This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR not common today.
This circuit was obtained in a 1980 English magazine, but it can be easily assembled today, since...
This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the...
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...