r future kit telephone extension ringing ǧ¨Ã¾‡Ç§àÊ …€¦ · future kit future kit...
Post on 19-Oct-2020
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http://www.futurekit.com
FUTURE KIT
FUTURE KIT
HIGH QUALITY ELECTRONIC KITS
HIGH QUALITY ELECTRONIC KIT SET FOR HOBBY & EDUCATION
R ǧ¨Ã¾‡Ç§àÊÕ§¡ÃÔè§â·ÃÈѾ·‹
TELEPHONE EXTENSION RINGING
CODE 304 LEVEL 1
NO.2
Figure 2.Circuit Assembling
Figure 1. The Telephone Extension Ringing Circuit
NOTE:
FUTURE BOX FB03 is suitable for this kit.
TRIMMER
POTENTIOMETER
HORIZONTAL
VERTICAL
VR .....KΩ1
2
3
VR
VR
V
R V
R
Figure 3. Installing the componentsRESISTOR ELECTROLYTIC
CAPACITOR
Watch the polarity!C
+
+
C .....µFR
R .....Ω
R
C
+
C
C .....µF
C
CERAMICCAPACITOR
D
K A
D
K
A
DIODE
DK
A
TRANSISTOR
TR
NPN
B
E
C
TR
PNP
B
E
C
1
IC
IC
Watch the position
of the notch!
10K
+TELIN
+
TELEPHONEWALL
TELEPHONE
VR
+
+ +
+
+ FUTUREK
IT
SP
6-9V
+-
FK304
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