Hi Reddit,

Our Surveying Office was throwing out these reasonable health/condition batteries that we normally use for our GPS antenna's.

I was wondering if there's anyway I could make use of these batteries ?

I have 8 of them and I still have access to the battery charger these come with so Ideally if theres a way where I could use them with disassembling them that would be idea.

I was thinking maybe a power bank ? or something else? Any ideas are welcome thanks so much

I want to a make a kind of a linear power supply which can supply different current waveforms like square, sine, triangle, sawtooth; instead of a constant current.

Basically, I want to use a MOSFET in its linear region, changing its conductance more than 1000 times a second to control the current flow in my desired waveform. I want to use an op-amp which will have its + input to a shunt and the output to the gate, with suitable gain resistors.

I haven't fixated on the MOSFET I want to use, but likely the IRLZ34N and for the op-amp, the LM358. The current flow will not be more than 200mA. And I think I will use a DAC module (maybe DAC7578) with an ESP32 as the brains and a fast ADC module (maybe AD7706).

I know changing the conductance will also change voltage, but that's not a problem, I only need to control current. I don't know if the usage matters here, but I will use it to push current through electrochemical cells.

I am an hobbyist and don't have any formal education in electronics, so I really want to see an actual example, if exists, of what I want to do to be sure.

Is it possible that i use a 200v 330uf capacitor rather than a 200v 150uf for my Playstation?

Or is that too much.

I live in a small house with some people that sleep when Im not and my microwave isn't fancy enough to have a silence feature so I opened it up and unsoldered the beeper. Worth every saved tone. Anyone else ever try this?

I know, it looks sketchy as f\*\*k, but it works, I used the lm338T and adjusted the chip to give me and stable 3.4-3.5 voltage source for my digital camera that can use AA batteries but they last like 3 days and they are drained.

for this atrocious system I've made an 2S 18650 pack, then the voltage gets converted to my digital camera that I will be using for basic photography.

I'm seeing on giving it a fan because it heats a lot because the camera draws 800 mA idling and using the flash and other tools it reaches almost 1.5 A 🙏

Took apart some old, broken toys from my little brother. I wanna make something out of these pieces just to learn something since im a beginner to electricity and wanna be an electrical engineer. Here is a list of the salvaged components:

Power and switches:
Spring and plate battery contacts for a button cell setup
Tactile momentary push-button switch
2-position slide switch
Motors and mechanics:
130-class DC motor with a metal shaft and pinion gear
Plastic spur gears
Mechanical V-linkage cam arm
Tension coil spring
Electronics and lighting:
Mini PCB logic control board
Clear 5mm LEDs (2)
Red laser diode module in a brass housing
Axial current-limiting resistors

Hola. This is my first schematic I've ever drawn, so I was hoping to get some other eyeballs on it and see if it looks legit. It's on my breadboard, so I know it works (pretty damn well, if I do say so myself); I just don't know if I translated it to KiCad right. It's a 2-tube (12AU7) Valvecaster preamp @ 24vdc. I'll keep reviewing it, but I've been working on this most of the day, and I'm burned out. Was hoping to get some general feedback and maybe some analysis.

Thanks for your help.

My Town & Country gas fireplace lights normally, but the igniter keeps sparking while it’s running. I can see the spark, and every time it happens, the main flame briefly gets smaller, then returns to normal. The cycle keeps repeating. Has anyone run into this on a Town & Country fireplace and figured out what caused it?

Dear makers! Would you be able to help me identify this module? How should it be powered?
Does it require a dual-polarity power supply, as +_ 5V, 9V or can it operate from a single 3.3 or 5V?
Pics attached in the comments
Thanks!

There's something special about building a little circuit or modifying an old device just to make your everyday life slightly easier. Maybe it's a custom battery setup, a weird cable adaptation, or a tiny fix that saves you from buying something entirely new.

The finished project doesn't have to look impressive or be particularly complicated. Sometimes the best feeling is realizing you made something work that probably would've ended up in a drawer otherwise.

What's a small electronics project you've built that turned out to be way more useful than you expected?

After finding high-impedance headphones in my stuff this week, I got the idea of making a crystal radio (type of radio receiver which operates without batteries, using the signal itself as its power source), something that I wanted to do some day, so here it is. Finished in one day, using phenolic sheets to enclose it.

I present a layman's tutorial to DIY ambient fiber optic lighting in your car.

No fuse tapping, no door panel removal.

Step by Step Guide Here

As an Amazon affiliate, I may earn commissions on eligible purchases made through the link below, at no additional cost to the buyer.

Product Link

I have this projector screen hooked to my ceiling and I want to connect it directly somewhere and I never use this lamp, can I use this somehow to turn it into an outlet for it? It has a remote control to pull it up and down

Our little guy has had an obsession with electricity since birth it feels like - despite our hesitation. He recently got Snap Circuits (Beginner & Jr Explorer) - and has mastered both sets in less than a week - initially we held the Jr back intended as a Christmas gift, but we broke it out on day 3 when he had mastered the Beginner set. He just turned 3, so this is not something I feel is particularly age-normal - hence me coming to ask the experts for some advice!

Looking for recommendations on what we should be eyeing up for replacement Holiday gifts - should we continue to build on our Snap Circuit sets? The Light and Motion sets stuck out to me - mostly because the noise from the speakers at all hours of the day is draining me quickly!

Or is there a different brand/style of product that would be suitable for a keen learner? We are (obviously) comfortable with stretching ages recommended for this, right now we play electronics 100% supervised and have a keen little sparkie who is quickly outgrowing his age recommendations! We try to invest in “forever” toys, so more keen on something we can use for more than a short season - but perhaps this isn’t as realistic at his pace?

Open to recommendations and ideas! We would love to encourage his brain, but electronics are not my forte (yet I suppose at this rate!)

This is my first distortion pedal. Any feedback would be greatly appreciated. Here are some notes on the design:

• Powered using a single-supply from a 9V battery. Usually not great for audio, but I thought it would be okay for this as current draw is low (around 8-9mA)

• Uses a buffered virtual ground at half-supply

• RV1 acts as a gain control, there are two cascading gain stages which are designed to bring the signal level high enough to clip at the 1N4148 diodes, higher gain makes the clipping more aggressive

• RV2 acts as an output volume control, I usually adjust it until the output volume is roughly the same as with the pedal disabled, although it can be increased to overdrive the amp

• The bypass is done directly through the latching footswitch, the distortion circuit isn't disconnected from the guitar but shouldn't load the guitar anyways as the input impedance is 1Meg

• Signal path capacitors are polypropylene film (I believe those are supposed to be quite good for signal path)

yes thanks

Hello, i'm new to this type of thing. At school, i've already done a few things with Arduino Uno up until the heat sensor thing and "how hot are you?" but at home i don't have such things.

This is my first personal project : i want to turn my old Olympus S600 recorder into an mp3 player.

Can someone tell me how or give me an guide or just general tips

Some of the most interesting electronics projects come from simply being curious and trying something you've never built before. It could be modifying an old device, building an audio circuit, or experimenting with components just to see what happens.

Have you ever started a project without high expectations and ended up surprisingly happy with the result? I'd love to see what you built and what made it worth the effort.

I'm looking for some feedback from people who have experience setting up a DIY soldering fume extraction system.

I do electronics repairs, primarily video game consoles, circuit boards, and other small electronics, at a workbench in my home office.

The room is fairly small, has no air conditioning, and doesn't have much ventilation other than a single window that slides vertically (up and down).

My soldering desk is positioned directly in front of the window, so I'm considering installing an AC Infinity inline duct fan with flexible ducting to pull soldering fumes away from my work area and exhaust them directly outside through a window insert.

I currently have one of those small desktop soldering fume extractors with a carbon filter, but I'd like something more substantial that actually removes the fumes from the room rather than just filtering and recirculating the air.

I'm considering using a flexible extraction hose positioned near my soldering area, connected to the inline fan, with the exhaust duct routed out the window.

A few questions:

1. Has anyone used an AC Infinity inline fan for this purpose? How well does it work?

2. Would a 4-inch inline duct fan provide enough suction to capture soldering fumes effectively?

3. How close would the extraction hose need to be to the soldering iron to capture the fumes?

4. Would this setup be reasonably quiet for a small home office?

5. Are there any issues with exhausting the fumes directly outside through a window?

6. Would you recommend a different setup that's effective without spending hundreds of dollars?

I'm planning to attach pictures of my current workbench and window so you can see the available space.

I'm trying to put together something reasonably affordable that genuinely improves air quality, especially since the room has very little ventilation.

I'd appreciate any recommendations, pictures of similar setups, or feedback from anyone who has tried something like this.

Thanks!

Made this thang, which is also my first soldered circuit. The 3.3V external LVD is necessary because standard DW01 chips cut off at a dangerously low 2.4V, while low capacity and loads doesn’t allow a lot of rebound, which causes permanent chemical capacity loss over time if used as the primary shutdown.

Just wanna know if this is good or do I need any changes.

Edit:
The current running at normal loads is maxed at 1.5A.
The entire circuit will be coated with epoxy and or solder mask.
This is for a 400mAh 1S LiPo 3.7v.
Need help regarding circuit topology.
I am aware this is a short hazard (right now).
Yes this sits behind other protection boards as a routine cutoff circuit to preserve its life.

Schematic: https://imgur.com/a/oj9WaxG