6 V x 5 mA regulator (CB21537E)

This 6V regulator with FET was found in an old Electronic Design. FET and transistor admit modern equivalents.

Temperature Compensated Crystal Oscillator (CB5114E)
This circuit was found in an American 1980s documentation. Transistors can be commonly used for...
High Voltage Regulator (CB15737E)
This regulator provides a regulated output voltage of 48 V under a current of up to 1 A from a 60...
Multi-Pass Filter with Multiple Feedback MC1776 (CB4499E)
The integrated circuit used in this filter is not very common today, but the configuration can be implemented...