Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
My college professor asked us to take a real life problem/device and design and solve its circuit using transient response and Laplace transforms. It has to be a simple circuit, maybe just some capacitors, power source, switch and resistors... My biggest problem is finding a connection to a real...
As part of a broader project, I am designing IC circuit using CMOS to one of the first steps I'm working on is the filtering a series of pulses with of the noise. The actual pulses are around 1 kHz so I am implementing 2nd order sallen-key high pass filter. Since the capacitance is limited to...
There is the code
’npn transistor
vbias 3 0 dc 5v
vs 1 0 dc 0v
rb 1 2 20k
rc 3 4 2k
q 4 2 0 mynpn
.model mynpn npn (BF=175 IS=1e-17 VA=75 BR=2)
.dc vs 0 5 0.5
.plot dc v(3) -i(vbias)
.end ’
But the output is showing a negative going down. How to get the graph of the plot with this app called...
The code is here,
Diode Voltage Drop
r1 1 2 10k
r2 2 3 5k
r3 3 4 4k
r4 4 0 3k
vin 1 0 dc 10
.print dc v(3,2)
.end
As you can see I am trying to get a voltage drop between node 3 aand 2. But the print function is not working properly. It is just showing the usual outputs of( the ouput is...
I am trying to build an escape room puzzle, where someone holds a key fob up to a sensor and a maglock opens, and I went online to buy something that I assumed was ready-in-box but instead they sent me the photo attached which I'm 99% sure was originally a car immobilizer and is now being used...
Simple LED circuit doubt.
Assume : I have a LED with forward voltage of 3.0 V and forward Current of 350mA.
With 9V battery, i would be calculating the required Resistance with the Ohms law :
R = ( Source Voltage - Forward Voltage) / Forward Current.
Here we dont consider the Current Ouput...
Hello everyone, I'm working on my thesis and came to a point where I can't interprete a part of a circuit I'm using.
This should be an adaptation circuit, so I am guessing it's filtering my signal in some kind of way, but cannot say with certainty which kind of filter should it be.
I could say...
Hello good people,
I need help. I'm posting a schematic of an ultra low noise amplifier. It is to be powered by batteries. For that reason, I need a stable DC solution in the place of R4 resistor. I was proposed to achieve that by using another JFET and an integrator circuit, but I am not...
Hello everyone, this is my first thread here.
I am using a 60W soldering iron which has a temperature regulator on it. I have never seen anything like this. Also this iron has a ground crockodile clip which saves me from the unnecessary shocks.Also it is automated. It turns off/on all by itself...
Hello. I am an electronics beginner. I would like to understand a circuit that is in a book from the 1980s entitled "Computer Controlled Robots", published by Usborne. May I ask here?
1. The book does not specify the exact model of relay to be used, merely that it should be within certain...
I have a project, first i need to find a circuit to Analyse/study the Frequency Response of Heterojunction Bipolar Transistor. Then simulate that circuit on SPICE (i'am using Orcad Cadence).
Can someone help me finding a circuit as mentioned above???, I'm having difficulties finding one. Any...
Here is a Music Spectrum using NeoPixel RGB LED Matrix and ARM microcontroller.
I used the online circuit design tool EasyEDA.com to draw the circuit.
This link is my competed circuit diagram and PCB, where you can see it very clearly.
Hey guys
I just uploaded my tutorial on how to build a simple audio amplifier using an LM386 chip. When using the maximum supply voltage it can reach a power output of roughly 1 watt. Hope you find it useful.
Schematic <Mod edit: If you have something to share, please post it here. Do not...
Hi and thanks for viewing!
In the past I've used a few buck converters off ebay. So far they've done me well, but I'd prefer to have the ability to build my own. That way I'm in control of the quality of components used. I was planning on using the LM2678T-AJT as the heart of my buck converter...
Hello, I have seen some time ago a youtube video that I want to replicate.
The idea is to to input the main walls into car's ignition coil. Of course, I want to make it taking precautions.
The circuit uses a dimmer to chop the AC and also a capacitor to regulate how much current flows into the...
Homemade Adjustable Dc Voltage Regulator by circuit, and you will learn about Dc Voltage Regulator and circuit by practical design and we will use lm350k.
About adjustable dc voltage regulator design
You will be able to edit output voltage by Variable resistance in the circuit, and the range of...
Hello
Is this fuse of some sort? or just an empty space for installing pcb based fuse socket?
**broken link removed**
**broken link removed**
This is the circuit board of my new cheap dmm, my last one broke when i mistakenly inserted the leads in mains while the red lead was in 10A socket. I...
Hello
I am thinking of building the below circuit but i am short on components. I have all the others except SL100 transistor and BT44 triac which i can't seem to find in any local store. If anyone can tell me what alternative components i can use for these two then please let me know i would...
I got a high voltage regulator (Discrete using BJTs)..Attaching the circuit..would like to calculate the biasing values how its been arrived..the load at Q2A switch from 0 and 1.3A..If any one can help on theoretical calculation would be helpful
Maybe you all can help!
I am a physics major and electronics is not my strength.
Here’s the situation: I have certain materials with which I need to accomplish a certain task (that being, to make my zoetrope)
I. The task
• Make a stepper motor rotate at certain rpms.
• Make 5 LED’s flash...
Hi
First I apologize if my spelling isnt correct, I am from Croatia and I am not so good with spelling English language.
I am new on this forum and I am interested in making this circuit but I dont know a thing about microcontrollers and things like that, because I have never made some circuit...
Hello,
I know near nothing about circuits and am happy to learn what I need, to get this repaired. Where do I start?
I have a bluetooth music receiver with digital out (toslink coax) purchased from overseas. I connected an incorrect power supply and it no longer works
(I first connected the...
Hello everyone, I am new on the forum. I have a older kenwood kac-7251 2 channel amplifier. It still works great except one problem, it is causing a parasitic drain on my battery. Started about a month ago, I am a auto and diesel technician so I checked parasitic draw, pulled my amp fuse and...
Hey guys.
I'm designing a series pass voltage regulator with feedback. I'm trying to disconnect the load when the load current or control element temperature exceeds a value. The attached photos show my circuit design.
The temperature cutoff circuit works as is, but the current cutoff does...
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