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Velleman K2579 Assembly Manual page 6

Universal start/stop timer

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Construction
1. Diode. Watch the polarity !
 D1 : 1N4148
CATHODE
2. Resistor
R...
 R1 : 1K
(1 - 0 - 2 - B)
 R2 : 10K (1 - 0 - 3 - B)
 R3 : 4K7 (4 - 7 - 2 - B)
 R4 : 1K
(1 - 0 - 2 - B)
 R5 : 10K (1 - 0 - 3 - B)
 R6 : 4K7 (4 - 7 - 2 - B)
 R7 : 1K
(1 - 0 - 2 - B)
6
3. IC socket. Check the
position of the notch!
D...
 IC : 8p.
4. Capacitor
 C1 : 100nF
5. Trim potentiometer
 RV1 : 2M2
6. Transistor
 T1 : BC547B
7. Electrolytic Capacitor.
Watch the polarity !

C2 : 100µF
C...
8. LED. Check the polarity!

LD1 : 5mm RED
C...
COLOR = 2...5
LD...
CATHODE

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