This non-inverting comparator was found in old American documentation. Formulas next to the diagram allow you to calculate the components for the desired performance.
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...