- Joined Nov 30, 2015
I need to make the output of a light or sound shield stronger to operate a 3 - to -5 volt relay. The shield is small and requires 3 to 5 volts. Really supposed to use 5 volts. I'm hoping 3 volts will do. This project is my robot car I posted about before. The output of this 3 wired shield will not operate the relay. Someone has already told me that I will have to amplify the output. For starters, I don't know if the output is a voltage or a digital signal. I believe it's a voltage. Does an Op-Amp transistor do the trick? And if so, could you show me how. Once I learn this stuff I will never have to ask again. Be Kind and help. Thanks! OK more information about the shield. It can be used with Arduino but is generic brand. It measures, 13.83mm x 32mm.Has a #103 trimmer, 1tiny red power Led, a green Led which lites when sound is (1) detected. A LM393 IC Chip, I believe the chip is a dual Op-Amp or dual voltage chip. The terminals from left to right, DO, GND, Vcc. Senser is on top, neg. on left, pos on right. I replaced the senser with small female jacks. This way I can use any senser I want without soldering the shield. I take it, that shield is just another way of saying electronic PCB board. The shield has 2 "caps" #102 ,(real tiny), before IC and trimmer resistor. After trimmer and IC is 2 # 103/ no letter C next to them. And 2 tiny other electronic rectangular parts unknown to me. All tinny, tiny parts are rectangular in shape. My power source is 3 volts.