Musical Instrument Automatic Selector Switch

Model AS-3

View of the assembled board with wired jacks.
AS3 automatic ABC selector switch assembled cirtuit board
View of the wiring for the battery box, wall adaptor jack, and output jack.
AS3 automatic ABC selector switch internal view of wiring connections
View of the assembled board up close.
AS4 automatic ABC selector switch assembled printed circuit board

Instead of electrolytic capacitors, I use solid tantalum capacitors. Tantalum capacitors are more expensive than electrolytic capacitors, but have better stability and reliability. The ceramic capacitors are of the higher quality monolithic type.

When I layed out the board I was using JFET transistors in the TO-18 package. Now I am using JFETS in the TO-92 package that are easier to obtain.