We found this circuit in a 1964 Electronic Design. The components are from that time, but the circuit can be made with modern equivalent components.
We found this circuit in a Linear Technology component manual. The circuit also has a DC zeroing...
This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and...
This simple megaphone is from old documentation, but uses still current components. The circuit is...