Hey all! We have to build a simple audio mixer circuit for my electronics class. I've designed the circuit and tested it using EasyEDA.com and it appears to work fine. However, when I built the circuit (rebuilt it twice now) on a breadboard it seems to be outputting a much lower voltage than I am expecting. I've uploaded a pic of the simulated circuit. I used an AC source for each "mic" right now and replicated that in person when I tested it today. With the current settings (0.07V amplitude @ 5kHz), in the sim I get around 10V. In real life I am getting a little under 5V. Does anyone see anything wrong with the schematic in the picture? Is there something I am not seeing? Thank you for helping!
180.6 KB Views: 22
62.9 KB Views: 25