We found this circuit in the Electronics Experimenter Handbook magazine from 1993. L1 has 2 = 2 turns of 28 or 30 wire in the shape of 0.5 cm without core. The range reaches a few tens of meters.
This receiver is from an old English magazine from 1965. The transistors used are germanium, no...
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
This version is a variation of the previous circuit, inverting the position of the transistors to have the...