Recent content by thuc

Ok, this is part a)

I have problems with question b. I don't know where to start. If the switch is on steady state, the current through capacitor would be 0 and i can't have K. This makes me confused. This is the Total response function of a): V0(t) = K^(-1/2t)

So when i use the bread board to test my circuit, i realize that the 7 led segment didn't have the power although i followed my design in proteus carefully. So i have another question: Is the design in Proteus reliable ??

Well, i tend to use the resistors to reduce the 6V source ( a 4xBatteries holder, 1.5V each battery). Should i use three resistors for pin 4 and pin 10 for 7474s (As from the dataheet it's 5.5V max) or should i add a resistor to the possitive wire of the battery ?

well, i tend to use two 10k resistors to reduce the 6V source ( I have a 4x battery holder )

Oh i forgot to mention: it's a counter down circuit, i want it to count from 7 to 0 repeatedly. I saw a guy on youtube had the pin 2 of 7474 connect to ground, can you tell me why ?

thanks for showing me guys, but i still don't understand why it doesn't work, i have checked it many times. Mine counter up consits of 1xNE555, 2x74LS74, 1x74LS47, 1x7segment LED 5101BS. and a source with 4 batteries.

I have drawn my circuit in Proteus, and in the simulation it can run, but when i used GL 12 test board to test my circuit, it can't run. And i reallize that i don't know where is the ground in the test board. Can you guy tell me where is the ground ?

Thanks alot, buddy.

Hi guys, I'm new to this language. When studying I'm really confused and don't know where to start, even with a simple example. I have read the book Introduction to Computing System but it doesn't help much. Can you show me some ways or books that can help me ?

oh thanks, but I have another question: when i have 2 power sources which power source will generate the current ? for example in this exercie

Hi guys, I'm having some troubles while doing KCL and KVL exercies. I have two question: 1. Do I have to define the polarities of resistors and how to do that ? 2. When do i need to use the STANDARD LABELING ? For example in this exercie