multi-volt mod

[cpcp68]

Hi everybody,

I took hoogie76's inspiration of using a regulator with shutdown pin to bypass the need for a high current switch and a MOS and I elaborated on it a little bit. I came up with this schematic that implements just that and allows for different voltages at the touch of a switch (or rather by operating a rotary switch, for example). Here it is for everyone interested in using it and experimenting on it. I have no time for the implementation, so I will enjoy any feedback you guys might have when testing.

There are a few things that can be modified, for example, replacing the switch with a potentiometer (and a series resistor) to allow for continuous voltage regulation and so on.

If similar things were presented before, my apologies to the designers: I have been lazy enough not to go and look around.

Anyway, here it is. Please enjoy responsibly!

cpcp68

 

[j0ker]

Nice work. I may give that a try!

 

[cpcp68]

Thanks. If you do, pls send me pictures.

 

[Charged]

Nice job cpcp68,
Nice clean schematic as well.
Most of those tactile switches are rated at 50ma maximum.
If you have (2) 3.7V bats fully charged that would be 8.4V meaning the switch would see 84ma. Seems as though more like 620 ohms to ground would be a better choice? At battery minimum of 6.4V you would be switching 10ma and at battery full you would be switching 13ma. Just throwing it out there since you did mention the tactile switch bonus.

 

[cpcp68]

Right you are! I was thinking about this on my way home. I did not see the spec for the leakage current at the shutdown pin, but anything that will not drop more than ~150mV will work fine.
Thanks.

 

[cpcp68]

Nice job cpcp68,
Nice clean schematic as well.

Thanks for this too, but I do not deserve it. I was just lucky enough to learn from the best.

 

[bigozone]

Thanks for this too, but I do not deserve it. I was just lucky enough to learn from the best.

i used to live down there in the western hills area,, and i really miss having a local supplier like shields electronics... it was like having a mini digi key outlet just a few miles from the house....

those were good days.