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-2
votes
0answers
28 views

Photodetection related circuits [on hold]

our professor said that for driving a photodetector, we need some related circuit such as filters, lockin amplifier, preamplifier,readout ,... does anybody know that what is readout circuit and it's ...
0
votes
2answers
117 views

Finding the voltage and charge across capacitor

Can someone help me find the voltage and charge across each of the capacitors? This is not just a simple/ parallel circuit so I am having a problem in formulating the right equation on how to find the ...
1
vote
3answers
261 views

what is this current source

When we connect a resistor to current source a finite amount of current flows through it right? Okay but how is a closed path complete?I mean the current source has infinite resistance(I'm talking ...
-8
votes
0answers
49 views

Solve Questions on full electrical syllabus and help me out its life [on hold]

Please solve these questions and give complete answers. Thank You
0
votes
2answers
70 views

need help analysing this BJT circuit

I need help analysing this BJT circuit. What I need to find is the equation for IB, IC, and VCE for this circuit. So far what I've got is from KCL : a: I1=Ib+Ic b: Ie=Ib+Ic So I find that I1=Ie, and ...
0
votes
0answers
21 views

Hybrid design that includes satellite phone on to a laptop PCB [on hold]

My name is Brzenski and I am an student at college in London, doing Network Engineering and Telecommunications. I am in my final term for an HND and have to do a project. I came up with an idea to ...
2
votes
2answers
86 views

Activate a buzzer when power goes off

I am totally new to electronics so I would like to have your help. The project I would like to build is very simple but yet I don't know the name of the parts that I have to use. So, I would like to ...
0
votes
1answer
50 views

filter whose gain increases from minimum to maximum for frequency 400Hz to 1kHz

I want to design high pass filter whose gain should increase from minimum to maximum ( minimum upto 400 Hz maximum for 1 kHz) linearly or exponentially. It must be an active filter and my input signal ...
1
vote
1answer
49 views

Panic button alarm system circuit [on hold]

I'm a homeschool mom with absolutely minimal knowledge of electronics. How should the following panic button alarm system circuit look? Four cells connected parallel or series, two panic buttons ...
1
vote
1answer
28 views

Norton's Circuit of dependent source

I want to know whether the two circuit given are equivalent? Explicitly I want to know when can we use Norton's transform for dependent source? simulate this circuit – Schematic created ...
0
votes
1answer
61 views

how to use lm317t?

I have a robot on wheels that uses 7.2v battery. The battery runs it for good amount of time it is a 2000mah nimh vex battery. I want to supplment and charge it during peak hours. I bought 4 solar ...
0
votes
0answers
59 views

Circuit diagram drawing [on hold]

I am working on an assignment and am having trouble accomplishing the given task. I'm asked to use an online circuit simulator to draw some circuits (specifically those circuits using NOR gates, EOR ...
1
vote
1answer
45 views

voltage Gain in BJT

I am reading the book: Problems & Solution of Electronic Devices & Circuits, and on page 119 I got stumped. They write that : $$A_V = A_I \cdot \frac{Z_L}{Z_i}= \cdots = ...
2
votes
2answers
137 views
+50

Does this simple RF transmitter circuit actually work?

I've come across this circuit a few times while searching for simple transmitter circuits, and decided to try it. According to this site, it should be transmitting at around 90Mhz. ...
0
votes
2answers
55 views

What is the purpose of using only the coil of a relay?

In these two examples: http://www.electronicecircuits.com/electronic-circuits/cd4060-timer-circuit-1-minute-to-2-hours/comment-page-4#comment-48679 http://www.zen22142.zen.co.uk/ronj/24hs.html A relay ...
0
votes
1answer
91 views

Can a simple voltage divider circuit be used to accurately measure voltage?

I have a discharger circuit that I intend to hook up to a 3V battery. Total resistance of the circuit (depending on how fast I intend to discharge it) will vary from 0.04 to 0.01 Ohms (that's 75A and ...
-2
votes
0answers
48 views

Jk- Flip Flops design [closed]

I am having problems with getting my jk- flip flops when design to count i got a scenario to design there generators that trrigers one after the other generator A triggers B and B triggers c gen A ...
1
vote
1answer
52 views

What is the purpose/benefit of using different electrodes in the same circuit?

I've studied various science fields in depth for years it seems, and I have never been able to get an understanding of this fundamental idea. I understand the purpose of different types of electrodes ...
-2
votes
0answers
44 views

What are some best Stereo FM trasmitter circuits [closed]

I want to transmit music in approx 50 - 100 m area ( within apartment). No more range needed. I'm new in electronics project. What are some best Stereo FM transmitter circuits in terms of high ...
1
vote
1answer
45 views

Share circuits between different simulators

How do we share circuits between different simulators ? Say, we have 3 simulation tools ; Proteus, multisim, and LTSpice ( or anything else). How do we share the circuits made in one of the ...
0
votes
0answers
31 views

Kmap Implementation in Electronics Workbench

I'm working in Electronics Workbench and after simplifying two of the Kmaps, I got values : Jd=1 & Kd=1 How would I implement that in the circuit? I know it looks confusing at the moment.
0
votes
2answers
90 views

Looking for a huge circuit compilation [closed]

I have noticed that during my circuit design i always end up finding around the net better ways to improve my designs pic related its an example, Its a fuse blown indicator that gets improved by ...
0
votes
0answers
69 views

How to cascade transformers?

I'm currently working on a project were I need to cascade several transformers (the core we use does not nearly work as good as it ought to..). I'm using the equivalent circuit shown in (A), ...
0
votes
3answers
74 views

Transfer function of amplifier

Hello everyone, I would like to find transfer function between input signal \$U_1\$ and output signal \$U_2\$. So, I know how to find the transfer function of each op-amp, for example, 1 transfer ...
0
votes
1answer
28 views

IF signal amplify without delay

I have a RF Frontend that has an 4 IF signal output (2 I channel and 2 Q channel from 2 receiving anettans). Each channel of the IF has a signal rangining from 1.5V to 3.5V with a DC offset of 2.5V. ...
7
votes
7answers
2k views

Transistor - Why does amplification happen before the transistor and not after?

I know this is a noob question but I just can't find an answer for it on google search results. Well my question is basically this: How come the amplifying occurs before the transistor [red line] ...
2
votes
1answer
92 views

Simplifying CMOS schematic to reduce number of transistors

I know the basics in creating a schematic in CMOS, wherein in a(n inverted) boolean expression, if there is a: NOR - NMOS should be in parallel, PMOS in series; NAND - NMOS in series, PMOS in ...
0
votes
1answer
68 views

How to Modulate Current without an Arduino

I am looking to turn current "on" and "off" extremely fast without the use of an Arduino. With an Arduino, I understand I would be able to do that in code. However is there another way of doing this? ...
0
votes
0answers
27 views

Can I power a IOIO-OTG board with the regulator on a Koala Protoboard?

I'm building a small device which uses a IOIO-OTG board. I figured I would mount my components on a Koala Protoboard along with the IOIO to use the recharging/usb regulator circuit provided on the ...
0
votes
2answers
69 views

Why is my circuit not providing the right voltage to my motor?

I have a circuit which is supposed to vibrate a vibrating motor. The circuit is fairly simple and uses a BJT to step up the current to the motor. The motor also has a capacitor and diode in parallel ...
0
votes
1answer
58 views

Draw circuit of a transfer function

I have the following transfer function: $$\frac{4}{s(s+0.5)}$$ How do I draw a circuit out of this function? I don't have electronics skill so if anyone could help me draw this circuit I would ...
1
vote
0answers
103 views

How does this circuit with three transistors work?

I don't understand how this circuit works. Its a clap switch circuit with transistors. I would appreciate if someone could explain how the current flows through the circuit and which transistor ...
0
votes
3answers
60 views

Different time constants for charging and discharging of modified RC circuit

I recently performed a test in an electrical measurements lab which left me confused. I measured the response of the following circuit: And obtained the following output: According to my ...
0
votes
1answer
36 views

Television Radio Module or Circuit

I want to listen TV channels without display (terrestrial) just like FM Radio channels. There are lots of FM receiver circuits on the web but I couldn't find for TV channels. Is such a thing possbile ...
1
vote
0answers
42 views

In the under-damped RLC Circuit, one constant is imaginary, but there can't be imaginary current

I'm just learning about RLC circuits and all the math makes sense, but one thing has been bothering me. In the derivation of the equation for a underdamped, series RLC, the roots to the ...
7
votes
3answers
150 views

High Voltage PCB Design

I want to design a 4 layer PCB with the following voltage levels. GND, 5V, 3.3V and 80V. In the circuit there are some MOSFETs which are driven by 3.3V and MOSFET switch 80V (required current is very ...
2
votes
3answers
89 views

Electrical switch/relay that will stay on once triggered (regardless of future inputs)

I am looking for an electrical device that will allow for me to take an input (that will change from high to low to high again) and have it trigger an output (turn high when my input is low) but stay ...
0
votes
0answers
57 views

Bi-color LED for low and high-inpedence switching

I designed a circuit to make glow a green LED when a input pin is in high impedance state. When the input pin is connected to ground, Red LED must glow. I've been searching for a bi-color LED for this ...
0
votes
5answers
97 views

Circuit Simplification

Calculate the current shown by the ammeter. simulate this circuit – Schematic created using CircuitLab How do we solve this using delta-wye transformations?
1
vote
1answer
49 views

Improving my impulse counter circuit

I just started studying electrical engineering this semester, and I'm currently working on following impulse counter: The circuit is basically a power supply regulated to 5V, a pendulum acting as ...
0
votes
1answer
31 views

Modelling priority/importance in a digital circuit

I'm attempting to create a digital circuit that has three inputs representing binary numbers. For example 001 would equal 1 in decimal , 011 would equal 3 and 111 would equal 7. So overall the highest ...
0
votes
1answer
42 views

Designing a 2 bit magnitude comparator [duplicate]

As a foreword I would like to say that I am asking this question as part of a computer science course assignment, and any responses here might be referenced in my report. I am ideally looking for ...
1
vote
1answer
70 views

Determining Vo in a circuit with diodes

This is the question: And this is my solution: (a) (b) When vI > 2.7, D1 is on and D2 is off. The circuit will look like: ...
0
votes
1answer
58 views

How to make a digital comparator with multiple inputs?

I have been attempting to make a digital comparator but I am struggling to get in more than one input. The idea is that I have 2 sets of 2 numbers (4 inputs total) and I want to have the output take ...
1
vote
2answers
69 views

How do we predict if power loss will increase or decrease in a DC circuit?

I want to know whether it is possible to predict if power loss will increase or decrease in a circuit with a fixed EMF, a fixed resistor in series and a variable resistor in series. If we change the ...
-2
votes
1answer
54 views

Current overlap in Inductive Smoothing?

I have the following circuit implemented in the lab : And the output was : Can anyone explain why the current overlaps here ? I can't make sense of this.
0
votes
1answer
66 views

How to solve this circuit using mesh analysis? [closed]

simulate this circuit – Schematic created using CircuitLab How would I solve ...
0
votes
0answers
29 views

Help with harder version of carry chain adder?

I am designing an addr circuit given cin = 0, given a nand of the operands i want to add, their xor, and nor. I have drawn it in a software but i am not getting the right output, i have tried to ...
1
vote
2answers
93 views

Circuit seems to lack something

http://www.electronicecircuits.com/electronic-circuits/cd4060-timer-circuit-1-minute-to-2-hours I've replicated the circuit in the given link but \$D_2\$ in my circuit doesn't work at all. Also, the ...
-2
votes
1answer
31 views

Finding Vo with superposition method

simulate this circuit – Schematic created using CircuitLab