Switch a 24 volt relay with a 1.5-2.0V signal
Switch a 24 volt relay with a 1.5-2.0V signal
(OP)
Hi,
I'm working on a project where I will need to switch a 24 volt coil voltage relay with a 1.5-2.0V signal. I've read on some threads that you can use a transistor to do this.
Does anyone know the details of this?
Any help will be appreciated. Thanks,
I'm working on a project where I will need to switch a 24 volt coil voltage relay with a 1.5-2.0V signal. I've read on some threads that you can use a transistor to do this.
Does anyone know the details of this?
Any help will be appreciated. Thanks,





RE: Switch a 24 volt relay with a 1.5-2.0V signal
RE: Switch a 24 volt relay with a 1.5-2.0V signal
transistor switch circuit 24v
You'll get 7.8 million results, and lots of the top 50 have example circuits.
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: Switch a 24 volt relay with a 1.5-2.0V signal
How much current can that source provide?
How much current does that relay coil need?
RE: Switch a 24 volt relay with a 1.5-2.0V signal
One resistor on the gate to the 2V signal, plus a resistor to tie the gate to ground when the signal is off, is pretty much all you need to switch the relay coil on/off.
Assuming, of course, that the FET is correclty selected for these voltages and questions such as those posed by OperaHouse are adressed correctly.
STF
RE: Switch a 24 volt relay with a 1.5-2.0V signal
Note that "transistor" is a more general term, since a MOSFET is also a transistor --> metal oxide semiconductor field effect transistor. I think the expectation is that the OP should hire or borrow someone that can help him out.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Switch a 24 volt relay with a 1.5-2.0V signal
There's still a design step required to match the transistor to the requirements, and to choose the optimum resistor value. If this is all small signal work (low power relay), then perhaps a common 2N2222A transistor and 1k resistor would work. If the relay is large and requires moderate current, then you may need help. Post details.
This assumes that your 2v signal can provide enough current to match the current gain of the transistor and the current required by the relay coil.
RE: Switch a 24 volt relay with a 1.5-2.0V signal
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Switch a 24 volt relay with a 1.5-2.0V signal
The above assumes your using the transistor as a common emitter and providing the ground side of the relay coil. If you don't drive the transistor hard enough, it will turn on but be in the active rather than saturation region which means that your ground voltage will be high and the transistor will be dissipating a lot of power, but probably not for very long.
RE: Switch a 24 volt relay with a 1.5-2.0V signal
RE: Switch a 24 volt relay with a 1.5-2.0V signal