Questions tagged [diy]

Do It Yourself. Build, modify, repair something without the aid of trained professionals.

2
votes
3answers
6k views

Safety when using ATX power supply as benchtop supply

I found many pages where people convert an ATX power supply to a benchtop power supply to give 12, 5, 3.3V. However the current output can be very high (several amps). When using this and you NEED ...
4
votes
4answers
49k views

Mains LED light bulb flickers when switched off [closed]

We have LED bulbs in our apartment. In the bathroom, the bulb flickers on and off when it's switched off. Same when it was a CFL bulb before I switched to LED cause I hate CFLs. Our mains voltage is ...
0
votes
3answers
816 views

Splitting mains power into multiple relay-switched circuits

Summary Introduction My goal is to split a 1-gang mains power extension lead into three, have my Raspberry Pi plugged into one of the outputs, and have the Pi able to switch the other two outputs ...
-2
votes
1answer
67 views

Downloading custom audio in musical toys DIY [closed]

I am a computer science student and recently interest built into electronics . I want to ask how can i download custom audio in musical toys like this . All i have is this kind of phone toy, Please ...
-3
votes
1answer
679 views

How to make a 240v ac to 12v 2amp dc transformerless step down circuit [closed]

I want to make a 100-240vac to 12vdc 2amp transformerless stepdown circuit any safe reliable circuit digram is accepted
2
votes
1answer
3k views

Proper storage of ferric cloride PCB etchant

I etch about half a dozen printed circuit boards each year at home, using an aqueous ferric chloride AKA iron(III) chloride etchant solution. As I want to minimize the costs and hassle of buying new ...
1
vote
1answer
890 views

How charge custom Li-ion pack 36v 10s6p

I have 10x 6p 18650 batteries. 13AH. I found a protection circuit. My issue is that I don't know how to charge the batteries. I could use a power source but I got it from my school and it isn't mine. ...
1
vote
1answer
218 views

Electronic Temperature Control Sound Light Alarm DIY Kit - how does it work

I bought a DIY Kit off ebay (the board says www.icstation.com ICSK061A), and lo an behold, it does not work. I could not figure out what the trouble was, so i simulated it in LTSpice, but i got no ...
-6
votes
1answer
97 views

Explanation of Circuit? [closed]

Circuit for Time Controlled Switch Can anyone please explain how this circuit is working? It is basically a time controlled switch? I want to know what is the functioning of each component i.e, ...
1
vote
1answer
183 views

Interfacing RAM to a DIY computer

I am a relatively newbie to electronics but hopefully this question is not very non sensical: I am following a guide to build a 8 bit computer. The guide requires a RAM which has a 4 address bit and ...
2
votes
2answers
507 views

Satellite detector and a mobile phone

A satellite dish with LNB connected to a satellite detector when powered by a 18v source could detect radio waves from satellites. I made one using the ppt here. The detector, (when it was not ...
3
votes
3answers
7k views

How do I check polarity on loudspeaker?

How do I check the polarity on a loudspeaker? I have an 8 ohm 2 inch speaker with no wires soldered into it and the terminals have no markings. How do I know which of the two terminals is positive ...
2
votes
3answers
3k views

An appropriate voltage regulator / limiter for a 5V solar panel for USB charging?

I'm building a USB solar charger for my tablet, which has so far worked well. I'm using a 5 Volt, 5 watt solar panel (same as this one), which outputs about 4.5V and 0.6A in real use when charging my ...
-1
votes
1answer
440 views

Need help how to backup cellphone… i need output power 5v 1a from AA battery

How do i get the amount of 5v 1A for my backup battery for my cellphone unit? from 4pcs of AA battery(each batt is 1.5v 2500mAh) to 5v 1A been searching for a while ago 1,is it better to use a 7805 ...
0
votes
2answers
484 views

RF power limiter

I am interested in constructing my own version of an RF power limiter. There exist models such as the 11930A Power Limiter, but are very expensive. The intended use for the device is to limit input ...
0
votes
2answers
1k views

Has anyone built an rs232 to usb converter?

I want to implement serial communication into one of my projects, but I'm hesitant to use a serial cable due them them being exceedingly hard to find nowadays. I found an old converter and took it ...
0
votes
1answer
274 views

Difference between line scan sensor and line scan camera? [closed]

I'm looking to build a multitouch table using line sensor/camera technology. I was hoping someone had already tried such a thing and could recommend the best suited between line scan sensor or line ...
0
votes
1answer
59 views

PSU with dc stepdown buck

I want to connect different LEDs that have these parameters (the LEDs I am using are just generic LEDs I got from ebay.): Led 1: 6.4V - 7.2V @ 0.7A Led 2: 2.9V - 5.6V @ 1.9A Led 3: 8V - 12V @ 3.4A ...
-2
votes
2answers
149 views

How to gather data about how weight is distributed by feet on a plane over time? [closed]

I have seen a graphical representation of a person's bare feet and how their body mass is distributed across their feet bottoms by color coding the pressure at each coordinate and over time showing ...
0
votes
2answers
124 views

Trying to Fix my remote for my house Fan, is this component a fuse?

Decided I would try and fix the remote for this 3 speed fan I have a home since it is summer now. Here's the circuitry I'm dealing with here: So here our are some notes: There was some battery ...
2
votes
2answers
1k views

Is there a simple way to DIY a coaxial male connector?

I have a 12V power supply that has a female coaxial plug like the one on the right in this image: I rigged something up with tinfoil just to see if it would work, but it's not ideal at all. Basically,...
1
vote
1answer
1k views

LED Shoes - circuit diagram ok?

I want to put LEDs into my shoes, specifically the Nike Air bubble (by drilling holes at the inside of the shoe and dropping them into the bubble). I also want the ability for it to light up when ...
5
votes
6answers
2k views

Would it be possible to make a solid state transistor by hand?

I am curious, would it be possible to fabricate a modern BJT/FET transistor with hobby/garage tools only if size and aesthetics was not important? Which materials would one use and how would one ...
0
votes
1answer
1k views

How to hack my Nespresso Lattisima [closed]

This morning I woke up wanting to drink a cup of coffee and, as usual, it annoys me that I have to turn on the machine only to wait a minute before I can begin brewing. I want to be able to turn on ...
1
vote
0answers
71 views

Making a 1m sized 16x24 screen so that the picture is recognizable

I'm thinking about making a flexible LED screen with 16x24 LEDs. I want the screen to be 1m wide so it will have big gaps between the LEDs. Because of the big gaps I think the image may be ...
0
votes
1answer
742 views

Which battery should I use to power arduino+motor shield + two motors

I am using two motors ( from old two drill machines - same kind, these are 3.6v motors ), connected to arduino + arduino motor shield seeed studio v2. I tried to use 18v/1.2a battery that was laying ...
0
votes
1answer
50 views

Active electric motor for on specify voltage

Is it possible to power on electric motor ( a little ) only when the input voltage is 1V by example. The electric motor is supply by another source (9V by example) With diode?? Or something else? I'...
0
votes
1answer
168 views

Use a steel welding table to ground yourself from electrostatic discharge (ESD)?

I have a large steel welding table that I have been using as a work station to solder together my own custom PCBs. I have been using my anti-electrostatic discharge grounding bracelet and connecting ...
2
votes
1answer
4k views

inkjet cartridge control [closed]

I would like to build this: https://www.youtube.com/watch?v=UjlHtHAN0DU I.e. a programmable stamp/printer that you slide along a piece of paper. I would like for it to use easily obtainable ...
1
vote
1answer
269 views

Binary Encoder Circuit

How exactly would I go from 7 output lines to 127 outputs. Since you can encoder a value of 127 with 7 lines I would imagine this should be possible.
2
votes
2answers
383 views

Acquiring an accurate clock input for my computer

Building a timegrapher is quite straightforward, it is nothing more than a piezo transducer connected through to an amplifier. However, in order to actually utilize the results, one need an accurate ...
0
votes
1answer
169 views

Rewiring a 12V charger

I have a Windows tablet with a charger which crapped out. The old charger was 12V / 1.5A - fairly standard but it had a rare tiny pin connector. Rather than buy a new charger, I decided to cannibalise ...
1
vote
0answers
3k views

Best heating cable for a DYI heating blanket

I want to make an electric/heating blanket that will work with heating electric cable. I will use a computer AC adapter that output 19V 3.16A, and this dimmer to regulate the heat and a heating ...
3
votes
2answers
454 views

Connecting home elliptical trainer to TV power

I'm attempting to use a TV addiction to help motivate an exercise routine. To do this, I am going to connect an elliptical trainer to the power of a television set (flatscreen). Here is my plan: I ...
1
vote
4answers
6k views

Is it possible to use a lead-acid battery as a power bank? [closed]

I have an Oxygen 6v 4.5Ah lead-acid battery. Can i use it somehow as a power bank to recharge my cellphone? Your response and help will be greatly appreciated.
9
votes
1answer
1k views

Soldering BGA components DIY

If I understood correctly, current BGA components contain solder balls under the package. Do I still need additional solder paste to put on the board, or the amount of solder on the component contacts ...
2
votes
1answer
14k views

Creating a home made ultrasound transducer

I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
0
votes
1answer
4k views

How to increase the read range of an active NFC tag?

I want to read a NFC tag at a distance of 1m from my NFC enabled smartphone. Is it possible to do so by enhancing the antenna of the NFC tag (not the one on the phone). Size of the NFC tag is not an ...
1
vote
3answers
812 views

Automatically measure voltage over a wide range

There are voltmeters that can measure voltage over a wide range without the need to switch the range manually. I'm quite curious how do they do it, because I'd like to make a tiny device capable of ...
0
votes
2answers
418 views

How to drive a plain LCD panel (get it to work with DVI)

I have an old iMac G5 laying around I want to transform it into a second monitor, but without any extra software on the device, but by just controlling the screen panel. I dissasembeld the iMac and ...
0
votes
1answer
3k views

Design and build a single board computer [closed]

I want to learn how to design and build a single board computer like the Raspberry Pi. I saw a DIY project on Hack-A-Day and design something like the board in the DIY project but a bit more ...
0
votes
3answers
109 views

What type of motor is this?

So I recently bought a motorised pedicure set thinking it would be some amazing thing. However, I used it once and the batteries (4 AA) died after about half an hour and not before getting ...
3
votes
3answers
1k views

Is my PSU design safe, what should I change?

Normally I would just go and breadboard the design out, but since this is using mains power, I would rather ask experienced people first. I want to build a desktop 170V DC power supply to fiddle ...
5
votes
4answers
736 views

Why did my homemade PCB turn out like this?

I did a first experiment with the UV-lamp + Transparency + Presensitized-Board method. Using a randomly drawn pattern, this was my (promising but unsatisfactory) result: What could typically be the ...
-3
votes
2answers
5k views

wiring leds for car brake lights without throwing warning lights [closed]

Im working on led tail lights for my vehicle. the standard bulb is a 21w 12v bulb. what i need to try and figure out is whether or not i am able to recreate this same load using leds without a load ...
5
votes
3answers
262 views

What kind of equipment would I need to apply nonpermanent extension wires to test points of a PCB so I can access them via a microcontroller?

This is a DIY project. The title question is the first problem I'm considering, but the entire project is the goal I'm not an expert in hardware, but neither am I uninitiated. Put me at around an ...
2
votes
1answer
2k views

What's wrong with my voltage multiplier segment?

The moment I learned about voltage multipliers I was really excited. What an awesome way to kill yourself! I found a high voltage multiplier guide and using the image below, I created my first ...
1
vote
2answers
915 views

DIY passive RFID? [closed]

I'm interested in building my own "DIY" RFID scanner and tags. For the scanner, I think I would just need: Transceiver Some kind of hardware polling mechanism to have the scanner scan, say, every 2 ...
-2
votes
2answers
594 views

Is it possible to run 230V LED - or flourecent “spiral-tube” - lightbulb with a 9V battery?

I would like to power a 230V LED lightbulb with a 9V battery. I assume I'll have to dissect it... Surely there must be some sort of power-converter and rectifier from 230V-AC to something a lot ...
2
votes
2answers
327 views

Google Glass 3.5mm jack with battery neck strap

I'm thinking of improving my Google Glass by DIY building a micro usb to 3.5mm headphone jack with a battery connected to a neck strap out of parts from the internet. I've already built the neck ...