This 3-transistor buzzer or buzzer is a classic type found in the July 1998 issue of Electronics Now magazine. The power rating depends on the output transistor.
This filter can be used to eliminate hum in sound equipment. Operational amplifiers can be 741 and...
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...
This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon...