SCR crowbar (CB8481E)

Found in a 90s American documentation, this circuit trips when there is an overvoltage at its output. The SCR can be any general purpose.

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Instrumentation Amplifier (CB18979E)
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Stepper Motor Control UCN5804 (CB15680E)
Using only a ULN5804 integrated circuit, stepper motors up to 500 mA can be controlled from TTL...
Constant Current Source (CB13073E)
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