Ive read the datasheet, but just to make sure that I wouldnt damage the chip.Īn opamp like the 741 will not operate very well on a single supply.Ĭould I take an 18 volt source and use a voltage divider to get 9 volts and use it as ground so that 0 volts would be -9 volts with respect to ground and then use 18 volts for V with 9 volts with respect to ground.ĭo you want the LEDs to blink crisply on the beats, or vary in brightness with the volume ak. I dont think you could have chosen a worse part for this project. Im sorry if my question seems dumb, but I havent worked with amplifier circuits or audio circuits at all. I checked the audio from the headphone jack with my multimeter and it showed that the voltage was fluctuating from about 0.7 volts to about 0.1 volts. I changed the volume of the radio, but it didnt change anything. Im not entirely sure what the V and V- mean, so I followed the schematic and tried the circuit out by attaching it to a radio. ![]() Im using a UA741CN and I used the circuit found on the website linked below, but I used 9 volts instead of 10 volts.
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