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
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