Voltage Level Detector (CB22135E)

We found this circuit in an English documentation from the 80's. Transistors are general-purpose types.

Switch with automatic shutdown (CB21258E)
This circuit was found in Maxim documentation from the 1990s. The RC circuit determines the...
Wien bridge oscillator (CB21864E)
This Vienna bridge multi-band oscillator circuit was found in a 1974 Ferranti transistor manual. The...
100 LED Control (CB18972E)
This circuit can be used as a shield to control the matrix flow of 100 LEDs from a single output of...