BTTF Spectrum Analyzer Display Prototype Qe-50

Back To The Future Spectrum Analyzer Display By Bruce F. Coulombe of This is my best work to date. One year in the making Professionally etched circuit board, Real Time response, Flicker control, microprocessor, Touch sensor to select between bar and dot modes. Built-in Demo Display Mode for continuous repeat playback display. Comes with the aluminum silver enclosure, one red aviators oxygen bottle, two elbow connectors, gain control, select switch for either audio inline input with