I am having trouble trying to figure out this design that is being used for a simple indication that a weight is being applied to a peice of equipment. the actual pcb that I have to go off of does not give a good view of where or how it is wired. I can tell you the components that are being used however, which are
2N3906 transistor (2), TIP122 NPN Epitaxial Darlington Transistor, LM358AN Dual Operational Amplifier(2),
HEF4013B dual D-type flip-flop, several BC 104 type capacitors, several resistors. All of this is supposed to read when a load is applied to a set of holders. The use of a plunger type material is what is sending the feedback signal however, I don't understand the use of the shift register, counter, or whatever the flip-flop is being used for so all I know is that when the plungers are depressed the two led's on the pcb will go out according to which plunger activates. I somewhat pieced together an ideal circuit that works this way but with the use of a switch as one of the plungers, however, I get an error after it runs for a while. dont know what is causing that yet and cant figure out why a diode is being used in the plunger along with a transistor. I am attaching the circuit that I built using Multisim. Thanks
