Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
67 questions with no upvoted or accepted answers
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DIY project, encountering difficulties with solenoids
I'm currently working on a project that is supposed to dispense something out of a container after receiving an input.
I have a solenoid that connects to an interior hatch. It will open up a hatch ...
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3
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1
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754
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Need help identifying the 4 microphone wires in my laptop webcam
I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
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257
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RF signal Multiplier or Chopper
I'm trying to design a circuit that "multiplies" two signals.
I have an electrical unit with two separate circuits. One circuit drives the other one with a square signal. The width of the square ...
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2
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Approaches to creating better mouse pointing hardware for absolute input?
I play the video game osu!. Osu! is a game that requires the player to quickly move the mouse pointer to different areas of the screen in a precise manner.
A game such as osu! lays out unique ...
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47
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Need Help with DIY Phase sequence meter
I have seen this video: https://www.youtube.com/watch?v=HyrhW_gnQEM and I am really interested in creating DIY version of this for induction motor. Surfed through internet, but could not anything ...
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131
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Use 2s LiPo Battery as Battery Cell for Microcontroller
Is there a convenient way to use a large 2s LiPo battery (such as this one) as a power source for a microcontroller and LED strip? Specifically I'm looking for the ability to seamlessly switch between ...
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1
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169
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How to prevent a nichrome wire from melting under variable energy?
I’m experimenting with a DIY “sand battery”.
The “battery” is a pot lined inside with an insulator and filled with sand. The sand is heated by a nichrome wire placed at the bottom. The wire is ...
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1
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298
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Detailed calculations for DIY SSR (solid state relay) circuit
I just want to understand the calculations for a DIY SSR project.
I do know the components required but I don't know how to calculate resistance values for this circuit. Also, what is the output of ...
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76
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18650 capacity tester opamp voltages on inputs different
I assembled an 18650 Li-Ion capacity tester with an Arduino Pro Mini.
Here is the schematic:
When I set the discharging current to 100 mA in the code (which means there has to be 100mV on pin 3 of ...
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1
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1
answer
74
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Powering 12 LED tea lights with recycled power adapter?
I have 12 tea lights that are each powered by a C2030 3 V battery.
Like many of us I have a box of various chargers and whatnot.
Is this as simple as finding one outputting 3 V and splitting it 12 ...
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1
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82
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Timer circuit does not work as intended (fixed)
I am trying to make a 1 Hz clock with a CD4060, a crystal oscillator and an Arduino UNO.
The problem is I am pretty sure the circuit does not work right. It oscillates but it is slower than 1 Hz.
I ...
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501
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How Can I Get a Stable Triangle Wave With Adjustable Frequency
I am trying to make a wave generator. It will have switch modes for frequency between 1.6kHz to 1.6Hz with x10 increments. Everything is set except the triangle wave. I use a wien birdge oscillator to ...
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1
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258
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Remote Operation of Toggle Switch
I'm working in a laboratory environment, where we need to change the state of a few toggle-switches from time to time. As we want more and more remote control in our lab, these toggle-switches need to ...
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1
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214
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Removing one strip of LEDs from panel
My LED panel broke (it is a ceiling lamp).
I disassembled it, and it looks like this:
It has a series of LED strips (the last one is missing in the image), connected in series. There are connectors ...
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1
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57
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Electrical energy transformation
I'm working on a DIY solar inverter.
The goal is to make the battery connected to it rechargable by both energy from solar panels and AC mains (if there is power supply.)
My battery is 24V DC, AC main ...
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1
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175
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DIY high fidelity audio using delta sigma adc
This question may be too general, but I will include all the details that I can. My end goal is to achieve a super high-resolution spectrogram of any recording I choose to make. By doing some tests I ...
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12VDC Switching to 17VDC high amerage
It's been years since my undergrad work as an EE. I am a physicist and medical researcher now, but, as a startup, we all take on anything we can.
Let's face it... 12VDC high current PSU's are cheap. ...
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308
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3.5 male to IR Transmitter - Receiver [amplified] back to 3.5 female
Trying to recreate a DIY headphone with IR transmitter and receiver
I already searched this is what I have found so far:
1.- http://www.instructables.com/id/DIY-Infrared-transmitter-for-iPhone-iPod/ [...
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4k
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How to produce electricity with mechanical power/spring coil
As a home project I want to make a electricity generator which uses a spring coil, which when turned/wound(just like the mechanism in wrist watches) enough times will start unwinding and generate ...
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74
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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 ...
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6k
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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 ...
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32
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Connect LED tapes using FFC or other flexible cable to go around obstacle
Two led tapes of width ~1cm sit 1cm apart. Between them in the middle, there's an obstacle around 3mm thick. I want to connect the LED tapes with a flexible cable that goes around the obstacle. FFCs ...
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54
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DIY ATX Desktop PSU turns off after using full load fast
I have built a desktop PSU with a fuse, output connector and a buck boost converter. The problem is that when I set the maximum power of the converter at once, the PSU turns off automatically. However,...
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77
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DIY board: double-sided SMD vs. joining two boards flat together?
I have this rough layout for a design with some serious space constraints:
It has connectors on both sides and the layout rules out through-hole soldering. I only have access to a Hakko IR preheater ...
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0
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1
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37
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How to find the matrix layout of an old EEPC keyboard
The title asks my question; how can I find the matrix layout of an old EEPC keyboard. I found an instructables about making a USB keyboard controller but it uses a Teensy microcontroller, and I think ...
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0
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29
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Seeking Advice on Battery-Powered MCU Circuit with TPL5111 Timer and MOSFETs
I'm putting together a circuit using a TPL5111 timer to switch power to an MCU like a PICO or ESP32 from a LiPo battery. I've got two MOSFETs - one for turning the power on and one for turning it off. ...
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0
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1
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146
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What is the "best" way to make a DIY 7 V rechargeable battery?
I have a device (the Wii "sensor" bar, basically an IR LED array) that the literature says takes 7 V. I can't find any battery offerings that come in 7 V, but many that are 3.7 V, so I am ...
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136
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How to make a recent laptop touchpad work on PC with an external PS/2 USB adapter
I want to make a laptop touchpad work individually with a USB adapter, but failed, on a recent Thinkpad E14 touchpad part.
Some articles on the internet said they succeeded connecting the touchpad ...
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0
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1
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112
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How much pressure can typical TEC modules withstand?
Since I have not found an answer online. Nor any data sheets specifying, I can conduct my own test. But why not then post it online for others to see, I'm sure others will be searching it in a ...
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57
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24 V Door Bell Modification
I'm looking to create a custom doorbell and am looking for advice. I am retrofitting a traditional 24 V doorbell system. My output I'm looking to get when you depress the doorbell is 5 short bursts of ...
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438
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12-lead ECG circuit diagram
I am trying to build 12 lead ECG circuit for my project, so could someone explain to me what should I do about allocating the electrodes on this diagram? Where do they need to be attached?
Source: ...
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91
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Convert a 5 pin Elno connector to a 3 pin XLR
I'm trying to modify a Elno laryngophone's connector (5 pin) to plug like a normal mic so I need to understand how to wire cable to a standard XLR connector, maybe somebody knows how to do? thank you
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How to recell a 60 cell 36V battery pack?
So unfortunately a disgruntled ex-housemate put a screw through my friend's electric bike battery pack.
It has burst one cell so we're definitely not plugging it in.
I think I'm capable of replacing ...
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1
answer
98
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Electric guitar with active electronics and a DIY battery gauge
There is a primitive DIY battery charge monitor which blinks a LED after input voltage drops lower a certain level. Let's call it battery gauge. Also, there is an electric guitar with active ...
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166
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What winding pattern would be the most efficient for generating electricity?
I'm looking to build a hand crank or pedal powered generator for a personal project, almost completely from scratch. I'm making my own coils, and looking to see what pattern would be the best for it, ...
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55
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Analog motion triggered alarm design (amateur) - Seeking professional's advice
I've designed a circuit and I want to confirm if it will work. Below is the working:
A very low current, battery powered motion alarm.
User can set 3 timers (srm delay, alarm go off delay, alarm ...
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82
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Smoothing quickly changing current/power draw for easier measurement
I want to measure the power consumption of an IoT device with LoRa module.
I read quite a few posts about this topic and two issues come up regularly:
the high dynamic range needed and
the high ...
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0
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81
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Charging DIY 3s1p Battery pack as NiMH replacement
I have an old appliance with a completely dead NiMH pack (about 0.2V per cell) and to blow new life into it I want to replace that with a lithium-ion pack.
The old pack was 12V so I was thinking of a ...
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0
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553
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DIY transformer winding, "Light bulb test"
I "hack" cheap "electronic transformers" for use as filament supply for my tube amplifier projects. They operate at about 50KHz so there is no audible hum (a particularly annoying ...
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743
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Implementing A/D conversion circuit to a DIY clamp meter
I was looking for cheap clamp meter projects and found this one: DC non invasive current clamp for oscilloscope DIY.
After reading about this project, I noticed that it had a BNC output to read values ...
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375
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What type of motor to use for a crank-style window opener?
I'm trying to build an automatic window opener for my crank-out style casement windows, but I'm a little stumped on what sort of motor to use. I need something with high torque and a good feedback ...
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I can't switch on both coils in double arc lighter transformer
I was trying to make DIY plasma lighter (and kind of made it too) but I can't figure out something.
The transformer has 2 primary and 2 secondary coils so I made a NE555 signal generator with 36 kHz ...
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1k
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How to stop LED EMI on capacitive touch sensor TTP223
I am trying to make a piece of wood touch sensitive. I have a piece of wood carved with runic letters.
I inserted LED's inside then filled the letters with epoxy resin.
When I touch one I want the ...
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0
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1
answer
158
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Astable Multivibrator using BC549s not oscillating
I just recently started learning about electrical engineering stuff, and since my final goal of building a Z80 Computer seems a bit far away, for now, I decided I'd make a simple clock I could ...
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742
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Why does my USB-C PD trigger circuit not work in tandem with a DC-DC voltage step up module?
Good day internet humans,
I am pretty new to the world of diy electonics, and am in the process of putting together a DIY portable computer monitor built from an lcd panel from an old laptop and a ...
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0
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87
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DIY LED Fixture/Panel Design Questions - 1. How to control each RGB channel (COB) or 2. How to cool a panel of 40 meters of LED strips
I'm looking to build a 1kW LED light fixture for an experimental photographic process.
I need 1kW fixture or around 100,000 lumens because of the low sensitivity of an emulsion.
I'm wondering if ...
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0
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0
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495
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Is it safe to reconnect burnt wire in tower fan?
I have a tower fan which was starting and stoping at intervals. Taking it apart, I found that a wire connecting the mains plug to the appliance has burnt in half. You can see the blue wire at the ...
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108
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I have an MZ4 thermistor, I can't find info about the value of capacitance
I have bought a self assembly kit for power source (based on the LM317). The provided small thermistors are tagged as MZ4. I did my research but couldn't find the datasheet. The PCB is showing them to ...
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95
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12V Alternator charger using MOSFET with 3 x 12V output charging serial connected batteries ( 3 x 12V)
I am planning of building charger for trolling motor that will charge from single alternator 12VDC three serial connected batteries with three individual 12V outputs. This is something that is ...
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0
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148
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BDCM for small DIY overhead stirrer, how to choose based on Kv?
I want to make a DIY overhead stirrer, to stir a glass of 5 Litres of pure water to bewtween 100-2000 rpm using a common impeller. I want to use a brushless DC motor (BLDC) to drive the impeller. ...
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