This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
This is a shunt circuit to be used on a multimeter, expanding its scales to measure high currents....
This step is also suitable for the AC188k and SK3004 transistors and was found in a 1980s...
This high quality audio preamplifier uses three bipolar transistor and is powered from 24 V...