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 circuit uses a switch to select the direction of rotation of a DC motor. It was found in the...
This circuit is from old documentation having a gain of approximately 35 dB at 1 kHz with 2.2 mV...
This traditional triplier configuration with the 555 can be found in other articles on the...