This circuit is from documentation from 1965 but can be easily implemented today using modern transistors. We can use BD136 for Q1 and TIP42 for Q2. The TIP must be equipped with a heat sink.
This TTL dice is from an old publication from 1978, but it can still be assembled, as the...
This precision signal rectifier was found in an Electronic Design. The components used are from...
We found this setting in the National Semiconductor Linear Applications Handbook. The base is an...