Sinusoidal peak detector (CB21519E)

This circuit for a frequency of 10 kHz was found in an Electronic Design. It makes use of a tunnel diode. The transistor admits equivalent.

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Limiter Amplifier (CB12468E)
This amplifier for effects on musical instruments can be mounted with BC549 transistors. The...
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We found this circuit in documentation from National Semiconductor. For the medium wave range the...
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According to what is said, the bugs are the female insects (mosquitoes, muriçocas and others)....