We find this oscillator in a 1980s documentation. The frequency depends on the crystal and the transistor used must be able to oscillate at the desired frequency.
Any general-purpose transistor can be used in this circuit that generates a rise ramp that can be...
Found in a 1965 Electronic Design, this circuit can be made with modern equivalent transistors. The...
The voltage comparator used in this application is the NCX2220 from NXP. What this circuit does is...