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 version of the automotive tachometer in a 1980s publication. Variations from other...
This circuit was obtained from American documentation from 1966. It triggers when the two input...
This circuit allows to increase the output power of a 741 as an amplifier. The circuit is from a...