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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Instrumentation Amplifier (CB20984E)
Found in National Semiconductor publication from the 1980s. This gain-100 circuit can be...
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This circuit for the radio amateur also includes the beep effect when changing. The circuit is...
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This configuration can be implemented with equivalent operations. The circuit is from the 1990...