This small analog TV transmitter was found in an Electronics Now from the 90s. The range is around 20 meters, and the coils are according to the channel on which you want to receive the signal.
This sequential beacon was found in an 80's Radio Electronics. The circuit can be designed using modern...
The operational amplifier used in this circuit of an old documentation no longer exists, but the...
We found this trebble booster circuit in a 1990 documentation. The components are current, and the...