Double limit detector (CB9589E)

Found in ancient American documentation, this circuit uses some components from the time, such as comparators.

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Capacitance multiplier (CB7803E)
We found this circuit in an old Popular Electronics. The circuit can be applied to other...
Wireless Batteries Charging Solutions
April 2017 - Mouser Electgronics offers a wide range of wireless charging solutions for IoT and...
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...