This decorative circuit was found in the July 1994 issue of Electronics Now magazine. It makes LEDs blink in a face-shaped allegory. The frequencies are given by the capacitors in the oscillators.
This small MW transmitter emits its signals at a distance of a few tens of meters, depending on the...
Found in a 90s 303 Circuits, this circuit has an output power of 100 mW. L1 consists of 890 turns...
The coil and sockets of this circuit found in a QST depend on the frequency band that is intended...