15W Amplifier (CB6284E)

This circuit was suggested by Texas Instruments in a 1968 publication. The transistors are of the time, and modern equivalents can be used.

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Single Pump Control (CB6272E)
Using only one integrated circuit this control was found in an 80's Electronic Engineering. The circuit...
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We found this circuit in a 1975 radio amateur documentation. The circuit uses TTL technology and...
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The transistors of this circuit found in an English 1980s documentation may be the modern BC548...