Moderators note: removed excessive images]]>

because i have a planned circuit that has two buttons, 1 and 5.

when i hit the 1 button it would display 1 on the 7segment, then when i hit the 5 button it would add to 1 and would display the total of 6.

i tried using adders but whenever i hit the button it displays 5 or 1 then goes back to zero. so i'm thinking if it's possible with counters since the...

continuous adding using 74192?]]>

remove RL and determine Va-b. Each parallel branch should be 60v, using voltage divider for R2-3 I come up with Va-b=36v

Then I short circuit Vt and find the circuit equivalent resistance. With the...

Thevenin Equavalent Circuit]]>

I have following question:

1/4 of all the juniors and 2/3 of all the seniors are going on a trip. If there are 2/3 as many juniors as seniors, what

fraction of the students are not going on the trip?

Trip = 1/4Juniors(J) + 2/3Seniors(S)

I cant understand what is meant by "2/3 as many juniors as seniors". I think that J=2/3S.

Some body please guide me.

Zulfi.]]>

The line through the circuit separates the original configuration and the one I re-drew.

View attachment 137656

Thank you.]]>

I m kind of doing some 'exercises' about sampling (DSP, been a while.. ), & got stuck in this question ;

View attachment 137690

I think that after sampling, will be only 0.5 & 3 Khz frequencies left, and the other will be ' lost ' since it doesn't respect the sampling theorem.

is it 0.5 & 3 Khz ? or other ?

Many thanks !]]>

Analog to digital converter. 8 output bits. 256 or 255 divisions of input voltage?]]>

An investment is made at 12.5% annual simple interest. Find the number of years it will take for the cumulative value of the interest to equal the original investment?

Simple Interest formula is:

V=P(1+rt) Let p =10 & t=1

V= 10(1+12.5) = 135

In just one year the interest obtained is more than the Principal value. Some body please guide me what is my mistake. What I understand is that, I have to find the number of years in which the interest...

Simple Interest: Number of Years?]]>

as part of a semester long project I am designing a phase locked loop, which will then be simulated and constructed. I'm having difficulties with the frequency divider, as I don't seem to have enough background knowledge on the implementation of flip flops. I've understood and created the basic layout of a frequency divider (interconnected d flip flops) as shown below. However, ideally the frequency divider should be adjustable. I'm sure this could be achieved using a...

Frequency Divider for PLL using D-Type Flip-Flops]]>

The first I did was to find the transfer function with the impedance divider in the 's' domain:...Cutoff frequency of LC filter]]>

]]>

The question is:

Amy deposited $1000 into an account that earns 8% annual interest compounded every 6 months. Bod deposited $1000 into an account that earns 8% annual interest compounded quarterly. If neither Amy nor Bob makes any additional deposits or withdrawals in 6 months, how much more money will Bob have in his account than Amy?

For Amy:

P=1000, t=1, n=2, r=4%...

How to calculate Compound interest?]]>

Can you help me calculate this transfer function?

Cordially.]]>

i need a constant current on load resistance or leds more precisely and found this circuit through my friend but i am in bit confusion like i know when BJT turn on and Ic current starts flowing please hep me to understand this.]]>

this is what we made in the lab

View attachment 137273

*...

The waveform after replacing 2 diodes with 2 resistor in bridge rectifier]]>

R1= 20

R2=?

Rt= 13.33

Any help would be great]]>

As you can see the base of Q2 and Q4 is at ground and the emiters looks to be at higher voltage than base, so it looks like Q2 and Q4 are always in active region, supposing that the current gain is much greater than 1, then base current of Q2 and Q4 is ~0A and (Ic2=Ie2, Ic4=Ie4), so basically Q2 and Q4 are like current sources....

Astable multivibrator using BJT transistors]]>