Re: [TANKS] relay switching

2016-02-17 Thread Frank Pittelli 
It's a relatively simple matter to use a transistor to switch a 12V 
relay coil using any voltage over 1.5v. Connect the input signal to the 
transistor base and connect the relay coil to +12V on one side (doesn't 
matter which side) and the other side of the relay coil to transistor 
collector.  Finally, connect the transistor emitter to the common ground 
(tie the ground used by the input voltage to the ground used by the +12V 
source).


*BUT*, it's highly likely that the circuit used in the toy tank 
generates a PWM signal on the lines going to the motors.  That is, one 
of the lines is ground (when going in one direction) and the other line 
is a square wave that oscillates between +3V and ground to regulate the 
speed of the motor.  And, when running in reverse, the lines are 
switched.  Even if the circuit isn't generating a PWM signal, it is 
still switching the polarity of the motor wires for forward and reverse. 
 So, there's no simple re-wiring that would allow you to "upscale" the 
outputs.


You could, however, get a generic H-bridge and then use the output of 
the circuit as the input to the H-bridge.  That solution is probably 
more expensive than you'd like, but it should be possible.


On 2/17/2016 9:47 AM, 'neroc1' via R/C Tank Combat wrote:

I have bought a couple of cheep toy tanks, just out if curiosity really.
they have a 2.4 G TX that takes 2X AA`s and a small 3.7v  lithium in the
tank. Im actually quite impressed with the range/control of the little
fellas. they have a run time of about 20-30 minutes then its a usb
re-charge. they even have a little sound board making tank noises, inc
cannon/ machine gun/ engine.
The only thing that lets these tanks down is the machanical build
quality.the tracks fall off all the time.
What I am wondering is if the electronics could be "up powered" to
trigger 12v relays, I have searched t`interweb for many hours never
finding any clue if a 12v relay can be triggered by a 3.7v source.
Does anybody know of such a relay or solution ?
Much appreciated

Neil R

--
--
You are currently subscribed to the "R/C Tank Combat" group.
To post a message, send email to rctankcombat@googlegroups.com
To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com
Visit the group at http://groups.google.com/group/rctankcombat

---
You received this message because you are subscribed to the Google
Groups "R/C Tank Combat" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to rctankcombat+unsubscr...@googlegroups.com
.
For more options, visit https://groups.google.com/d/optout.


--
--
You are currently subscribed to the "R/C Tank Combat" group.
To post a message, send email to rctankcombat@googlegroups.com
To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com
Visit the group at http://groups.google.com/group/rctankcombat

--- 
You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group.

To unsubscribe from this group and stop receiving emails from it, send an email 
to rctankcombat+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [TANKS] relay switching

2016-02-17 Thread Tyler Porter 
I would have to recommend a  pair of switching transistor circuits, such
that reversing polarity causes a reverse direction, similar to how you
would use them with say an arduino or similar microcontroller, this I
believe might better describe what I'm trying to convey:
https://itp.nyu.edu/physcomp/lessons/electronics/transistors-relays-and-controlling-high-current-loads/
On Feb 17, 2016 9:47 AM, "'neroc1' via R/C Tank Combat" <
rctankcombat@googlegroups.com> wrote:

> I have bought a couple of cheep toy tanks, just out if curiosity really.
> they have a 2.4 G TX that takes 2X AA`s and a small 3.7v  lithium in the
> tank. Im actually quite impressed with the range/control of the little
> fellas. they have a run time of about 20-30 minutes then its a usb
> re-charge. they even have a little sound board making tank noises, inc
> cannon/ machine gun/ engine.
> The only thing that lets these tanks down is the machanical build
> quality.the tracks fall off all the time.
> What I am wondering is if the electronics could be "up powered" to trigger
> 12v relays, I have searched t`interweb for many hours never finding any
> clue if a 12v relay can be triggered by a 3.7v source.
> Does anybody know of such a relay or solution ?
> Much appreciated
>
> Neil R
>
> --
> --
> You are currently subscribed to the "R/C Tank Combat" group.
> To post a message, send email to rctankcombat@googlegroups.com
> To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com
> Visit the group at http://groups.google.com/group/rctankcombat
>
> ---
> You received this message because you are subscribed to the Google Groups
> "R/C Tank Combat" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to rctankcombat+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>

-- 
-- 
You are currently subscribed to the "R/C Tank Combat" group.
To post a message, send email to rctankcombat@googlegroups.com
To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com
Visit the group at http://groups.google.com/group/rctankcombat

--- 
You received this message because you are subscribed to the Google Groups "R/C 
Tank Combat" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to rctankcombat+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[TANKS] relay switching

2016-02-17 Thread 'neroc1' via R/C Tank Combat 
I have bought a couple of cheep toy tanks, just out if curiosity really. 
they have a 2.4 G TX that takes 2X AA`s and a small 3.7v  lithium in the 
tank. Im actually quite impressed with the range/control of the little 
fellas. they have a run time of about 20-30 minutes then its a usb 
re-charge. they even have a little sound board making tank noises, inc 
cannon/ machine gun/ engine. 
The only thing that lets these tanks down is the machanical build 
quality.the tracks fall off all the time. 
What I am wondering is if the electronics could be "up powered" to trigger 
12v relays, I have searched t`interweb for many hours never finding any 
clue if a 12v relay can be triggered by a 3.7v source. 
Does anybody know of such a relay or solution ? 
Much appreciated 

Neil R 

-- 
-- 
You are currently subscribed to the "R/C Tank Combat" group.
To post a message, send email to rctankcombat@googlegroups.com
To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com
Visit the group at http://groups.google.com/group/rctankcombat

--- 
You received this message because you are subscribed to the Google Groups "R/C 
Tank Combat" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to rctankcombat+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.