Need simple 1vdc relay circuit

A

Arcadefreaque

Guest
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

I started this project by using a simple relay circuit controlled by a
serial port of a computer, but now want to move it to the cellular
angle - which gives me much lower power output unless I go with some
sort of bluetooth serial adaptor (which I'm working on as well). For
now though, if anybody has ideas on a simple scenario for a quick
switching relay circuit that would work for this scenario, I'd really
appreciate the assistance.

Thanks
af
 
"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in message
news:GaM5n.1223$CM7.102@newsfe04.iad...
Arcadefreaque wrote:
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

I started this project by using a simple relay circuit controlled by a
serial port of a computer, but now want to move it to the cellular
angle - which gives me much lower power output unless I go with some
sort of bluetooth serial adaptor (which I'm working on as well). For
now though, if anybody has ideas on a simple scenario for a quick
switching relay circuit that would work for this scenario, I'd really
appreciate the assistance.

Thanks
af
Using a basic NPN common emitter mode so that the collector will pull the
load to common. The NPN can then pull a higher voltage load like the low
side of a relay.. The relay can be supplied with what ever voltage is
required up to the rated spec of the NPN.

A 220 Ohm with that voltage drive, should be enough to saturate
a common 2N2222 type transistor..
Click to expand...
I second this.
Don't forget the back EMF diode across the relay.

Tom
 
Arcadefreaque wrote:
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

I started this project by using a simple relay circuit controlled by a
serial port of a computer, but now want to move it to the cellular
angle - which gives me much lower power output unless I go with some
sort of bluetooth serial adaptor (which I'm working on as well). For
now though, if anybody has ideas on a simple scenario for a quick
switching relay circuit that would work for this scenario, I'd really
appreciate the assistance.

Thanks
af
Using a basic NPN common emitter mode so that the collector will pull
Click to expand...
the load to common. The NPN can then pull a higher voltage load like the
low side of a relay.. The relay can be supplied with what ever voltage
is required up to the rated spec of the NPN.

A 220 Ohm with that voltage drive, should be enough to saturate
a common 2N2222 type transistor..
 
On Wed, 20 Jan 2010 18:20:33 -0500, "Tom Biasi" <tombiasi@optonline.net>
wrote:

"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in message
news:GaM5n.1223$CM7.102@newsfe04.iad...
Arcadefreaque wrote:
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.
Click to expand...
---
If you can stand to lose about 0.3V of that 3.6V into the load: (View in
Courier)


Low side driver:

.. +3.6
.. |
.. [LOAD]
.. |
.. C
..1V>--[1K]--B 2N3906
.. E
.. |
.. GND


High side driver:


.. +3.6
.. |
.. +--------+
.. | |
.. [10K] |
.. | E
.. +------B 2N3906
.. | C
.. [1K] |
.. | |
.. C [LOAD]
...1V>---[10K]---B 2N3906 |
.. E |
.. | |
.. +--------+
.. |
.. |
.. GND

JF
 
On Wed, 20 Jan 2010 19:42:43 -0600, John Fields
<jfields@austininstruments.com> wrote:

On Wed, 20 Jan 2010 18:20:33 -0500, "Tom Biasi" <tombiasi@optonline.net
wrote:



"Jamie" <jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote in message
news:GaM5n.1223$CM7.102@newsfe04.iad...
Arcadefreaque wrote:
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

---
If you can stand to lose about 0.3V of that 3.6V into the load: (View in
Courier)


Low side driver:

. +3.6
. |
. [LOAD]
. |
. C
.1V>--[1K]--B 2N3906
. E
. |
. GND


High side driver:


. +3.6
. |
. +--------+
. | |
. [10K] |
. | E
. +------B 2N3906
. | C
. [1K] |
. | |
. C [LOAD]
..1V>---[10K]---B 2N3906 |
. E |
. | |
. +--------+
. |
. |
. GND
Click to expand...
---
Oops...

NPNs should be 2N3904 and the PNP high side load switch could be driven
a little harder:

Low side driver:

.. +3.6
.. |
.. [LOAD]
.. |
.. C
..1V>--[1K]--B 2N3904
.. E
.. |
.. GND


High side driver:


.. +3.6
.. |
.. +--------+
.. | |
.. [10K] |
.. | E
.. +-[1k]-B 2N3906
.. | C
.. | |
.. | |
.. C [LOAD]
..1V>---[10K]---B 2N3904 |
.. E |
.. | |
.. +--------+
.. |
.. GND

JF
 
"Arcadefreaque" <arcadefreaque@gmail.com> wrote in message
news:30f41e1d-4315-41dc-96a0-0a7499e4595b@36g2000yqu.googlegroups.com...
Okay, admittedly I am not that well versed in electronics. I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc. The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

I started this project by using a simple relay circuit controlled by a
serial port of a computer, but now want to move it to the cellular
angle - which gives me much lower power output unless I go with some
sort of bluetooth serial adaptor (which I'm working on as well). For
now though, if anybody has ideas on a simple scenario for a quick
switching relay circuit that would work for this scenario, I'd really
appreciate the assistance.

Thanks
af
Click to expand...
So you're just getting the wires connected to the bomb, then Aunt Emma calls
to tell you her Pekingese threw up on the rose-patterned carpet in the
parlor.
ka-BOOM
 
Thanks for the advice everyone. I'll see what I can piece together
from your recommendations.

And Michael, Aunt Emma has a shitzu, but thanks for the concern.

On Jan 20, 10:32 am, Arcadefreaque <arcadefrea...@gmail.com> wrote:
Okay, admittedly I am not that well versed in electronics.  I can
solder and follow directions well enough to put together some
interesting hacks occasionally, but I'm really a greenie when it comes
to certain aspects.

I'm trying to find a reasonable way to accomplish turning on and off a
device that is powered by about 3.6vdc.  The trigger mechanism would
be a cell phone's vibration motor's power source (motor disconnected)
which outputs somewhere around 1 - 1.3vdc.

I started this project by using a simple relay circuit controlled by a
serial port of a computer, but now want to move it to the cellular
angle - which gives me much lower power output unless I go with some
sort of bluetooth serial adaptor (which I'm working on as well).  For
now though, if anybody has ideas on a simple scenario for a quick
switching relay circuit that would work for this scenario, I'd really
appreciate the assistance.

Thanks
af
Click to expand...
 
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