Have built the Seattle Univ cell phone detector to locate hidden harassment devices around my home, especially the auto tracker presently installed somewhere in my car.
Circuit works well, and LED comes on when it receives a cell signal (don't use the buzzer). However, I can't drive and keep an eye on the circuit LED at the same time - especially when investigating the trunk, engine area, and under body as possible hiding places.
So, I'd like to insert a flip flop, SCR?, etc? in line with the LED so when the circuit receives a cell signal and the LED lights up, it will stay lit until I get a chance to look at it, then I'll pull the power and turn it off.
All help welcome - thanks!
seattleu.edu/scieng/ece/LM358_RF_Cell_Phone_Detector.html
https://www.circuitlab.com/circuit/uq4jyh/my-lm358-cell-phone-rf-detector/
Circuit works well, and LED comes on when it receives a cell signal (don't use the buzzer). However, I can't drive and keep an eye on the circuit LED at the same time - especially when investigating the trunk, engine area, and under body as possible hiding places.
So, I'd like to insert a flip flop, SCR?, etc? in line with the LED so when the circuit receives a cell signal and the LED lights up, it will stay lit until I get a chance to look at it, then I'll pull the power and turn it off.
All help welcome - thanks!
https://www.circuitlab.com/circuit/uq4jyh/my-lm358-cell-phone-rf-detector/