DC static switch (CB9257E)

This circuit was found in Motorola documentation from 1968. SCRs can be modern equivalents and the maximum load is 5 A at 40 V.

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Automotive Tachometer (CB13706E)
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Transistor gain test (CB20734E)
With this circuit it is possible to select transistors and their compliant test. Or circuit...
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This power supply circuit with selectable voltages was found in the June 1979 issue of Radio...