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ADJUSTABLE TIMER WITH ACCOUNT A REBOURS DIGITAL

ADJUSTABLE TIMER WITH ACCOUNT A REBOURS DIGITAL

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  IDEA ELECTRONIC PROJECT

ADJUSTABLE TIMER WITH ACCOUNT A REBOURS DIGITAL
It is possible to set times between 1 second and 10 minutes. The power supply must be 12 VDC stabilized and is indicated by a dot on the display. By pressing the appropriate button, the relay becomes excited and de-energizes only when the imposed time has elapsed.

Throughout the timeout period, the display shows the number of hundredths of the set time remaining before the end of the timer. The display will show 00 (100), 99, 98, 97 and so on until 0 (reset time). The device can be reset at any time by pressing the RESET button. The contacts of the relay act as selectors and they can withstand a maximum current of 1 ampere. The maximum power consumption of the device is 200 mA.

NOMENCLATURE:

R1 = 1 KR
R2 = 1 KR
R3 = 1 KR
R4 = l KR
R5 = 1 KR
R6 = 1 KR
R7 = 1 KR
R8 = 1 KR
R9 = 1 KR
R10 = 1 KR
R11= 1 KR
R12 = 1 KR
R13 = l KR
R14 = l KR
R15 = l KR
R16 = l KR
R17= 10 KR
R18 = 10 KR
R19 = 3,3 KR
P = 1 MR
Cl = 100 MF 25 Volts
C2 = lMF 25 Volts
C3 = 100 nF céramique
C4 = 100 nF céramique
C5 = 47 nF céramique
D1 = 1N4148
DL=Display 2 Digits
T1 = BC304
IC1 = 555
IC2 = 40110B
IC3 = 40110B
IC4 = 4013B
RL = Relais 12 Volts
MP1 = Micro poussoir
MP2 = Micro poussoir
1 Support 8 broches
1 Support 14 broches
2 Support 16 broches

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