PH meter (CB20731E)

This circuit was obtained in an old American documentation. The integrated circuit used is uncommon today. Modern equivalents can be searched.

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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...