-19-
Here’s another siren - don’t be surprised if this
becomes the most popular circuit in this entire kit.
This circuit sounds even more like a real siren on a
police car! After completing the wiring, press the
key. You’ll hear a tone gradually getting higher.
Release the key, and the tone becomes lower and
then fades out.
Here are some of the modifications you might want
to try:
1. Change the 10
μ
F capacitor to a 100
μ
F or 470
μ
F.
This gives a very long delay for both turn on and
turn off.
2. Change the circuit to eliminate the delays by
temporarily disconnecting the 10
μ
F capacitor.
Simply disconnect one of the wires from terminal
113 or terminal 114. (Sounds dead in
comparison doesn’t it!)
3. Change the 0.02
μ
F capacitor to a 0.01
μ
F and
then to a 0.05
μ
F.
Notes:
EXPERIMENT #8: ELECTRONIC SIREN
Wiring Sequence:
o
1-29
o
2-30
o
3-103-109
o
4-119-137
o
5-47-110
o
46-104-90
o
114-48-120
o
85-138
o
86-89-113
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 ...