Musical doorbell (CB9210E)

This musical doorbell was found in a Popular Electronics from the 90s. The U4 melody generator integrated circuit is uncommon today.

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10 kHz Low Pass Filter (CB14133E)
The circuit shown is suggested by National Semiconductor in its 1994 Linear Applications Handbook. We...
High Power Operational Drive THS3491 (CB19659E)
This high-power drive circuit for MOSFET excitation was obtained from the Texas Instruments...
Current limiter (CB12807E)
This circuit was obtained in a Texas Instruments 2012 documentation, which consists of a current...