep 15 at 9:12
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@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
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– Harper - Reinstate Monica
Sep 15 at 15:28
add a comment
|
1
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
1
1
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
Thank you for your answer. However my fan speed is currently perfectly controlled by a manual voltage variator (as shown in my question). I just want the same thing, but driven by a Raspberry Pi, not by hand. I think I will use a digital potentiometer.
$endgroup$
– albar
Sep 15 at 9:12
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
$begingroup$
@albar "It works" doesn't mean it's right. Lots of things work which are unsafe, especially if the electrical is AC mains.
$endgroup$
– Harper - Reinstate Monica
Sep 15 at 15:28
add a comment
|
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A relay is an on/off switch. (Have a look in Wikipedia under 'relay'.) Theoretically you could control a fan speed by switching in on/or off fast (or slow) but that is not the right way to control a fan. I strongly suggest you do not use it for fan control.
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– Oldfart
Sep 13 at 12:59
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The "FOTEK" unit in the photo is a fake. See protosupplies.com/….
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– Transistor
Sep 13 at 16:38
1
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@Transistor How can that be? It has the CE mark of quality! </sarcasm>
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– Harper - Reinstate Monica
Sep 14 at 3:54