I am building a device that runs on regular batteries and I need to use relays in it. Are there special relays for these sorts of low voltages and currents?
One of the relays needs to close a circuit once the pd in the main circuit is above 2 or 3 volts (main circuit will reach 15 volts on occasion).
I need the other relay to close a switch once the pd gets above 12-14 volts (I have a capaciter charging and I need it a circuit to close when it reaches close to maximum charge). Is there a special relay that I can get that will close a switch at the specified pd of 12-14 volts.
any help much appreciated.
Rupert