laser-synthitar from a guitar-hero-like toy guitar

Step 4 Build the main pcb

Now build the main circuit, i tested every oscillator with a small speaker before soldering the opamp part. I also used 3 buttons for testing before starting the laser part. I also put them on the outside of the casing for testing if it can be played. The audio signal will be too weak for headphones but it works well on my guitar amp.