LPT port relay
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Posted by Jasen Betts on September 22, 2008, 7:48 pm
Please log in for more thread options > I am trying to use LPT port to control a small 5 V relay (Meisei ps-5). The
relay
> appears to have 1.75 ohm resistance.
1.75 is too low. 175 or 1.75K possibly? > I connected the data pin to the + pin of the relay and ground to the gnd pin.
No
> click. Voltage drops to about 2V. Then I tried with DC power supply at 4.5V
new
> (1.5A). A nice click is audible from the relay. > > (Bear with me: I am a newbie) I conclude that LPT is not suppliying enough > current (live and learn!). After googling for some time I am presented with a > thing that should: a transistor - as in "transistor radio".
excellent conclusion! > This helpful site has a cirquit that fits the bill:
> http://www.epanorama.net/circuits/parallel_output.html#relaycontrol > here is it: that's the way to di it! > Above need an extra power supply (Vcc). Is any way to use power (perhaps from
> multiple data pins) from the LPT port itself? One pin gives out 0-5V and a few > milliamps. The Meisei relay I have seems to need more. multiple data pins will probably not be enough. you could try pulling a 5V supply from the keyboard (or mouse) socket (pinout here: http://pinouts.ws/ps-2-keyboard-pinout.html ) Bye. Jasen | |||||||||||||||||||||||||
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