Voltage Level Detector (CB22135E)

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

1-Transistor Amplifier Stage II (CB19570E)
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...
Electronic Christmas Tree (CB17040E)
This conventional LED effects circuit uses integrated CMOS. Today we can achieve the same effects...
1 A Flasher (CB13147E)
This circuit was found in an old American publication. It makes use of an integrated circuit...