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OK, I'll try a 7812. Maybe 1.5 amps is ample for normal use and it only needs 2.2 amps in exceptional circumstances such as flashing new firmware or re-tuning. Or maybe the speaker wouldn't go as loud at max volume. The reason I'm making 12v power supply cables is to avoid using an inverter...

Possibly. Hopefully with help from you lot, that'll never happen again, but if it does I'll check for a blown diode before throwing the device in the bin. The original radio was bricked, didn't work on it's mains power supply or any other, so I replaced it with a new one. The Roberts Stream...

Awesome! I'll build & test my reverse-polarity-protection with a bulb or volt meter before connecting the radio. As they cost pennies, I'll get some of each type, try a 1N4001 first, and if that blows then try a 1N5401. Does the diode go between the fuse and the -ve battery terinal? So if that...

I'm using a 12v DC plug that fits the radio, and then a similar 12v DC plug & socket to connect/disconnect from the battery without messing with the terminals. I'll also add a switch and a fuse between the socket and the battery. So if I can get it right first time, and never switch the battery...

12v DC Plug And Socket

12v DC

Good suggestion, I'll add a 3 amp fuse, which as I understand it would protect the battery in the event that my circuit or a connected device short-circuits. So my battery might deliver over 12v and damage the device? What can I do about that? Can I add a component to limit the voltage to a...

Hi How can I connect a 12v radio to a 12v leisure battery without damaging it? I have: - A 12v radio (Roberts Stream 94i) - A connector that fits into the radio power socket - A length of power cable (2 wires) - A soldering iron - A 12v leisure battery - Terminals to connect the wire to the...