OpAmp/Zener Low Voltage Cut-off Circuit
I haven't worked with opamp components in years(since college which I vaguely recall) however it was suggested to me to use a zener diode and an opamp to build a circuit for my kids' led boxes I built them. I'd like to build a cut-off circuit so that when the battery pack(4.8V NiCd) drops to 4V, the power to the light circuits is shut off and they know when they really need to charge them.
I did some reading last night and watched some youtube videos but this is still lost on me. It was suggested to use a zener diode for the reference voltage as one input and the source voltage as the second input and not use Rf. I was using circuitlab.com to build / test circuits to no avail.
Also saw where folks used mosfets as a switch as well vs an OpAmp.
Can someone please point me in the right direction? Appreciate any input.
Thanks,
somegeek
I haven't worked with opamp components in years(since college which I vaguely recall) however it was suggested to me to use a zener diode and an opamp to build a circuit for my kids' led boxes I built them. I'd like to build a cut-off circuit so that when the battery pack(4.8V NiCd) drops to 4V, the power to the light circuits is shut off and they know when they really need to charge them.
I did some reading last night and watched some youtube videos but this is still lost on me. It was suggested to use a zener diode for the reference voltage as one input and the source voltage as the second input and not use Rf. I was using circuitlab.com to build / test circuits to no avail.
Also saw where folks used mosfets as a switch as well vs an OpAmp.
Can someone please point me in the right direction? Appreciate any input.
Thanks,
somegeek
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