30W Amplifier (T489E)

This Public Address amplifier was found in an American publication from 1947. The circuit uses 5 tubes and a transformer source.

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Sequential Indicator (CB20342E)
This circuit was found in documentation from the 80s. The circuit did not include resistors from...
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This circuit used in instrumentation is suggested by National Semiconductor, now Texas Instruments and...
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The source shown in the figure provides output voltages in the range of 1.2 to 25 V with currents up...