The FET can be a BF245, and the other transistors can be the BC548 and BC558 in this simple AM receiver. Adjust R4 for the best sound. The coil has 20 + 60 turns of wire 28 in a ferrite rod.
Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the...
The configuration shown was found in an old Poptronics but can be easily assembled using a common...
This circuit, found in a 1977 documentation, indicates when the grid voltage goes through zero....