Please help with relay

Nov 22, 2006 5 Replies

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Steven Skindell 19 years ago

I have a 5v 10ma line when hot would like to turn on a relay to turn on a

9.6v motor. ould somebody please tell me how I would accomplish this using a transistor?

Thank you, Steve

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Rich Grise 19 years ago

I've transposted this to news:sci.electronics.basics, which is where it belongs.

Cheers! Rich

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Neil 19 years ago

Your going to need more currrent then that, even a modest telephone

4PDT relay draws more then 30ma on the average. You might consider using optocoupler instead, then some other power source to operate a relay and motor. For a relay transistor, consider part TIP41C for general applications.You can choose smaller transistor, just make sure maximum collector current for the transistor is about 1.5 times over the amount needed for the relay.

Neil

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John Fields 19 years ago

When you say "5V 10mA line", do you mean a 5V line that can supply 10mA into a load when the line is hot or a 5V line that supplies 10mA into an existing load when the line is hot?

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ehsjr 19 years ago

Assuming your line is at 0 volts when "cold" and 5 volts when "hot" :

9.6V ----------------------+----------+ |a | [Diode] | | | +----------+-------+ o | | | | +| [Diode] [RelayCoil] |

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Jan Panteltje 19 years ago

On a sunny day (Thu, 23 Nov 2006 20:15:44 GMT) it happened ehsjr wrote in :

---------------------- +9.6 |+ motor |- |--

0 / 5V ---------| |

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