Bipolar stepper motor control (CB8456E)

Found in a 90s Popular Electronics, this circuit uses common components. The power transistors can be current equivalents of the TIP or BD series.

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EMI Multiple Filter (CB17630E)
This efficient filter against EMI has several coils, being L1 and L2 formed by 100 turns of wire...
Robot Eyes (CB24942E)
This optical sensor circuit for a robot was found in the March 1986 issue of Radio Electronics magazine....
Positive and Negative Voltage Source (CB19212E)
This circuit can provide both positive and negative voltage outputs from 2 to 12 V with current up to...