You probably won't find such a relay, but you can easily drive a 12v
relay coil from a 3.7v signal using a simple transistor, as shown in the
attached circuit. The specific transistor to be used depends on the max
draw of the relay coil, which is typically less than 1A for inexpensive
12V automotive relays. The flyback diode shown in the circuit
suppresses the reverse-voltage electrical pulse generated by the relay
coil when it is deactivated.
Best of all, transistors and diodes are cheap and they don't go boom if
you wire things wrong ... they just release some magic smoke. So, they
are perfect for teaching basic electronics and soldering. Add an
inexpensive indicator LED and resistor across the relay coil to add user
feedback. Replace the flyback diode by an LED (oriented opposite to the
indicator LED) and you can see the reverse-voltage electrical pulse when
the relay coil is deactivated. A perfect electro-mechanical project for
beginners.
On 4/15/2016 6:57 AM, 'neroc1' via R/C Tank Combat wrote:
I would still like to find a relay that has a coil operating at 3.7v
that actuates a 12v circuit, just for simplicity
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