Found in Popular Electronics, this sophisticated short-wave receiver requires a lot of skill from an eventual assembler. The coils are commercial types of the time, used in commercial radios.
This circuit found in a European publication from the 1980s, is based on PLL 566. The frequencies...
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
This circuit causes an LED to flash at a frequency determined by capacitor C1. The circuit can be...