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thanks all helped

how the dot of D1 light up every 32 pulses counted by IC2?whats the rule of Q2?

thank you for answers would you tell me about question 3 3.if Q2 be in cutoff ,how is the function of D1? and other question i think a little about question and searching would you check my answer correct or complete them? 1.the function of D1 with considering D2 function? Decade counter with decoded 7-segment display outputs drive D1 and after 9 digit pin"5" give out 1 and D2 show 1 Km 2.why pin"14" of IC2 is grounded by C4?C4 provide needed voltage for IC 3.if Q2 be in cutoff ,how is the function of D1?i do not know 4.function of Q1 in circuit?driving pizo sounder 5.how dose D2 count(show) 50 & 100 meters (full function description )?i just know 100m but not 50 m 6.IC1D with which logic state enable the circuit?it enable by low to high transition

Hi friend i have questions about below circuit & really need their answer soon R2________2M2 1/4W ResistorR4________1M 1/4W ResistorR5,R7,R8__4K7 1/4W ResistorR6_______47R 1/4W ResistorR9________1K 1/4W ResistorC1_______47nF 63V Polyester CapacitorC2______100nF 63V Polyester CapacitorC3_______10nF 63V Polyester CapacitorC4_______10΅F 25V Electrolytic CapacitorD1_______Common-cathode 7-segment LED mini-display (Hundreds meters)D2_______Common-cathode 7-segment LED mini-display (Kilometers)IC1______4093 Quad 2 input Schmitt NAND Gate ICIC2______4024 7 stage ripple counter ICIC3,IC4__4026 Decade counter with decoded 7-segment display outputs ICQ1,Q2___BC327 45V 800mA PNP TransistorsP1_______SPST Pushbutton (Reset)P2_______SPST Pushbutton (Display)SW1______SPST Mercury Switch, called also Tilt SwitchSW2______SPST Slider Switch (Sound on-off)SW3______SPST Slider Switch (Power on-off)BZ_______Piezo sounder] R1,R3____22K 1/4W Resistor Questions 1.the function of D1 with considering D2 function 2.why pin"14" of IC2 is grounded by C4? 3.if Q2 be in cutoff ,how is the function of D1? 4.function of Q1 in circuit 5.how dose D2 count(show) 50 & 100 meters (full function description ) 6.IC1D with which logic state enable the circuit? if its possible please describe the circuit and its elements briefly Device purpose: This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants' pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) shows hundreds meters and its dot lights after every 50 meters of walking. A beeper (excludable), signals each count unit, which occurs every two steps. A normal step is calculated to span approx. 78 centimeters, thus the LED signaling 50 meters lights after 64 steps or 32 mercury switch's operations, the display indicates 100 meters after 128 steps and so on. For low battery consumption the display lights only on request, pushing P2. Accidental reset of the counters is avoided because to reset the circuit both pushbuttons must be operated together. Obviously this is not a precision meter, but its approximation's degree was found good for this kind of device. In any case, the most critical thing to do is placement and sloping degree of the mercury switch inside the box. Circuit operation: IC1A & IC1B form a monostable multivibrator providing some degree of freedom from excessive bouncing of the mercury switch. Therefore a clean square pulse enters IC2 that divide by 64. Q2 lights the dot of D1 every 32 pulses counted by IC2. IC3 & IC4 divide by 10 each and drive the displays. P1 resets the counters and P2 enables the displays. IC1C generates an audio frequency square wave that is enabled for a short time at each monostable count. Q1 drives the piezo sounder and SW2 let you disable the beep. thanks