This circuit was taken from the 1976 Siemens Integrated Circuits Manual. The TCA106 is an operational amplifier similar to the 741.
This power supply with transistor regulation was obtained in a 1995 documentation. The power...
This two-station intercom was found in documentation from 1966. R4 should be experimentally...
We found this circuit in a publication from 1966. The components are from the period. Complete...