This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
May 2016 - Mouser Electronics is sourcing the new high-performance audio amplifiers with bipolar...
This circuit has been found in older telecommunications documentation. The circuit switches off after...
This TTL dice was found in an old American 1980s documentation, but can still be easily assembled....