Frequency meter (CB7383E)

Found in a Popular Electronics from the 90s, this circuit reaches 100 kHz and battery power is recommended.

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Bipolar stepper motor control (CB8456E)
Found in a 90s Popular Electronics, this circuit uses common components. The power transistors can be...
LED driver (CB20550E)
Found in the documentation on PCs, this circuit excites LEDs whose current is determined by R3....
90 V regulator using PUT (CB8473E)
Found in a 1990s Motorola documentation, this high voltage circuit uses a PUT that is not a common...