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.
So i have this old Calculator BAMBALIO BL-991 MS And wanted it to work us notepad So basically can i make it as a notepad like using specific combination the notepad mode appears and it will also work as normal calculator ,So can i add my custom text into it?!Asking for a friend .
Can i make a circuit (like a megaphone)
I tried two designs but didn't work
The components I used were
The mic ,a 0.5 watt speaker ,a BC 547(bc547C V1 E) transistor, a 10k and 100k resistor, a 104 ceramic capacitor and a 3.7v battery.
I wonderer if somebody can help me with this? The Public Safety Communications Research (PSCR) program is researching the development of in-building apps for RF coverage evaluation, which is critical for enhancing in-building coverage for public safety. The apps will turn a representative public...
Hello, first time on a Electronics Forum, hope I can get some help..
Any direct answers or links to where I can learn note about his (PDF, YouTube, free/paid course) are highly appreciated!
I am trying to create lighting systems for the lamps I make. Want to incorporate:
-RGB LEDs...
I have designed a program for the microcontroller and it works well, and I only need to put a welcome message at the start of the operation, which disappears for 2 seconds forever, and does not appear until I restart the microcontroller, and the program after that completes its functions well...
Hello everyone,
I have a problem and I thought I should post it here because I can't quite get the hang of it.
I was tasked to make a circuit that is made of only NOR-gates. Seemed simple at first but then the restrictions came in.
The circuit needs to be made out of 4 NOR gates with 2 inputs...
Hello all I have been attempting a repair on a Archt one speaker for about a month now and I just can’t figure it out. I’ve probed around, I’ve tested the speakers in a home theater just to make sure they work and they do just fine, but when put together I get no sound through BT or through Aux...
Hello, I am new to this site and I am hoping someone could steer me in the right direction. I am trying to determine if there are any devices/sensors// I could use (that are minimally invasive) and perhaps could be used in conjunction with a smart device, to determine if point A is level with...
Hello, I discoverd a item taped with Black tape under my car a few days ago. I have tried Google image and I still have No clue what it is. I have a reason to belive it might be a kind of gps but would like to know for sure what it is. Does anyone know what it might be?
So I am switching out custom motor controllers for an ebike. But need help identifying the purpose of the wires indicated on the pcb.
In the pics I have highlighted the appropriate acronyms with its wire color. As you can see right off the bat I have one problem. One controller has 6...
I am a final year product design student and desperately need advice on how the internal technical aspects of my product will work! It is a skincare (face only) dispenser with 5 individual 100 ml tubes that house the liquids. It will sit on a surface in the bathroom environment. I imagine each...
Hi all! Thanks for creating this amazing online community.
I'm currently working on building the "Example #1" circuit listed on page 19 of 26 in the datasheet for the Nuvoton ISD1730PY chip (image attached). I've attempted to translate the schematic into a breadboarded circuit, which I've...
Sorry no real TLDR. Hi all I'm an apprentice mechanical engineer (So a failed EE). I've had this project that is both about the wiring for an electric guitar and some more complicated wiring. It is probably at this point so far beyond me and apparently all of the guitar community (I've been on...
Hello Everyone,
I built the circuit below with the PAM2423 Boost converter IC.... Here is the datasheet.
I am wanting to use it to get about 3-4 Amps of current at 5V out of a 12,000mAH Li-ion Battery Pack, which will put out between 3V and 4.2V....
I built this exact circuit with only 2 small...
Hello Everyone...
I am trying to make a Low Voltage Buzzer Warning that beeps on and off, without a microcontroller....
I have a latching detection circuit here that puts out about a 6V signal until the battery is dead, then it drops off and latches off until it is reset....
This is the...
I chose to make a Calculator for my "Microcotrollers and Its Applications" course's Project component. I'm not really good at ASM progrmming, I'm more of a C guy (I'm not really good at programming microcontrollers though), but my faculty said the projects MUST be coded in ASM language. So I...
Hello Everyone,
I am making a custom circuit board with many different parts(dc dc converters, chargers, battery management, battery protection, isolation, etc)....
The product is to run on 18650 Li-ion battery cells, and if you are wondering why I don't use the ones with built in protections...
I would like to fully charge then discharge the capacitor using the two switches . Charge for 50s then discharge for another 50s seconds. Please help me. I am not getting the capacitor to discharge pass half the source voltage.
Hello, I'm a noob at electronics so hopefully you guys can help me out;
I'm trying to make a circuit that uses a transistor as a switch to a fan, the idea is to have a thermistor connected to the base of the transistor while the collector and the emitter to turn on a 5V fan when the thermistor...
I have this circuit built, and the first batch of 6 pieces all worked.
Now the second time, I made 4, and only 1 works, the others all do the following.
When the voltage goes below 16.2V, the output drops to 7.8V and something buzzes softly. The voltage then after a bit, does go down to zero...
Hi,
I need help to anyone who can help me :)
I want to connect a Peltier Element to a 3.3V power supply . I use TEC-40-33-127.
I attached below some specifications of the device.
I need your help because I don't know how to make the circuit schematic I don't know what values to choose from...
Hello,
My name is Daniela, I'm student and I need help to anyone who can help me :D
Project goal: Control the temperature inside a closed chamber
I need help to connect the all components and I don't know how because I'm new in this .
I don't know how to amplify and to maintain the current...
Hello, I would like to build a battery powered arduino gps speedometer.
In this arduino based project I would like to include a few features.
-I would like it to turn on some lights when It detects that the speed is going down (if the speedometer is going at 10km per hour and slowing down I...
To anyone who can help me, PLEASE!!!!!
I have a circuit board I am working on that is to have 3 outputs...
12V at 1-2A, 6.8V at 1-2A, and 33V at a higher amp rating, about 3-4A...
I have the designs attached below, and I have the board here. I have assembled 2 boards, and neither of them is...
Hello everyone.
Hopefully this is the right place to post this, I've been asking all over the internet for help identifying this object I have pictures of and this place seems like an active place to ask. I'm not the first person to try identifying this, but I do believe I've been the most...
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