Found in a 1964 Electronic Design, this circuit generates pulses based on an avalanche diode of the time. The circuit can be tested with modern equivalent components.
We found this circuit in an American 1980s documentation. The transistors can be equivalent as BC548...
Figure 1 shows a hal-wave voltage doubler operating with the Power-supply voltage. Output current...
This preamplifier circuit for turntable cartridges was found in the March 1994 issue of...