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.

| Clique na imagem para ampliar |

Battery Rejuvenator (CB16504E)
Ordinary batteries cannot be recharged, but they can go through a process of "rejuvenation" that...
Unijunction Pulse and Signal Generator (CB13329E)
We found this basic circuit of a relaxation oscillator with unijunction transistor in a 1976...
Water Pump Automatic Control (CB18033E)
This circuit, from a 2006 documentation, automatically controls the activation of a water pump, and...