Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

Vehicle alarm (CB20627E)
This car alarm was obtained in a Signetics documentation from the 1980s. The circuit uses the 555...
Battery Monitor (CB4371E)
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
12 + 12 W amplifier TDA1521 (CB15986E)
This integrated is indicated for sound systems of stereo televisions and stereo radios. Its pinout...