Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified.
Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output...
The coil consists of 100 turns of wire 28 in a wooden or PVC tube from 2 cm to 2.5 cm in diameter with...
This circuit uses two JFET such as the BF244 or BF245 and has an excellent gain with small...