I would do a simple boost circuit from the 9V battery up to 24V then stack a pair of 12V zeners across the 24V. Use the center node for circuit ground and you have +/-12V supplies.MOST IMPORTANTLY, how can I get dual polaritys from a single polarity supply? that's what I'm really after here. I can work out the rest later.
A wall wart costs about $2, the price of about one 9V battery. I would use the wall wart unless the device must be portable.Do the items "being powered by the supply as a whole" require 12V? If not, the number of devices being powered will relate to the current requirement (which as already stated isn't much from a 9V battery). As for keeping the cost down by using batteries instead of a wa-wart, have you thought about the on-going cost of constant replacement of the batteries? If this device is to be used for more than the life of 10 batteries, a wal-wart will start to look like a bargain compared to the cost of replacement batteries.
Do the items "being powered by the supply as a whole" require 12V? If not, the number of devices being powered will relate to the current requirement (which as already stated isn't much from a 9V battery). As for keeping the cost down by using batteries instead of a wa-wart, have you thought about the on-going cost of constant replacement of the batteries? If this device is to be used for more than the life of 10 batteries, a wal-wart will start to look like a bargain compared to the cost of replacement batteries.
I have a bunch of warts, but its more a concern of practicality. there is nowhere close or easily accessible to plug this in each time I move my drumset over to play.A wall costs about $2, the price of about one 9V battery. I would use the wall wart unless the device must be portable.
No.The biggest reason for the regulators ( forgot this lastnight) was to simply allow the circuit to be on or off. When the batteries got too low the regulators would cut power, period.
No, they don't unless you add some level detecting comparators and also have IC regulators that have ON/OFF pin capability.I'm pickin' up what you're layin' down
Maybe I'll just stick with 2x9v batteries, but I wanted to find a solution to the problem of the battieries getting low and causing the circuit to go nuts.
The biggest reason for the regulators ( forgot this lastnight) was to simply allow the circuit to be on or off. When the batteries got too low the regulators would cut power, period.
by Duane Benson
by Jake Hertz
by Duane Benson