relay coils and transistors
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I am trying to operate a 120 VAC relay with a BS2, I have been modelling my project after shaun's at· http://geocities.com/SiliconValley/Orchard/6633/vbonoff.html....my· question· is,· my 5+ relay from R Shack has the +5 relay coils marked as + and -............ so· should the collector leg attach to the + or - ?· Shaun doesnt specify in the schematic.
Thanks,
Dave
Thanks,
Dave
Comments
>project after shaun's at
>http://geocities.com/SiliconValley/Orchard/6633/vbonoff.html....my question
> is, my 5+ relay from R Shack has the +5 relay coils marked as + and
>-............ so should the collector leg attach to the + or - ? Shaun
>doesnt specify in the schematic.
Relays are a non polarised device and it doesn't matter which contact of
the coil is connected to the collector. Make sure you wire the diode
correctly across the coil otherwise you will not have a working
transistor/Basic Stamp for long. ;-)
Regards
Jean-Michel.
> Part 1.1 Type: Plain Text (text/plain)
> Encoding: quoted-printable
it doesn't matter which way but i recomend that you put the - on the
colecter BEWARE!!!! solder a diode with the cathode on the - terminal
and the anode on the + then attach the + of the relay then attach the
collector to the - of the relay and the current to the +
will
Your assertion is *usually* correct, but I've seen relays with a built-in
transient suppression diode. Of course, they must have coil polarity
markings in this case...
>Relays are a non polarised device and it doesn't matter which contact of
>the coil is connected to the collector. Make sure you wire the diode
>correctly across the coil otherwise you will not have a working
>transistor/Basic Stamp for long. ;-)
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!