Single Chip Theremin Circuit

 This schematic diagram show a single chip Theremin circuit.  Theremin is an electronic music instrument which sense hand movement to control the tones/frequency. This Theremin circuit uses two separate Colpitts LC oscillators to produce a beat frequency. The frequencies of  two Colpitts LC oscillators are mixed and then rectified.

RJ45 Port Pinout Circuit

 

RJ45 connector is used for connecting Ethernet port on computer and in Internet system. There are two configuration: straight and cross. This is the figure of the RJ45 connector;