request, 12v dc-12v ac power supply Answered
Why? So I can run a pile of 'pro' audio equipment on of a parade float without resorting to a generator or an off the shelf 120vac (barely) inverter.
The equipment I'm talking about is a pair of 4 channel wireless mike receivers (8 mikes total) and a 10 channel mixer. Other input comes from an MP3 player or CD player. We also have an AM/FM/HD radio on board for those long waits in parade linup. The power amp is an automotive (12vdc) unit, 4 x 1000 watts. Main power is a pair of deep-cycle NAPA (optima clone) spiral cell batteries topped-off from the tow vehicle via a charge isolator. There is also an 35watt solar panel (again, for those long lineups) run through the charge isolator. The solar panel maintains the batteries while the float is parked or in storage.
Cracking open the gear we have, every single one of them uses a 10:1 step down transformer to drop 120 vac line to 12vac before dumping it into the mainboard.
It looks like 12vac @ 3 amps will do it for the wireless mike receivers and mixer, but why not shoot for 5 amps to be safe?
Ideally, there would be some serious filtering and regulation/protection on the output. In a Perfect & Ideal world, there would be multiple 12vac outputs each capable of 2 or 3 amps and isolated from each other.
Too much for a request? You never know if you don't ask.
And, in advance, many thanks!