One transistor to energise a 24V relay - How?

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chicken_feet

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Hi all,


Is there any way that we can energise a 24V relay using a single transistor from the I/O pin(active low) of a microcontroller (Vcc=5V)?

Thanks.

Best rgds,
chicken_feet
 

Ianp idea is pretty good.. However I would rather use an N-Channel power FET ( with a digital level gate) as they have few advantages over P-channel.
- easier to source than P channel
- more choices of RDS on in small power version.

As you did not mentionned the current required by your relay it is difficult to mention a specific type, but definitely the idea of a FET is exellent.
The internal diode avoid the use of an external one generally needed in a bipolar transistor solution.

Voltages of 80 to 100 volts (Drain - Source) are pretty common today (2005) and not expensive. Therefore you get yourself 'safe' when switching off the relay of the coil voltage produced.
 

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