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Questions tagged [diy]

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

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4
votes
2answers
69 views

Building a phone charger 500 years ago

Imagine a theoretical scenario where I am transported backawards in time 500 years with nothing but a mobile phone containing all of human knowledge. Clearly I want access to this valuable resource ...
-1
votes
0answers
41 views

Carbon tracking on coil

I built this circuit using a relatively small two wire ignition coil. https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ When I ran the circuit, no spark occurred meaning ...
2
votes
1answer
109 views

How did static charge ruin my control board?

We have a Thermia geothermal heat pump that was working fine up until we had a particularly bad thunderstorm. Lightning took out the power for a while and burned up a DSL modem, a router, and a IP ...
1
vote
0answers
46 views

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 ...
4
votes
5answers
149 views

DIY generator. Simple and small

I have read many posts on this site and everyone seems very competent, so here I am... very new to this. I'm trying to learn how to convert a motor into a generator. I'm just getting a bit overwhelmed ...
1
vote
1answer
95 views

SMD transistor die vs DIP transistor die [closed]

Is the die of SMD transistors different from die of DIP transistors with a unique part number? Is the power transmission of a transistor dependent on its package type or chip type ?
1
vote
0answers
54 views

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. ...
0
votes
0answers
38 views

Mountain Bike Light Bar 18650 battery pack

I have a 6 Inch LED Spot Mini Bar Light which is used for vehicles, it uses 12-24 V and is rated at 18 W of power. I have some 18650 batteries which would work perfectly for this project. What would ...
0
votes
1answer
40 views

What happens if you only energize one pole in a 2-pole 240 V circuit?

I have an Intermatic pool timer box that has two 120 V poles. The LINE has two pins (Pin 1 = L1, Pin 3 = L2), and the LOAD side has two pins (Pin 2 = Load 1, Pin 4 = Load 2). Currently, I have ...
0
votes
1answer
92 views

How to measure the output impedance of a valve preamp?

I was trying to measure the output impedance of a DIY preamp for the past couple of days without any luck. Each time, I got to the same result of around 3K3 ohm, which is unbelievably low. This is ...
0
votes
1answer
60 views

Correct type of wire for simple DIY projects involving soldering [closed]

I am making my own bluetooth speaker which will require me soldering wire to PCBs etc. However, I am unsure of which type of wire to buy for the project. I understand that positive and negative wiring ...
0
votes
1answer
94 views

Identify these components for bluetooth speaker [closed]

I am wanting to make my own DIY bluetooth speaker (first time electronics project) and I have found several good Youtube videos on the topic. However when it comes to finding the actual parts, I am ...
0
votes
1answer
126 views

How to buy electronic components for little projects? [closed]

I have some projects in mind, some of them under development, and I want to design PCBs for them with little SMD components. So I have been choosing some of the ones I need in websites like Digikey or ...
0
votes
1answer
74 views

FR 5311M Programmable servo? [closed]

I bought this odd servo motor called the FR 5311M from FeeTech, which is advertised as a programmable servo motor which can switch from position to continuous rotation by flashing it with FeeTech's FR ...
5
votes
5answers
4k views

How to get 20 V from a USB-C charger?

I want to power my DIY stuff with a MacBook Pro USB C charger. The label on a charger says that it can provide three different power profiles: 20.2V - 4.3A 9V - 3A 5.2V - 2.4A There is a ton of ...
1
vote
3answers
922 views

DIY 5V power supply from phone charger

I want to power 25 adafruit NeoPixel LEDs. According to the specs they draw a maximum of 60mA at 5V each. In total that would be 1,5A at 5V. I would like to use a 2A usb phone charger as a power ...
6
votes
6answers
3k views

Techniques for building 'Bed of Nails' testing board

When testing a complete circuit board a 'Bed of Nails' can significantly reduce time and errors. What are some techniques for making a DIY Bed of Nails? ...
0
votes
1answer
446 views

2D DIY capacitive panel

I'm planning on replacing lights with smart bulbs (e.g. Yeelight RGBW) and replacing light switches with capacitive panels connected to Arduinos which will send data to RPi, which will then control ...
0
votes
2answers
1k views

Replicate PCB design on stripboard

I'm thinking about making a DIY project (this one). I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was ...
0
votes
2answers
109 views

Getting circuit input on a computer

(Modified repost from stackoverflow since it might be more suited to this site) I wanted to try building an arcade stick starting as simple as possible(ICs and basic electronic components as opposed ...
-1
votes
1answer
184 views

DIY battery from scratch. Is it possible? [closed]

Batteries are expensive. I want to be able to store about 30 kW worth, but even the cheapest kinds of batteries, like Lead-acid, or Salt Water batteries are too much. I've looked into reviving dead ...
0
votes
2answers
2k views

Is there any formula to get number of windings for a 50W voice coil of a speaker?

Is there any formula to calculate number of windings to get a 50 Watts voice coil of a speaker? let's say, I want to wind a 20mm diameter voice coil for a speaker. And my coil is made out of copper ...
0
votes
2answers
1k views

How to Make DB9 F/F serial RS232 mini gender changer?

I want to connect My "USB to RS232(Male end)" to my NanoVolt Meter having RS232 male port. To make both communicate i need to make DB9 F/F serial RS232 mini gender changer. Any Circuit or suggestion ...
0
votes
1answer
5k views

series charging three 18650 batteries with three chargers off the same 5V supply [duplicate]

being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from an old laptop battery. I want to make a balanced 3S charger with ...
-1
votes
1answer
151 views

DIY TDA2822N computer microphone

I am using the following circuit to make a computer microphone. The "speaker" component is the computer's microphone input. The problem with this circuit is that somehow I can hear capacitors ...
1
vote
1answer
314 views

Meanwell vs generic power supply [closed]

I am currently planning out a custom 3D printer build which will run on a 24V 600W power supply. I have specked out for a $90 MeanWell supply from eBay, but I've noticed similar generic power for ...
0
votes
1answer
143 views

Building homemade low inductance capacitor

i am trying to build a low inductance capacitor. I could just buy a doorknob capacitor but i don't wanna pay that much. So i know that you need a dielectric, i am using overhead transparency sheets. ...
0
votes
1answer
139 views

Which end is host in a USB-C to USB-C charging/power cable?

I have two different kinds of DIY USB-C connectors...one kind that is rigged to be a "host" USB-C connector (pulled-up with a 56k resistor per spec), and the other is rigged to be a "device" USB-C ...
1
vote
1answer
321 views

Flashing light circuit

Problem: I have built a wooden model of a lighthouse. I want to make the light in the house flash. I am can use a soldering iron. I have no circuit experience. Question: How can I build a simple ...
0
votes
1answer
165 views

Hard drive won't power on, is this the reason why? [closed]

I have a somewhat old, but functional (used to be, actually) hard drive, model Samsung HD103SJ, which I use for backup purposes. This means this is not a fixed unit. Since a few weeks ago when I ...
-1
votes
1answer
65 views

Creating a linear actuator

so I am working on a project that involves opening and closing a two piece chamber made of rubber. I have to get a good seal on the chamber so no gases can pass through between the rubber pieces and ...
1
vote
0answers
190 views

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/ [...
2
votes
1answer
330 views

What causes failure in longer USB cables?

I wired up some USB-C 2.0 to USB-A 2.0 cables, and tested the maximum length I could get out of them when connecting a PC (host, USB-A) to an external hard drive (device, USB-C). I got stable power ...
0
votes
2answers
437 views

Microphone PCB Questions [closed]

I've been working on a project to build a microphone in DIY after finishing my audio engineering internship, but it seems like my knowledge in electronic isn't good enough to fully understand what i'm ...
2
votes
2answers
4k views

Problems trying to wire a USB-C cable

I have been trying to figure out how to custom wire a USB-C to USB-A cable for a while, with no luck.I have tried some different connectors, but wanted to get some outside ideas on what I might be ...
3
votes
3answers
1k views

What are an amateur's options to put a high-end IC on a board? [closed]

I'm actually an experimental physicist who does software-development for a living. So my knowledge basically stops at writing micro-controller programs and putting them on a breadboard, and hooking ...
0
votes
2answers
473 views

Female mono jack connector 6.3mm

I'm building a DIY pedal effect for my electric guitar and I have to connect the input and output jack connector, but I don't know how to do it. The connectors have 3 pins, one is the tip which it is ...
0
votes
1answer
99 views

Powering 4 12V 0.45Amp fans off USB?

This question actually has a few parts. Basically I have 4 12V 0.45 A computer fans,which I want to use in a DIY cooling pad project I'm currently working on. I know that as per the standard USB 2.0 ...
0
votes
0answers
408 views

Has Anyone Ever Gotten a Delta DPS-400AB-5 A PSU to Work Standalone?

I got my hands on a Delta Hot-Swap Server Power Supply that's capable of 400W or 33A on the 12v rail. I've been tinkering with it for a few hours now and can't seem to find what pins are for the Pson ...
0
votes
1answer
681 views

Analog current and voltage adjustable power supply design

I saw this circuit on some recommended YouTube channel and I thought it would be a good start to building a custom PSU, learning some stuff along the way. I would like to keep the circuit analog for ...
3
votes
1answer
21k views

Diy 18650 4s battery pack [How to charge, how to build?]

I'm building a bluetooth portable speaker. However, I have some questions about building my first 18650 battery pack. I have 4 pcs of Panasonic unprotected NCR18650B 18650 3.7V 3400mAh. My goal is to ...
-3
votes
1answer
2k views

DIY a j-link debugger

I want to replicate THIS jlink debugger according to my own needs. But I can't find it's schematics and firmware anywhere. Is illegal to replicate it or distribute it's source? If no, then where can'...
2
votes
4answers
2k views

UV solder mask sticking to cover instead of PCB

I'm doing the usual DIY PCB process. Lately I got some of the chinese UV solder mask (similar to the one used in this video). I can work with it just fine - it sets under my UV lamp perfectly, within ...
1
vote
2answers
622 views

Custom/DIY Metal-Core PCB?

I would like to fabricate a slight enhancement over the metal-core PCB's shown here: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6071 Specifically, my application requires 2 LED's of ...
-1
votes
1answer
2k views

DIY 4*18650 Batteries charger with TP4056 paralel problem with how to balance it

days ago I did this project like the pic which is a DIY for 4*18650 OR 6*18650 (NOW I MADE 4 AND LET`S STICK TO IT) Sony vtc5a charger 3.7 v with new tp4056 with protection (copied from one youtube ...
0
votes
1answer
70 views

Game Show Button DIY help

The club I am a part of at my school is currently trying to host a variety/dating show in which contestants will have the capability of controlling a button. There should be about 12 buttons to make ...
2
votes
1answer
549 views

Metal enclosure for custom car stereo project

I'm thinking about developing a custom car stereo, and it surprised me that there's no DIY enclosures for this purpose. I've just found plastic boxes in the 1 DIN size which can be installed into an ...
0
votes
0answers
28 views

Common rectifier (or source) to power testing equipments

I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
0
votes
2answers
126 views

How do I properly calculate the requirements for an on/off switch?

I'm building an arc lighter to learn more about electronics and I'm not certain how to calculate what I need given the components I have. Do I go off the rating for the battery or the combination of ...
1
vote
1answer
100 views

Connecting a switch to a jack

Firstly i want to mention that I am not even close to an engineer or i have absolutely no experience with electronics. Here is my case. I have an old laptop with broken power button. It is not just ...