- Joined May 25, 2022
Hello, I'm trying to build a circuit where I need to send a one single input to a keyboard, and then every key on that keyboard has it's own output. So, at that output, each key has a trimmer to control the voltage. (I'm trying to build a 1V per octave analog keyboard). So, in order to be able to activate multiple keys at once without messing up the voltage supplied to each I (presume) need a buffer. The problem is that if I use an op-amp buffer in this case, while I'm not pressing the key, the op-amp sends a higher voltage instead of 0v (which is what I need, the circuit to be at 0v if no key is pressed). So my question is if I can use the SN74HC244N ic instead of an op-amp, and if it would produce that result. Thank you in advance!