Re: Need help with Low voltage protection circuit
One of my ideas was to use an off the shelf battery alarm. This circuit is similar to one I built a long time ago, but you can buy the alarm for a couple of dollars. It does not have a relay so I took the circuit and made my own board with a heavy duty 30 amp relay.
![](https://cdn.badcaps-static.com/image_cache/1508ec73da2b430a4386d0e36d7ee364.jpg)
this board is 1.56"x 2.68"x 1.25" not ideal.
I have not ordered any boards made yet, but my test version does work.
The issue is there is no hysteresis and the off and on voltages are almost the same.
I Do not know enough to modify the circuit to get a 1 or 2 volt spread in the on off.
That's why I decided to try the mosfet circuit.
Through hole components are preferred as any one can make it.
One of my ideas was to use an off the shelf battery alarm. This circuit is similar to one I built a long time ago, but you can buy the alarm for a couple of dollars. It does not have a relay so I took the circuit and made my own board with a heavy duty 30 amp relay.
![](https://cdn.badcaps-static.com/image_cache/1508ec73da2b430a4386d0e36d7ee364.jpg)
this board is 1.56"x 2.68"x 1.25" not ideal.
I have not ordered any boards made yet, but my test version does work.
The issue is there is no hysteresis and the off and on voltages are almost the same.
I Do not know enough to modify the circuit to get a 1 or 2 volt spread in the on off.
That's why I decided to try the mosfet circuit.
Through hole components are preferred as any one can make it.
Comment