This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...
Rapid Prototyping Boards for 32-bit Applications Include Peripherals, Easy-to-use Interface and...
This sound intensity meter was found in a 90s Elektor. The circuit uses an integrated device from...