I need to build regulator boards for my students to use with their solderless BB's. They will wire chips in backwards and create shorts, this is a given.
Here is what I have in mind. It would provide 5V at 100ma, 500ma, and 1 Amp if the wall wart is up to it.
Brick/wart connects to regulator using screw terminals.
Just after the terminal block a diode to prevent problems when the brick is hooked up backwards. Maybe setup a red LED to indicate this conditon.
Two regulators.
The first will be a LM2931AZ50R .1 amp 5V regulator with reverse voltage and short protection. This regulator will be used when 100 ma is enough, or during initial testing lto ensure there are no shorts or chips in backwards.
The second will be a generic 7805 regulator with 1 amp and .5 amp PTC fuse on the input side. A jumper block selects which of the 2 fuses powers the regulator.
Maybe have the 100ma output sperate from the other. One could use the 100ma source for logic and the other for motors or LEDs.
Suggestion or comments ?
3v0
Here is what I have in mind. It would provide 5V at 100ma, 500ma, and 1 Amp if the wall wart is up to it.
Brick/wart connects to regulator using screw terminals.
Just after the terminal block a diode to prevent problems when the brick is hooked up backwards. Maybe setup a red LED to indicate this conditon.
Two regulators.
The first will be a LM2931AZ50R .1 amp 5V regulator with reverse voltage and short protection. This regulator will be used when 100 ma is enough, or during initial testing lto ensure there are no shorts or chips in backwards.
The second will be a generic 7805 regulator with 1 amp and .5 amp PTC fuse on the input side. A jumper block selects which of the 2 fuses powers the regulator.
Maybe have the 100ma output sperate from the other. One could use the 100ma source for logic and the other for motors or LEDs.
Suggestion or comments ?
3v0
Last edited: