السلام عليكم
الدائرة دى ياحمام بتستخدم كدائرة تاخير زمنى للحماية عند قطع الكهرباء فهى تؤخر عمل الجهاز ثلاث دقائق مثلا
ودى مفيدة مثلا لعمل اجهزة التبريد مثل المكيف او الثلاجة لان انت عارف ان المكيف او الثلاجة اثناء عملهم بيكون ضغط غاز التبريد عالى ولو انقطعت الكهرباء وجاءت فى نفس الوقت بدون ماينزل ضغط الغاز ده بيعمل تحميل زائد على موتور المكيف ( الكمبروسور) وممكن يتحرق عشان كده بيستخدموا دوائر تاخير حتى ينزل ضغط الغاز عند انقطاع الكهرباء
Parts:
R1 = 1M
R2 = 470R
R3 = 820R
R4 = 56K
R5 = 470R
R6 = 1K
R7 = 10K
C1 = 1kuF-25V
C2 = 100nF-63V
C3 = 0.02uF-63V
C4 = 10uF-25V
C5 = 10uF-25V
D1 = 1N4007
D2 = 1N4007
D3 = 1N4007
D4 = 1N4148
D5 = Red LEDs
D6 = Red LEDs
RL1 = 12V Relay
IC1 = AN7809
IC2 = CD4060
SW1 = Switch
T1 = 24V-AC Centre Tapped Transformer
والدائرة دى بتاخر غلق اضاءة المصباح نصف ساعة
بس ملاحظ انه مبالغ فى مكوناتها حاسس انها كتير على الفاضى
خصوصا الاتنين ناند
انا هنزل الشرح بالانجليزى عشان مفيش عندك وورد اقراه واشرحها لو سمحت ياحمام
Parts:
R1 = 1K
R2 = 4K7
R3 = 10M
R4 = 1M
R5 = 10K
C1 = 470

F-25V
C2-C4100nF-63V
C1 = 470

F-25V
C2-C4 = 100nF-63V
D1-D4 = 1N4002
D5 = 5mm. Red LED
IC1 = CD4012
IC2 = CD4060
Q1 = BC328
Q2 = BC547
P1,P2 = SPST Pushbuttons
T1 = 9+9 Volt Secondary 1VA Mains transformer
RL1 = 10.5V 470 Ohm Relay with SPDT 2A 220V switch
PL1 = Male Mains plug
SK1 = Female Mains socket
Description
The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. It is useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep...
After turn-on by P1 pushbutton, the LED illuminates for around 25 minutes, but then it starts to blink for two minutes, stops blinking for two minutes and blinks for another two just before switching the lamp off, thus signaling that the on-time is ending. If the user want to prolong the reading, he/she can earn another half-hour of light by pushing on P1. Turning-off the lamp at user's ease is obtained by pushing on P2.
Circuit operation:
Q1 and Q2 form an ALL-ON ALL-OFF circuit that in the off state draws no significant current. P1 starts the circuit, the relay is turned on and the two ICs are powered.
The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin 12. IC2 starts oscillating at a frequency set by R4 and C4. With the values shown, pin 3 goes high after around 30 minutes, turning off the circuit via C3. During the c6 minutes preceding turn-off.
The LED does a blinking action by connections of IC1 to pins 1, 2 & 15 of IC2. Blinking frequency is provided by IC2 oscillator at pin 9. The two gates of IC1 are wired in parallel to source more current. If required, a piezo sounder can be connected to pins 1 & 14 of IC1. Obviously, timings can be varied changing C4 and/or R4 values.