Is there a way to get 24V in addition to the existing 12V, 5V, and 3.3V outputs from a typical ATX PSU? If so, how?
My existing lab PSU doesn't provide enough power, so I've modified a 600W ATX PSU, and it's now supplying the 24V@1A I need to drive a solenoid between the -12V and +12V leads; however, I'm now at a point where I want to control my solenoid with a digital circuit, so I'm trying to find 5V to control an ATTiny85. Since there's a 12V potential between the negative lead of my solenoid (connected to -12V from PSU) and ground on the PSU, this means I can't just connect the ATTiny to the PSU's ground and 5V leads, right?
I'd imagine there are a few answers to this question, so I'm really looking for a list of options and their tradeoffs. The project I'm working on – a modular pinball platform – is very ambitious (for me), so I'm trying to break it down into manageable tasks, so I can learn along the way.