October 2010
Intermediate to advanced
320 pages
8h 34m
English
Content preview from Electronic Circuits for the Evil Genius 2/E
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SECTION 17Applying the Op Amp: Building the Intercom
HERE YOU’LL EXPLORE the individual portions of the intercom as you build the system. Consider radios. The system depends on amplifiers.
The microphone changes a voice into a small electric signal. This tiny signal from the microphone is amplified thousands of times before it is released as part of a modulated electromagnetic radio frequency.
A receiver is tuned to “resonate” to that frequency. Harmonics are a wonderful phenomenon. That weak harmonic signal is amplified in both voltage and current before it is directed to the speakers.
Lesson 57 Building a Power Amplifier Controlled by an Op Amp
So the Op Amp is now working as a preamp. The signal voltage has been increased, but there isn’t ...
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