Im new to electronics and have been trying to devise a cutoff circuit for a 2s 7.4v Lipo Battery. I have found a few places that have the schematics but am unsure as to that parts are needed for a specific layout. see the link bellow.
I have read that a good way is to use the op-amp schematic referenced in the first post. now it shows 2 ICs and im unsure as to if each will be the same TLV431 also is there a way to incorporate a speaker that would sound when the cutoff voltage has been achieved (6.2V)?
parts list that I have come up with is:
TLV431 x 1 (IC1), unknown x 1 (IC2), STP80PF55 x 1(P-channel mosfet), 15k x 1 (R1), 10k-100k? x 1 (R3) How does one figure out what resistor is needed?, R2= R3 x [Vmin/1025 -1]This on im confused of
Any Help will be greatly appreciated!