Super heterodyne input stage (CB8393E)

Found in a 90s Popular Electronics, this circuit uses components from that time, for a superheterodyne receiver design.

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Audio expander (CB8507E)
Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two...
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This power amplifier configuration can be used in a public address system (ads) in the car. The...