Voltage regulator

[Joe2003]

Hey

Im building a sailplane and want to use some old 7.2v lipo packs to power it.

Im building a simple reg circuit with a 7805 to drop the voltage down to 5v, anyway I wanted to included a low voltage warning, (maybe an LED or buzzer). Does anyone have any ideas about how I can do this?

I was thinking about using zener diodes? Does anyone have any plans?

thanks

Joe

[MX]

You can check out the little regulator I made:

http://www.rcgroups.com/forums/showthread.php?t=350829

It uses a little comparator and a couple 1% resistors to turn on an LED below 6.1 volts.

MX

[Acetronics]

Hi, Joe

a very simple and inexpensive :) checker can be done around a MC34065 P5 (TO92 µP reset circuit ) reset IC ; see Datasheet for apps ...

Alain

[poulsbobill]

I use this. http://www.webx.dk/rc/lipoly/low-volt-alarm.htm Can be probably modded for your needs.

Bill

[Acetronics]

Hi,

This one also is fine ...

see bottom of page.

http://www.aeromodelisme-rc.net/electronique.htm

Alain

[HeliEye]

Hey

Im building a sailplane and want to use some old 7.2v lipo packs to power it.

Im building a simple reg circuit with a 7805 to drop the voltage down to 5v, anyway I wanted to included a low voltage warning, (maybe an LED or buzzer). Does anyone have any ideas about how I can do this?

I was thinking about using zener diodes? Does anyone have any plans?

thanks

Joe

Hi Joe.. I wouldn't use the 7805, it's not good from 7.2V when the battery volts drop a bit, use the LM2940CT, this one is a Low dropout type, you'll get better runtime from your 7.2V lipo.

Ah.. spotted MX's regulator uses this reg too :cool:

Steve