Full wave rectifier (CB9455E)

This precision signal rectifier was found in an Electronic Design. The components used are from that time, uncommon nowadays.

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Telephone amplifier (CB9298E)
This circuit was obtained in a Popular Electronics of the 90s. The circuit uses integrated from...
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The configuration is from the 1994 Linear Applications Handbook by National Semiconductor. The...
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This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no...