Questions tagged [diy]

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

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1answer
492 views

Inductive Charging Mouse [closed]

I recently bought a wireless gaming mouse and while functionally its great, the battery life is a little less than I would like. I tried to mitigate this by adding in another rechargable AA battery (...
2
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2answers
359 views

Is this an RC filter in the circuit for a nightlight?

So there is this nightlight (a little flower that you plug in directly into a mains socket and switching it on gives you some light to light up your bedroom at night) which I dismantled and tried to ...
2
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1answer
17k views

Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy): I have an earphone splitter for iphones that has ...
-2
votes
1answer
486 views

Detecting open circuit, very low power

We need low power consumption (1nA - 1uA) while the circuit is closed, and then wake the microcontroller when the circuit is opened. A the moment the design includes a custom metal switch which will ...
0
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3answers
7k views

Wiring of a USB Y-Connector [duplicate]

Recently I bought an LG External DVD Writer that is TV compatible. But after a couple of times it stopped working on my Sony LED TV. It would start spinning, but stop after two seconds. This would go ...
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1answer
100 views

Using european telephone cables for own DC power delivery

I have european telephone cables running through my walls to each room, without any connection/socket. Well... we really do not need any hard line telephone connection and I am into DIY projects, so I ...
0
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1answer
57 views

Need help making a forced air heater

I would like to make an electric heater. It will have a 20" Lasko Box fan at the back, pushing air passed the Kanthal A1 resistance wire. I would like to use 120vac. It will dissipate 1000 watts, and ...
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3answers
677 views

Variable low voltage AC supply for heating element

(I'm a begineer in electrical stuff). My wife needs a transformer for a leather electric creaser. The transformers sold on the market are ridiculously overpriced (more than 250€). I don't ...
-1
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3answers
360 views

Need to build a compact power supply that runs off the 240V socket and provides 12V, 5V and 3.3V for an Arduino Project [closed]

I want to have an as-compact-as-possible (but no limit on size) power brick/supply that takes power from a UK Wall socket and has multiple outputs with different voltages. Need 12V@2A for stepper ...
2
votes
2answers
872 views

Smallest 2 Pin AC outlet socket [closed]

For a home automation project I need to source panel mounting electrical outlet sockets which are as low profile as possible and are rated at least 200 watts. Something like a female version of these ...
0
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1answer
303 views

K018A DIY Kit 200V 500W Light-Dimmer Module - will it work w/ 120v or is modification required?

K018A DIY Kit 200V 500W Light-Dimmer Module - will it work w/ 120v 60Hz? Or does it require modification to do so? Bought this DIY Kit for further practice with my soldering iron, and also to tone ...
4
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3answers
7k 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 ...
5
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4answers
58k 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
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3answers
1k 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
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1answer
70 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 ...
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1answer
838 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
4k 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 ...
-2
votes
2answers
150 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 ...
1
vote
1answer
963 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
258 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 ...
0
votes
1answer
6k 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 ...
-6
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1answer
99 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
186 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
584 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 ...
0
votes
2answers
457 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 ...
3
votes
3answers
11k 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
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3answers
4k 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 ...
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1answer
472 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
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2answers
526 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
1answer
277 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
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1answer
61 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
2k 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,...
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2answers
129 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 ...
0
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1answer
2k 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
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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 ...
1
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1answer
271 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.
0
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1answer
771 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
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1answer
173 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 ...
2
votes
2answers
415 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
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1answer
200 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
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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.
5
votes
4answers
766 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 ...
1
vote
3answers
888 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
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1answer
4k 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
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3answers
113 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 ...
0
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0answers
610 views

How to switch a transistor when a radio signal is received?

I have a circuit which switches on by sending current to the base of one of its transistors. I'm trying to make receiver which can receive signals from a AM transmitter and send current to base of ...
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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 ...