In use telephone indicator (CB8665E)

This circuit was found in a 90s Electronics Now. The circuit can use a TIC106 for the SCR.

Line Receiver for Shared Line (CB13056E)
In the figure we show the typical configuration of a shared line using a twisted pair where the...
PLL Digital Metronome (CB18753E)
We found this digital CMOS circuit in a documentation from the 90s. The circuit generates signals...
Summing without adjustment (CB4907E)
This tuning-free circuit was found in an old operating amplifier manual. The setting can serve as...