This simple general-purpose transistor mixer was taken from an article in Electronics Now magazine in March 1994. You can choose a low-noise transistor such as the BC549.
This transistorized circuit is powered by a voltage of 6 to 12 V providing high voltage for a neon...
This 6-transistor circuit had excellent sensitivity using germanium transistors. The push-pull stage...
This voltage regulator from STMicroelectronics provides a 1,2 A current in the voltage range from...