Im now trying to get help or a push in the right direction to let me solved this, there is probably something i have missed but i cant seem to figure it out.

I need to decide the gain of V(out)/V(g).

From the text (Swedish) i got:

hfe=B(ac)=300

(Ohm)

Rg=5k

RL=5k

Rc=2.7k

R1=68k

R2=15k

Re=100

RE=470

Vcc=10V

* i did take 1/hoe out of account because i cant solve for it and its most likely to big to...

Need help with gain of a BJT amplifier, circuit.]]>

p.s. have been stucked here since 3 hours ago...i wonder is it because of my fever that might have caused me to not spot the mistake......

60 MOD Stopwatch- having problems in recycling]]>

4 bit 2s Complement Adder Circuit]]>

Upon my first attempt i thought this wasn't too hard and i got an answer. Unfortunately it turns out that i used Ohms law instead of Kirchoff's laws.

I've been trying to solve this for a long time now, but i just can't do it as it doesn't have any information about the current or total resistance.

I think that voltage could be the same across each component of the parallel circuit. So the voltage across the 5 ohms resistor could be 75 Volts

Your help is greatly appreciated, thank...

Calculate resistance using Kirchoff's laws]]>

Moderators note : moved to Homework help]]>

I have a homework. My homework is that my school code (180757095) will be written on a 7-segment, however, there are four conditions for doing this:

1-) In turn (1>8>0>7>5>7>0>9>5)

2-) Periodically (For Example: Between 1 and 8--> 2 seconds)

3-) The counter have to back to square one.

4-) The followings have to be used in this project:

There is a problem when creating the truth table. How can I put repeating numbers to the current positions or next positions in the J-K...

I can't create truth table, because the project consist of arbitrary sequence and repeating number.]]>

I searched for some schemes on the internet, but I simulated them in Orcad but it does not work.

Can you help me?]]>

Struggling with a design question and how to get started with it.

A strain gauge sensor, R4, has a resistance value from 110 ohms (no deflection) to 110.7 (full deflection). I need to design a circuit that will use this sensor to produce a voltage in the range [0.0V, 3.0V].

I need to calculate the value of Vsensor in the circuit.

Let R = R1 = R2 = R3, prove that Vsensor = Vs x (R-R4)/2R.

View attachment 163909

I am struggling to see what voltage I would give Vs.

Any help...

Desiging a circuit for a strain gauge.]]>

After doing alot of research I came across this Constant Q topology on sound whistles based off of the research paper(linked below). It posed some really nice advantages and simplicity compared to other topologies using the MFB band-pass filter.

I proceeded to derive the TF for the MFB band-pass filter (Didn't upload it as it's in a...

Help with Constant Q Graphical Equalizer Design]]>

The prob is stick to 1mH Inductor.

Now, I found that the current flowing in inductor makes a low pass filter.

However I cannot show how does the inductor makes a low-pass filtering.

All I know is that an inductor is familiar with low frequency and a conductor is familiar with high frequency. That's all I got.

Can anybody add some information for me? Thank you.]]>

Hi, I was given a question to express Vload in terms of Rload, R and Vth. However, I am a bit confused as to what exactly is going on at Vout_a.

Assuming the op-amp is ideal, I first made statements regarding what voltages were equivalent.

Vload = Vout

Vout = Vn (negative terminal of op amp)

Vn = Vp (positive terminal of op amp)

Vp = Vout_a

The problem that I run into is figuring out what Vout_a is. I tried doing KCL at that node, but all i get is that Vout_a...

What is happening in this circuit?]]>

I want to design a system to measure mass air flow and to determine the air flow direction inside the duct.

could anyone give me any idea on how to build such system ?

Regards]]>

I have this university project, where I need to build a binary adder which basically adds two 3-bit numbers, now I know the approach is to use half-adders and full-adders but I need to build these from their corresponding components.

when studying the way gates are designed, in order to take more than one input we use a multi-emitter transistor which makes sense. However, I can't seem to find a multi-emitter transistor to use in order to build my...

TTL NAND gate (multi-emitter transistor)?]]>

I am asked to calculate the magnitude of the current across C1. I am suggested to find the total impedance in the circuit and then find the current across C1. I know that the answer should be 31.4A. I don't really know how I should approach this problem. I do not understand if C4 and C2 are in series or parallel. To me it looks like C2 and C4 are in series and in parallel to C1 and C3. I have tried it like...

Finding the magnitude of the current across a capacitor]]>

Trying to make a 4 bit adder, but as soon as I tested a simple chip with AND gates (tested 3 in case 1st was faulty) it doesn't seem to make sense.

Dip switches: A : ON B :OFF (A and B should be OFF) and LED is ON.

LED is only off if both A+B are off

(photo for reference in case I messed up connecting anything)

Many thanks in advance

Miguel

CHIP CD4081BE

PS - on that first XOR gates chip I don't even...

4 Bit Adder build - chip outputs make no sense]]>

Can some body please guide me what is the reason for this?

Zulfi. View attachment 165385