The transistor can be a BC548 and the coil has the following characteristics for 1 MHz. L1 has 80 turns of wire 28 in a ferrite rod and L2 of 30 and 40 turns.
We found this circuit in an old documentation from the 70s. Its purpose is to indicate the...
Based on the CA3140 IC, this circuit was found in the June 1986 issue of Radio Electronics....
We found this circuit in documentation from the 1980s. It is an input stage for a digital...