Optical fiber receiver (CB9736E)

This high sensitivity receiver of 30 nW was found in documentation from the 1980s. Integrated circuits are from that time.

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Field intensity meter (CB7563E)
Found in a magazine 73 for radio amateurs, in a 90's edition, this circuit uses a general-purpose FET...
Mini Power Supply (CB1411E )
This small power supply for low currents (5mA) is suitable for power low-power TTL experimental circuits....
Voltage Regulator for 12 V and 100 mA (CB788E)
This simple voltage regulator or stabilizer uses only two component and can source up to 100 mA to a...