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0
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1answer
11 views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
1
vote
2answers
105 views

Bike light blink speed adjustment

I am trying to construct a circuit to control an LED in a bike light kind of circuit. This circuit must be designed so that a button press can change the current setting of the light. So for instance ...
-2
votes
0answers
32 views

Ring system of wiring [on hold]

very appliance is connected in parallel in this type of wiring right? Ring system of wiring for Household Circuit can you please explain how is the arrangement done? if possible please send me a ...
0
votes
1answer
56 views

Buffer Capacitors [duplicate]

What does a buffer do? In the given circuit,it is said that capacitors C1 and C4 act as buffer .What is their role here?Can't we just replace them with pull-down resisrors?
2
votes
0answers
49 views

What could this PLA be doing?

The picture below shows a PLA, I have done part (a) and found out that; F0 = A0 xor B0 F1 = A0B0 + (A0' + B0')(A1 xor B1) F2 = A0B0(A1 + B1) + A1B1 What may this circuit be doing, I can't see a ...
0
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0answers
39 views

How does this 2 LED flasher circuit work? [duplicate]

I understand the capacitors hold the transistor open or close, but I don't really understand how it "toggles" to flash the LEDs.
0
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2answers
49 views

What is the error in my analysis?

So, I am to analyze this circuit. So, this seems easy enough: Node 3: \$v_3=20 \space \mathrm{v}\$ Node 2: ...
1
vote
1answer
57 views

Microcontroller circuit

I am using a Stellaris EK-LM4F120XL for a project. The project includes an LCD module, servo motor, ultrasonic ranger and a numpad. The LCD, servo and ranger are rated at 5V operating voltage, and the ...
0
votes
2answers
39 views

Low voltage cut out switching for a 6v input SLA to 5v output circuitry - or alternative ideas

I am currently modifying a wireless video door phone system with remote door release system, for use with a walking frame, for my elderly mother in-law, who lives alone. The 7"monitor runs a 5v 1a DC ...
0
votes
0answers
15 views

Can't find TEC between nodes 'a' and 'b' correctly

I'm currently learning Thevenin's Theorem and it seems that I can't solve the easiest problem in this chapter. How I tried to solve: (a) The node a being positive and node b negative, doing ...
1
vote
6answers
417 views

Need to build a circuit resembling fluid flow through porous media

I am trying to use electronics analogy to build a model that describes fluid flow in a porous media. For example I consider voltage, current and resistance to be equivalents of pressure, flow rate and ...
0
votes
2answers
33 views

Relay circuit for AC application

I am using relay circuit for inverter application. It's 12V relay having coil and two contacts for connecting line and neutral respectively. But, I am not getting closed connection when I am giving ...
1
vote
1answer
44 views

Analog PWM generator from 0%

I have to prepare easy analog PWM regulator which can operate from 0% (0V). I know that one 555 can't do that... Do you know any circuit that can handle that?
0
votes
3answers
75 views

How do I build a one shot non-retriggerable pulse generation circuit with 2 triggers?

I'm kind of a noob when it comes to electronics (I'm mainly a computer programmer), so please bear with me. I want to construct a one shot non-retriggerable pulse generation circuit that has two ...
0
votes
0answers
21 views

How can I stacke 4 controllers to get higher voltage? [duplicate]

I deal with solar charge controllers. Often I have a problem with not having controllers rated high enough voltage-wise. I know that charge controllers can be stacked. But can they all be stacked? ...
2
votes
1answer
40 views

Automatic cut off after switch is pressed

I have a fun one for you. Here is my diagram: It's a 555 timer in a monostable one shot configuration. What I want to do is find a way to prevent the LED from staying on if the switch is held down. ...
5
votes
1answer
266 views

Zener diode circuit

When I tried to find current flowing through 1.2k ohm resistor, I am finding 8.33 mA but there comes the problem: I am finding the current through the 1k ohm resistor is 6 mA. What am I doing wrong? ...
1
vote
1answer
175 views

Are these H-Bridge circuits set up correctly?

I know I can use a driver chip to simplify this a lot, but I just want to make sure that I have the concept of H-Bridges down. Here they are: I have two motors, and each have 4 N-MOSFETs ...
1
vote
1answer
42 views

Modify MEMORY component to more sensibly Load/Store value?

I have created the following electrical circuit using Logisim: My ALU takes in 2 8-bit values and performs the operation set forth by the [Op Setter]. In particular, when the [Op] code is [100], ...
2
votes
1answer
56 views

How to ON/OFF two fans with 3-state rocker switch?

I have a 3-state switch, It has 3 pins. It can have 3 state as you can see in the picture below. when it's off (i.e on O) the middle pin is not connected to ...
-2
votes
1answer
47 views

Simplified analysis of complex circuits [closed]

This is a question in very general sense. When we got to analyze very complex schematics, is there any way by which it can be made simpler. Like do we have any key steps to analyze it with.
0
votes
0answers
43 views

How can controllers be stacked for high voltage? [closed]

I deal with solar charge controllers. Often I have a problem with not having controllers rated high enough voltage-wise. I know that charge controllers can be stacked. But can they all be stacked? ...
1
vote
3answers
103 views

Need help with an LED flash circuit

I joined just because I'm having sort of a dilemma. I need to design a flash circuit for a tiny SMD based project, and I have a way of doing it, but I want to see if I can make it better and I haven't ...
0
votes
4answers
123 views

Did I do this circuit diagram correctly?

I just need some feedback on the circuit diagram I made (it's my first time): This is for a mini-car. There are two battery packs, one connected to an Arduino UNO, and the other connected to two ...
0
votes
2answers
53 views

Are all solenoids waterproof?

I have an application where I need a solenoid to control a valve at the bottom of a tank. For unimportant reasons the valve needs to be inside the tank at the bottom. I was wondering are all ...
1
vote
1answer
33 views

Connect ALU to CPU in Logism Circuit Design and output to 7-segment Display?

I've been playing around in Logisim to get some experience in designing basic electrical circuits. While I'm sure not the best, I was able to put together a functional ALU: 1-Bit: This ALU is ...
0
votes
0answers
25 views

Possible to copy a circuit from 1 Logisim .circ file into another Logisim .circ file?

I'm using Logisim to experiment with Electrical Circuit design, and I was wondering if it is possible to copy a circuit created in 1 Logisim .circ file and place it into a different Logisim .circ file ...
2
votes
2answers
81 views

Circuit to throw out 1st bit of every 17-bit sequence?

I have a system that currently uses two Maxim DS1867 digital potentiometers in a daisy-chain configuration. In a new addition to the system I would like to use a new digital potentiometer part like ...
0
votes
1answer
53 views

Arduino Mega & LIN Transceiver (MPC2004)

I am trying to connect an Arduino Mega with another device using a LIN Transceiver. I have decided to use a LIN MPC2004 Transceiver for this. I am now trying to understand the reference design of ...
1
vote
2answers
145 views

Where can I find common circuitry implementations of different computer system components?

Mostly out of interest, I'm trying to understand common circuit-level implementations of computer components. I understand that implementations may differ widely, but I'd like to see examples. It ...
0
votes
0answers
61 views

Simple Circuit To Light Up OLED

I'm a ICT student and need to make a circuit to light up an OLED. we have developed an OLED but have some trouble with the power supply. We need to have an arduino so we can send an PWM-signal to the ...
-1
votes
0answers
43 views

How to trigger a camera if a circuit breaks

I don't know where to start with this question, so I'm going to give a bit of back story. I play Last Man Stands cricket in South Africa. We have an issue, week in week out with teams making incorrect ...
0
votes
1answer
66 views

MOSFET based H-Bridge Circuit

Okay really need help on constructing a MOSFET based H-bridge circuit with a switch. I've got two p type and two n type mosfets. I understand you have to apply voltage to the gates to turn the ...
0
votes
1answer
39 views

Delayed VCC rise time with Parallax Smart Card Adapter

While implementing a T=0/1 protocol using a smart card reader I had obtained from Parallax, I noticed a behavior when applying power to the card. It seems that once the 3.3v VCC pin is brought high, ...
1
vote
2answers
40 views

Passive Filter Negative Insertion Loss

Can someone please explain to me how a passive filter could possibly have a negative insertion loss? In the attached picture, this can be seen in the C or D curves where the insertion loss dips below ...
0
votes
1answer
50 views

Identifying a part from game console controller

I need help identifying the following part. It came out of an old console game controller. It's labeled "SUP A9 103J". Googling it did not help. It's got ten pins and it was soldered into a space ...
1
vote
1answer
285 views

Design a 3-to-8 Decoder Using Only Three 2-to-4 Decoders

Using only three 2-to-4 decoders with enable and no other additional gates, implement a 3-to-8 decoder with enable. The inputs of the resulting 3-to-8 decoder should be labeled X[2..0] for the code ...
0
votes
0answers
30 views

Power Supply Requirements [duplicate]

I am building some prototypes for my thesis but I am not sure how to buy the power source for them. I need to how to choose a proper power source(Volts, Amps, etc). The number of motors will vary but ...
0
votes
2answers
69 views

Can a combinatorial hardware circuit with no inputs solve a crypto problem?

I am noob at electronics but in short I am interested in stable states of circuit with no inputs which represents a boolean formula. Let \$f\$ be some hash function, say md5. Restrict the size of ...
0
votes
1answer
155 views

Why is it wrong to connect an oscilloscope in parallel with a circuit element?

I was told that it is incorrect to measure the DC voltage across a circuit element using an oscilloscope by putting the probe on one side and the ground clip on the other. I am supposed to connect the ...
1
vote
3answers
102 views

RC bandpass filter, what's first: low-pass filter or high-pass filter?

I want to do a RC bandpass filter can I use low-pass or high-pass at the beginning or does it have a specific sequence? First low-pass then high-pass, or first high-pass then low-pass?
1
vote
2answers
83 views

How does one implement the following function with these tools provided?

Suppose I have a function defined as follows, such that it is expressed in POS form, with the product of the following max terms of 4 variables (A,B,C,D): 0,3,4,7,9,10,12,15 and I only have a 4 to 1 ...
0
votes
2answers
55 views

Operational amplifier with reverse diode

On the first picture is a simple schematic. For example, we can get the transfer function simply by equaling "ud+u2" and "Ad*(u1-u2)". The transfer function is: u2 = (Ad*u1)/(1+Ad) - ud/(1+Ad) On ...
0
votes
0answers
39 views

SC circuit equivalent

Can someone help me find the equivalent SC circuit for figure 3? Just like in figure 2 with its equivalent circuit in figure 1. I'm just confused with the drain of M6 connected to gate of M2 at node ...
1
vote
1answer
132 views

Why is my circuit not working?

I built a very simple circuit from a schematic I found online, but it is not working. It is a touch switch circuit in which I touch a metal object connected to the circuit, and the LED2 connected at ...
2
votes
3answers
147 views

Diode Logic Gates

For some reason, I understand transistor logic gates, and I am able to solve problems, but for some reason I do not understand the and / or logic gates constructed by diodes. If someone can explain it ...
0
votes
0answers
137 views

Calculating the resistor's power consumption of 1 ohm in watts

I ran into a old-midterm exam question that calculate the one-ohm resistor's power consumption in the following diagram in watts? I need some solution or hints. I try to solve it but I think the ...
3
votes
2answers
139 views

Thevenin equivalent resistance of circuit with diagonal resistors

I'm trying to find the Thevenin equivalent for part A of this circuit: I begin by opening the circuit at the dotted line of part A. Then I try to find \$V_{oc}\$ across the two terminals that are ...
0
votes
1answer
70 views

Calculating total resistance for this circuit?

I'm very lost in my ECE class right now and I was hoping someone could help me out and explain what they're doing. I was asked to calculate the total resistance. After getting that, I was asked to ...
0
votes
0answers
94 views

What is null (Earth) exactly?

I don't know what earth (null) is. Are roads considered earth? Buildings? I hope you understand my question.