This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
This is a common crystal oscillator configuration with 80s transistors. The circuit has the...
This circuit was found in a 90’s RF design. The circuit has an output frequency of approximately 100...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...