Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?
I would just take a center-tapped transformer, but the idea is to use a cheap off-the-shelf power brick like the ones you can grab from Goodwill (thrift store) for $1 each. No center taps there...
Thanks,
Michael
Two 12 V zeners in series with a small resistor to pick up the slack.
Tom
Sure. As long as the 24V isn't rounded, use an active circuit to create 'Vcc/2' such as 2 equal value resistors and an op-amp voltage follower configuration. It will give you 0, 12V and 24V. That's essentially the same as -12, 0 , +12.
Graham
Thanks!
I'll study zener diodes more in-depth now.
Michael
I have a feeling this is a home work question!. Ok, How about a Virtual Ground? with a bridge rectifier and filter cap before that? this will give you half of
24 volts for the +&-. You can use a couple of zeners, an op-amp of a simple 2 resistor thingy...Or use 2 half wave output from one side of the tap into
2 different regulators 7812 and 7912 for example. ect. ect..that should give you enough to get you in trouble.
One amp drawn from the 12V side.
Michael
Have something to add? Share your thoughts — no account required.
Ask the community — no account required