The first draft of a modular LM380 “building block” is finished. The schematic and board layout are available on Upverter. The board fits within the 5cm by 5cm size that corresponds to Seeed Studio’s $9.99 fabrication service.
I designed this board with several features in mind:
- Modular design, can be used for prototypes (needs screw holes) or breadboard
- Runs at multiple voltage ranges
- Provide a front-end opamp for modular filtering. Be able to turn bypass the filtering via jumpers.
- Provide on-board space for a potentiometer (Bourns PTV09A-4020F-A103) that faces up for panel mounting.
- There is a 0.1″ headers for using an external potentiometer.
- Provide 0.1″ pins on one edge of the board so that the board can be plugged into a breadboard.