how can i turn a 3 volt current into a 12 volt continuous current to keep a relay switch open? Answered
i am building an r/c tank as some may already know from previous questions, anyway my batteries came in and now i have gone to my local jarcar shop only to find out that the relays i require to run a 12 volt 9 amp current need 12 volts at 150ma to stay open!
but the reciever from a toy rc truck can only supply 6 volts for which the motors run off and another 3 volts for which the servo runs off .
so how can i amplifie this current into 12 volts continuous to keep the relay open?
i know whats needed, the voltage will be doubled but the amphours will be cut in halfe or quarters or whatever the opposit of what is needed to make a 12 volt current. i need to know what it is i need and how to assemble it , i am good with most instructions and im presuming that this should be quite simple and similar to that of a solar powerd sla battery charger.