Found in a Popular Electronics from the 90s, this circuit uses components that are still current. The circuit triggers the vehicle's horn. The sensors can be increased in number.
Like the previous circuit, this is used in the analog part of the telephone lines. The same...
This analog TV circuit generates bars in the NTSC standard. We found it in the July 1991 issue of...
This transmitter kicks in when the microphone picks up sound. This sound then modulates the signal...