Controling a 40ma 12volt relay???
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Posts: 46,084
Hi,
Ok real basic electronics question here. It's been too long since I
got out of school and it's showing. Here goes
I'd like to control a 12volt 40 ma relay using a stamp, naturally I
know I'll need a transistor to control the 12v to the relay. I'm
using a PNP (2907). My problem is I'm able to turn the relay on by
applying ground through a 1K resistor that's tied to the base,
however 5v will also turn on the relay. My circuit looks like this.
12v+
Collector
1K
stamp out put
/\/\/\
Base PNP
10K
Ground
/\/\/\\
Emitter
I'm guessing that I need to change the values of my resistors.
I need it so ground turns the relay ON and +5 from the stamp turns
the relay OFF. Vise versa is fine too. I just can't have it doing
what it's doing now and switching on with ground and with +5
Thanks for any help on this
Tim
Ok real basic electronics question here. It's been too long since I
got out of school and it's showing. Here goes
I'd like to control a 12volt 40 ma relay using a stamp, naturally I
know I'll need a transistor to control the 12v to the relay. I'm
using a PNP (2907). My problem is I'm able to turn the relay on by
applying ground through a 1K resistor that's tied to the base,
however 5v will also turn on the relay. My circuit looks like this.
12v+
Collector
1K
stamp out put
/\/\/\
Base PNP
10K
Ground
/\/\/\\
Emitter
I'm guessing that I need to change the values of my resistors.
I need it so ground turns the relay ON and +5 from the stamp turns
the relay OFF. Vise versa is fine too. I just can't have it doing
what it's doing now and switching on with ground and with +5
Thanks for any help on this
Tim
Comments
If you use a PNP the emitter should be tied to 5V, for NPN the emitter is
tied to GND.
The schematic below shows both methods. Values between () for PNP.
+----+
relay power supply + (-)
| |
| |
| |
diode | ---
1N4148 --- | |
/ \ | | relay coil
| | |
| ---
+----}
}
/ collector
1k /
stamp --/\/\/--| NPN (PNP)
base\
\ emitter
|
|
relay power supply - (+)
|
GND (5V)
The NPN is the better option as it shares the GND of the stamp with the - of
the relay.
Hope this helps
regards peter
Oorspronkelijk bericht
Van: timevex@o... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xLDTfHUz6vp5LSyWB5zYXlGHk_ZP0-otzHyUn6MYKFAQtTiXLnwGAoTiqEAOsvI-NaVe_G3k6ppLhG5rTw]timevex@o...[/url
Verzonden: dinsdag 25 september 2001 04:27
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] Controling a 40ma 12volt relay???
Hi,
Ok real basic electronics question here. It's been too long since I
got out of school and it's showing. Here goes
I'd like to control a 12volt 40 ma relay using a stamp, naturally I
know I'll need a transistor to control the 12v to the relay. I'm
using a PNP (2907). My problem is I'm able to turn the relay on by
applying ground through a 1K resistor that's tied to the base,
however 5v will also turn on the relay. My circuit looks like this.
12v+
Collector
1K
stamp out put
/\/\/\
Base PNP
10K
Ground
/\/\/\\
Emitter
I'm guessing that I need to change the values of my resistors.
I need it so ground turns the relay ON and +5 from the stamp turns
the relay OFF. Vise versa is fine too. I just can't have it doing
what it's doing now and switching on with ground and with +5
Thanks for any help on this
Tim
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will switch any load up to about 80 ma.
Original Message
> Ok real basic electronics question here. It's been too long since I
> got out of school and it's showing. Here goes
>
> I'd like to control a 12volt 40 ma relay using a stamp, naturally I
> know I'll need a transistor to control the 12v to the relay. I'm
> using a PNP (2907). My problem is I'm able to turn the relay on by
> applying ground through a 1K resistor that's tied to the base,
> however 5v will also turn on the relay. My circuit looks like this.
stamp, I think it's because I'm switching a higher voltage I'm
switching a 12volt relay with the transistor. I've tried the 2222 as
well.
Tim
--- In basicstamps@y..., Rodent <daweasel@s...> wrote:
> I prefer a 2N2222 -- NPN transistor. That, a small diode and a 10k
resistor
> will switch any load up to about 80 ma.
>
>
Original Message
>
> > Ok real basic electronics question here. It's been too long since
I
> > got out of school and it's showing. Here goes
> >
> > I'd like to control a 12volt 40 ma relay using a stamp, naturally
I
> > know I'll need a transistor to control the 12v to the relay. I'm
> > using a PNP (2907). My problem is I'm able to turn the relay on by
> > applying ground through a 1K resistor that's tied to the base,
> > however 5v will also turn on the relay. My circuit looks like
this.
I'll give this a try, so I don't need a resistor on the emitter or
collector? I'll try this tonight, hopefully it will switch with +5
and GND before it was seeing both +5 and GND as GND and switching the
relay.
Thanks for your help.
Tim
--- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> Hi,
>
> If you use a PNP the emitter should be tied to 5V, for NPN the
emitter is
> tied to GND.
> The schematic below shows both methods. Values between () for PNP.
>
> +----+
relay power supply + (-)
> | |
> | |
> | |
> diode | ---
> 1N4148 --- | |
> / \ | | relay coil
> | | |
> | ---
> +----}
> }
> / collector
> 1k /
> stamp --/\/\/--| NPN (PNP)
> base\
> \ emitter
> |
> |
relay power supply - (+)
> |
> GND (5V)
>
> The NPN is the better option as it shares the GND of the stamp with
the - of
> the relay.
>
> Hope this helps
>
> regards peter
>
>
>
Oorspronkelijk bericht
> Van: timevex@o... [noparse][[/noparse]mailto:timevex@o...]
> Verzonden: dinsdag 25 september 2001 04:27
> Aan: basicstamps@y...
> Onderwerp: [noparse][[/noparse]basicstamps] Controling a 40ma 12volt relay???
>
>
>
>
>
> Hi,
>
>
>
> Ok real basic electronics question here. It's been too long since I
> got out of school and it's showing. Here goes
>
> I'd like to control a 12volt 40 ma relay using a stamp, naturally I
> know I'll need a transistor to control the 12v to the relay. I'm
> using a PNP (2907). My problem is I'm able to turn the relay on by
> applying ground through a 1K resistor that's tied to the base,
> however 5v will also turn on the relay. My circuit looks like this.
>
>
> 12v+
Collector
>
>
> 1K
> stamp out put
/\/\/\
Base PNP
>
>
> 10K
> Ground
/\/\/\\
Emitter
>
> I'm guessing that I need to change the values of my resistors.
>
> I need it so ground turns the relay ON and +5 from the stamp turns
> the relay OFF. Vise versa is fine too. I just can't have it doing
> what it's doing now and switching on with ground and with +5
>
>
> Thanks for any help on this
>
>
> Tim
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@y...
> from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
and it works quite well. A 12-volt relay should work also.
Here is what you do to use a 2N2222:
Connect one of the relay coil leads to +12. Connect the other coil lead to
the collector of the 2N2222. You also need to connect a diode in reverse
bias across the coil of the relay to prevent damaging the transistor. A
1N4001 is fine for this.Ground the emitter of the 2N2222. Both the Stamp
ground and the 12 volt ground need to be tied together. Connect one lead of
a 10k resistor to a Stamp pin, and the other resistor lead to the base of
the 2N2222.
When the Stamp pin is set high, the relay should turn on.
Original Message
From: <timevex@o...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, September 25, 2001 9:47 AM
Subject: [noparse][[/noparse]basicstamps] Re: Controling a 40ma 12volt relay???
> The problem is that it's switching with a high or a low from the
> stamp, I think it's because I'm switching a higher voltage I'm
> switching a 12volt relay with the transistor. I've tried the 2222 as
> well.
> > I prefer a 2N2222 -- NPN transistor. That, a small diode and a 10k
> resistor
> > will switch any load up to about 80 ma.
> >
> >
Original Message
> >
> > > Ok real basic electronics question here. It's been too long since
> I
> > > got out of school and it's showing. Here goes
> > >
> > > I'd like to control a 12volt 40 ma relay using a stamp, naturally
> I
> > > know I'll need a transistor to control the 12v to the relay. I'm
> > > using a PNP (2907). My problem is I'm able to turn the relay on by
> > > applying ground through a 1K resistor that's tied to the base,
> > > however 5v will also turn on the relay. My circuit looks like
> this.
Thanks for your help.
Tim
--- In basicstamps@y..., Rodent <daweasel@s...> wrote:
> Shouldn't be a problem. I switch I/R LED's off a 9 volt supply with
a 2N2222
> and it works quite well. A 12-volt relay should work also.
>
> Here is what you do to use a 2N2222:
>
> Connect one of the relay coil leads to +12. Connect the other coil
lead to
> the collector of the 2N2222. You also need to connect a diode in
reverse
> bias across the coil of the relay to prevent damaging the
transistor. A
> 1N4001 is fine for this.Ground the emitter of the 2N2222. Both the
Stamp
> ground and the 12 volt ground need to be tied together. Connect one
lead of
> a 10k resistor to a Stamp pin, and the other resistor lead to the
base of
> the 2N2222.
>
> When the Stamp pin is set high, the relay should turn on.
>
>
>
>
Original Message
> From: <timevex@o...>
> To: <basicstamps@y...>
> Sent: Tuesday, September 25, 2001 9:47 AM
> Subject: [noparse][[/noparse]basicstamps] Re: Controling a 40ma 12volt relay???
>
>
> > The problem is that it's switching with a high or a low from the
> > stamp, I think it's because I'm switching a higher voltage I'm
> > switching a 12volt relay with the transistor. I've tried the 2222
as
> > well.
>
> > > I prefer a 2N2222 -- NPN transistor. That, a small diode and a
10k
> > resistor
> > > will switch any load up to about 80 ma.
> > >
> > >
Original Message
> > >
> > > > Ok real basic electronics question here. It's been too long
since
> > I
> > > > got out of school and it's showing. Here goes
> > > >
> > > > I'd like to control a 12volt 40 ma relay using a stamp,
naturally
> > I
> > > > know I'll need a transistor to control the 12v to the relay.
I'm
> > > > using a PNP (2907). My problem is I'm able to turn the relay
on by
> > > > applying ground through a 1K resistor that's tied to the base,
> > > > however 5v will also turn on the relay. My circuit looks like
> > this.
Formal schooling was just too long ago and I know the feeling. Add to that
constant change from one aspect of system design to another - almost from
day to day, and we begin to realize the former benefits of having a young
mind.
Here's a nice tutorial that may help yourself in brushing up, or others in
getting acquainted with basic transistor biasing for switching and
amplification:
http://www.mitedu.freeserve.co.uk/Design/bjtbias.htm
:Chris
end towards +12 ?? This keeps the relay from spiking the transistor when the
relay is turned off (the coil on the relay generates a voltage spike as the
magnetic field collapses.)
Original Message
> Ok should like it should work, I'll give it a try tonight.
> > Shouldn't be a problem. I switch I/R LED's off a 9 volt supply with
> a 2N2222
> > and it works quite well. A 12-volt relay should work also.
> >
> > Here is what you do to use a 2N2222:
> >
> > Connect one of the relay coil leads to +12. Connect the other coil
> lead to
> > the collector of the 2N2222. You also need to connect a diode in
> reverse
> > bias across the coil of the relay to prevent damaging the
> transistor. A
> > 1N4001 is fine for this.Ground the emitter of the 2N2222. Both the
> Stamp
> > ground and the 12 volt ground need to be tied together. Connect one
> lead of
> > a 10k resistor to a Stamp pin, and the other resistor lead to the
> base of
> > the 2N2222.
> >
> > When the Stamp pin is set high, the relay should turn on.
same kind of experiments with vacuum tubes also.
Original Message
> Formal schooling was just too long ago and I know the feeling. Add to that
> constant change from one aspect of system design to another - almost from
> day to day, and we begin to realize the former benefits of having a young
> mind.
>
> Here's a nice tutorial that may help yourself in brushing up, or others in
> getting acquainted with basic transistor biasing for switching and
> amplification:
>
> http://www.mitedu.freeserve.co.uk/Design/bjtbias.htm
Just my two cents on this issue I played around with transistors for
a little while and finnally figured it out but I've never been very
fond of the singly packaged transistors. I suggest if your just
interseted in having it work (instead of the workings of electronics)
a Transistor Array in IC form is much easier. I'm quite fond of the
ULN2803a it also has the internal circutry to privide it with the
right logic levels from the stamp. owever this is an NPN device which
means you'll have to attach one end of your relay coil to +12 and the
other to the transistor output.
You can also order free samples from Allegro Microsystems
http://www.allegromicro.com/
circuit that had over 200 large power relays that A/C controlled the power
to individual hotel rooms. They kept blowing out the BJT that powered each
one. That was my painful lesson in the field of collapsing fields with
relays. I got tried of always going to solder in a new transistor, so one
day I suggested that I add diodes to all the relays to prevent this problem,
I did and now they haven't called me for a problem since. Now I'm not making
money from them week after week, I'm not sure what's better. Hehe
Hey thank for all your help on this the circuit works like a charm, before I
had the -12 going into the collector instead of going into the emitter.
Switched it around after getting your advice and it works perfectly.
Tim
Original Message
From: Rodent [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=r-k5NXyELVKGJcoohCXXKPz_QBfeqmZQoh2RpdLR6XkrR2TL23XIE6dluaZzY9G3vxuW2v0VeJeXgw]daweasel@s...[/url
Sent: Tuesday, September 25, 2001 3:42 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: Controling a 40ma 12volt relay???
You understand the diode is hooked up across the relay coil with the banded
end towards +12 ?? This keeps the relay from spiking the transistor when the
relay is turned off (the coil on the relay generates a voltage spike as the
magnetic field collapses.)
Original Message
> Ok should like it should work, I'll give it a try tonight.
> > Shouldn't be a problem. I switch I/R LED's off a 9 volt supply with
> a 2N2222
> > and it works quite well. A 12-volt relay should work also.
> >
> > Here is what you do to use a 2N2222:
> >
> > Connect one of the relay coil leads to +12. Connect the other coil
> lead to
> > the collector of the 2N2222. You also need to connect a diode in
> reverse
> > bias across the coil of the relay to prevent damaging the
> transistor. A
> > 1N4001 is fine for this.Ground the emitter of the 2N2222. Both the
> Stamp
> > ground and the 12 volt ground need to be tied together. Connect one
> lead of
> > a 10k resistor to a Stamp pin, and the other resistor lead to the
> base of
> > the 2N2222.
> >
> > When the Stamp pin is set high, the relay should turn on.
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I'm looking at the pin out for this chip I'm trying to understand how to
wire it up, for a hypothetical 4 relay project. From looking at the diagram
I'm having trouble understanding which of the pins would connect up to the
stamp and how I would connect the coils of the relays. Can you give me a
rough break down (with pin numbers) how I would connect this IC up to
control several loads independently from each other. This chip will work
perfect for a project that I've put on the back burner that has many relays.
Thanks for your help
Tim
Original Message
From: Aaron [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ouFS265tFqZwslLFZUmDJF8RubMZ4vCP6eLgyETF_6nHC0uCJPx5dW-HqlkXRmiGf7sHNj3GKq-jgng]snazzyguy2@y...[/url
Sent: Tuesday, September 25, 2001 8:09 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Controling a 40ma 12volt relay???
Hello;
Just my two cents on this issue I played around with transistors for
a little while and finnally figured it out but I've never been very
fond of the singly packaged transistors. I suggest if your just
interseted in having it work (instead of the workings of electronics)
a Transistor Array in IC form is much easier. I'm quite fond of the
ULN2803a it also has the internal circutry to privide it with the
right logic levels from the stamp. owever this is an NPN device which
means you'll have to attach one end of your relay coil to +12 and the
other to the transistor output.
You can also order free samples from Allegro Microsystems
http://www.allegromicro.com/
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
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high-current LEDs, relays, amplify sensor signals, etc... Everyone should
have a box of 2N2222 transistors and 1N4002 diodes.
Original Message
> Yeah I had that much down. A few years back, I had to add diodes to a guys
> circuit that had over 200 large power relays that A/C controlled the power
> to individual hotel rooms. They kept blowing out the BJT that powered each
> one. That was my painful lesson in the field of collapsing fields with
> relays. I got tried of always going to solder in a new transistor, so one
> day I suggested that I add diodes to all the relays to prevent this
problem,
> I did and now they haven't called me for a problem since. Now I'm not
making
> money from them week after week, I'm not sure what's better. Hehe
>
> Hey thank for all your help on this the circuit works like a charm, before
I
> had the -12 going into the collector instead of going into the emitter.
> Switched it around after getting your advice and it works perfectly.
schematic has an error. The 1N4148 diode needs to have its connections
reversed in the PNP situation.
--- In basicstamps@y..., timevex@o... wrote:
> Peter,
>
>
> I'll give this a try, so I don't need a resistor on the emitter or
> collector? I'll try this tonight, hopefully it will switch with +5
> and GND before it was seeing both +5 and GND as GND and switching
the
> relay.
>
> Thanks for your help.
>
> Tim
>
>
>
>
> --- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> > Hi,
> >
> > If you use a PNP the emitter should be tied to 5V, for NPN the
> emitter is
> > tied to GND.
> > The schematic below shows both methods. Values between () for PNP.
> >
> > +----+
relay power supply + (-)
> > | |
> > | |
> > | |
> > diode | ---
> > 1N4148 --- | |
> > / \ | | relay coil
> > | | |
> > | ---
> > +----}
> > }
> > / collector
> > 1k /
> > stamp --/\/\/--| NPN (PNP)
> > base\
> > \ emitter
> > |
> > |
relay power supply - (+)
> > |
> > GND (5V)
> >
> > The NPN is the better option as it shares the GND of the stamp
with
> the - of
> > the relay.
> >
> > Hope this helps
> >
> > regards peter
> >
> >
> >
Oorspronkelijk bericht
> > Van: timevex@o... [noparse][[/noparse]mailto:timevex@o...]
> > Verzonden: dinsdag 25 september 2001 04:27
> > Aan: basicstamps@y...
> > Onderwerp: [noparse][[/noparse]basicstamps] Controling a 40ma 12volt relay???
> >
> >
> >
> >
> >
> > Hi,
> >
> >
> >
> > Ok real basic electronics question here. It's been too long since
I
> > got out of school and it's showing. Here goes
> >
> > I'd like to control a 12volt 40 ma relay using a stamp, naturally
I
> > know I'll need a transistor to control the 12v to the relay. I'm
> > using a PNP (2907). My problem is I'm able to turn the relay on by
> > applying ground through a 1K resistor that's tied to the base,
> > however 5v will also turn on the relay. My circuit looks like
this.
> >
> >
> > 12v+
Collector
> >
> >
> > 1K
> > stamp out put
/\/\/\
Base PNP
> >
> >
> > 10K
> > Ground
/\/\/\\
Emitter
> >
> > I'm guessing that I need to change the values of my resistors.
> >
> > I need it so ground turns the relay ON and +5 from the stamp turns
> > the relay OFF. Vise versa is fine too. I just can't have it doing
> > what it's doing now and switching on with ground and with +5
> >
> >
> > Thanks for any help on this
> >
> >
> > Tim
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
> Subject and
> > Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
I corrected that error myself by posting a second message directly
after my initial response. Maybe you missed that message.
regards peter
Oorspronkelijk bericht
Van: Fred Davidson [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=z6rz6iIlrZ-LuIJjppN2aZpLrs9JGkwAWLT064xrZsR5qUxeQvR0yRI2hYrnQqT7lRPkreaWzK2OuBZUZJpm]fdavidson@m...[/url
Verzonden: woensdag 26 september 2001 13:30
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] Re: Controling a 40ma 12volt relay???
Since no one else has pointed it out I need to say that Peter's
schematic has an error. The 1N4148 diode needs to have its connections
reversed in the PNP situation.
--- In basicstamps@y..., timevex@o... wrote:
> Peter,
>
>
> I'll give this a try, so I don't need a resistor on the emitter or
> collector? I'll try this tonight, hopefully it will switch with +5
> and GND before it was seeing both +5 and GND as GND and switching
the
> relay.
>
> Thanks for your help.
>
> Tim
>
>
>
>
> --- In basicstamps@y..., "Peter Verkaik" <peterverkaik@b...> wrote:
> > Hi,
> >
> > If you use a PNP the emitter should be tied to 5V, for NPN the
> emitter is
> > tied to GND.
> > The schematic below shows both methods. Values between () for PNP.
> >
> > +----+
relay power supply + (-)
> > | |
> > | |
> > | |
> > diode | ---
> > 1N4148 --- | |
> > / \ | | relay coil
> > | | |
> > | ---
> > +----}
> > }
> > / collector
> > 1k /
> > stamp --/\/\/--| NPN (PNP)
> > base\
> > \ emitter
> > |
> > |
relay power supply - (+)
> > |
> > GND (5V)
> >
> > The NPN is the better option as it shares the GND of the stamp
with
> the - of
> > the relay.
> >
> > Hope this helps
> >
> > regards peter
> >
> >
> >
Oorspronkelijk bericht
> > Van: timevex@o... [noparse][[/noparse]mailto:timevex@o...]
> > Verzonden: dinsdag 25 september 2001 04:27
> > Aan: basicstamps@y...
> > Onderwerp: [noparse][[/noparse]basicstamps] Controling a 40ma 12volt relay???
> >
> >
> >
> >
> >
> > Hi,
> >
> >
> >
> > Ok real basic electronics question here. It's been too long since
I
> > got out of school and it's showing. Here goes
> >
> > I'd like to control a 12volt 40 ma relay using a stamp, naturally
I
> > know I'll need a transistor to control the 12v to the relay. I'm
> > using a PNP (2907). My problem is I'm able to turn the relay on by
> > applying ground through a 1K resistor that's tied to the base,
> > however 5v will also turn on the relay. My circuit looks like
this.
> >
> >
> > 12v+
Collector
> >
> >
> > 1K
> > stamp out put
/\/\/\
Base PNP
> >
> >
> > 10K
> > Ground
/\/\/\\
Emitter
> >
> > I'm guessing that I need to change the values of my resistors.
> >
> > I need it so ground turns the relay ON and +5 from the stamp turns
> > the relay OFF. Vise versa is fine too. I just can't have it doing
> > what it's doing now and switching on with ground and with +5
> >
> >
> > Thanks for any help on this
> >
> >
> > Tim
> >
> >
> >
> >
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