Here’s another two-power source microphone
amplifier, but this one is an inverting amplifier. We
use the earphone as a microphone again.
Slide the switch to position B and assemble the
circuit. When you finish the wiring, slide the switch to
position A to turn the power on, rotate the control
clockwise, and speak into the microphone – the
earphone. You will find that the project works just like
our last project.
IC 1 used as a buffer of gain 1, and IC 2 as an
inverting amplifier. Input reaches this inverting
amplifier through its negative (–) terminal, not the
positive (+) one as in our last project. Its gain is
about 100, as determined by: R1/R2 = 100k/1k.
The gain becomes larger if you increase R1 or
decrease R2. See what happens to the gain when
you change the value of R2 to 470.
Notes:
EXPERIMENT #76: INVERTING TWO-POWER SUPPLY AMPLIFIER
-95-
Wiring Sequence:
o
1-29
o
2-30
o
3-64-90
o
27-69
o
63-131
o
65-89-76
o
68-67-75
o
70-134
o
121-135
o
122-132
o
124-119-26-66-5-14-EARPHONE
o
28-13-EARPHONE
Schematic
Содержание EP-130
Страница 11: ... 11 I ENTERTAINMENT CIRCUITS ...
Страница 26: ... 26 II BASIC SEMICONDUCTOR AND COMPONENTS CIRCUITS ...
Страница 36: ... 36 III LED DIGITAL DISPLAY CIRCUITS ...
Страница 41: ... 41 IV A TOUR THROUGH DIGITAL CIRCUITS ...
Страница 49: ... 49 V MORE ADVENTURES WITH DIGITAL CIRCUITS ...
Страница 64: ... 64 VI THE WORLD OF TRANSISTOR TRANSISTOR LOGIC ...
Страница 77: ... 77 VII APPLICATION CIRCUITS BASED ON THE OSCILLATOR ...
Страница 88: ... 88 VIII BASIC OPERATIONAL AMPLIFIER CIRCUITS ...
Страница 116: ... 116 IX MORE ADVENTURES WITH OPERATIONAL AMPLIFIERS ...
Страница 129: ... 129 X COMMUNICATION CIRCUITS ...
Страница 136: ... 136 XI TESTING AND MEASURING CIRCUITS ...