I am going to put a digital panel meter on my boat to measure the battery volts and a few other things. For this, I need a DC power supply for the meter with a negative which is below the boat ground. I could easily use a 9V battery and a push button to keep it on just for taking readings. But it would be better and more satisfying to provide a supply, using the boat's 12V power. I have looked for something on the web which can give me 7 to 12V, which is what the meter needs but I only seem to find unsuitable voltages. Has anyone any ideas, please, about a suitable chip for the job (I only need a few mA!)? I am a bit out of touch with this stuff and there must be plenty of solutions if only I could get to them.