We found this circuit in a 1971 documentation. The circuit can be assembled with more modern transistors such as BC548 for Q1, BC558 for Q2 and BD135 for Q3.
This circuit tests rectifier diodes with currents from 200 mA to 450 mA, thus serving to test...
This circuit generates a 1296 MHz signal from 100 or 1,000 kHz crystals. We found it in an...
This preamplifier with RIAA equalization was obtained in a documentation from the 1980s. The...