eBay Cheap: $0.75 Electronic Doorbell Kit NE555

A very cheap electronics kit bought on eBay for just 50p. It makes a nice two-tone sound. But there were a few hiccups along the way.

Perfect Doorbell Suite Electronic Production Doorbell Suite DIY Kit NE555 F5 http://www.ebay.com/itm/Perfect-Doorbell-Suite-Electronic-Production-Doorbell-Suite-DIY-Kit-NE555-F5-/111947302037


Leon Baždar says:

When you pressed the button for the first time and it didn’t work, I heard you beggining the f word but then you quickly stopped lol.

therob39 says:

I wished, you’d ring the door bell a few times more..

Nicnl says:

Awesome video as usual 🙂
But just an advise there
Be careful with that kind of video background
This one is very noisy and the video encoder struggle to process this without blurring everything and making artifacts
Unified mats like the green one is better suited for optimal video quality and lesser video file size

Ron Thompson says:

My speaker works weak ,I think I order some to have around,I could other door bell kits with case a separated button about 3.00$.

steubens7 says:

“let’s uh, put some water on that sponge”

alanmelb says:

I notice a wire off cut just near your torch when you power the doorbell up. This vanishes at 10.46
Was there possibly a similar piece of wire embedded in your cork board?

Andrew Dibbins says:

Hi Julian,

Can I recommend one of these for your soldering tip cleaning http://www.ebay.co.uk/itm/Sunny-Soldering-Iron-Tip-Cleaning-Wire-Scrubber-Cleaner-Ball-w-Metal-Case-/231888290924?hash=item35fd9e846c:g:e2UAAOSwxp9W-2Kr I have similar and they work great.


MyBigThing2010 says:

I wanna connect a PIR to the switch pads instead of the switch and see if it will do the door entry chime thing that some convenience stores have on the door as a notification that someone has entered the store…that would be sweat for $.88 n a spare PIR sensor

william fleete says:

That looks a lot like the “ding dong” doorbell kit from Dick Smith, the circuit is likely the same with some differences in component values and the board is completely different

Jerry Ericsson says:

I built that kit a few years back, thought I might add it to our motor home but after I saw it, I decided it really wouldn’t do. After a winter at an RV park, I discovered a doorbell would be a waste there anyhow, as most RVer’s simply walk in when they come to visit anyhow. Sometimes a bit shocking but most times a friendly high followed by a beer.

ElfNet Gaming says:

I like how it has a tac switch on the board instead of clamp jacks to connect it to an actual doorbell switch..


Wouldn’t it be easier just to buy a buzzer, and wire a push button momentary switch and and power brick from your junk box to it…?


You might not even need to buy the buzzer, if you have access to junk cars. Some older junk cars have a “ding dong” bell door alarm that keeps going when the door is open. It’s the first bloody thing I disable and pull the wire out of when I get a new car…

deltadelira says:

Sounds like a bifonic

Circuit Cellar says:

Cool videos. Would love to see you workspace on our blog if you’re interested. http://circuitcellar.com/workspaces/ We feature engineers’ and diyers’ workspaces.

Greg K says:

those sponges are horrible use steel wool there are ones for soldering they are much better and the water can ruin you iron tip

realflow100 says:

WHOA!! there was a cut at the beginning of the vid and i saw the sponge instantly enlarge in size! Freaky magic sponge!! I wonder what you went off to go do!

papalevies says:

Maybe a short that burned out

superdau says:

I am quite sure that they are using that by pressing the button you charge or discharge one of the caps which in turn keeps the 555 out of reset for a short time. Since, if I remember correctly, the needed reset pin voltage is fixed and not relative to the supply, running it at a higher voltage might make the 555 go into reset too quickly and not produce a sound.

I hope they have cap in series with the speaker. If not it could explain why the chip got so hot (driving the speaker continously with DC).

Rex Doran says:

Julian, Thanks for this video. I have decided to learn a little about electronics. After watching a previous video you did, I ordered two for 1.12 US$,  I received them in less than two weeks and could not believe that they were sent by air mail. How did you know which way to install the diodes?

vgamesx1 says:

13:04 *slightly satanic voice* Doorbell kit. Haha

mnelson10000 says:

Love the kit builds!! More! More! :p thanks for sharing

lets build stuff says:

Great video Julian, even had a left over diode by the looks of things 🙂

Priviledgy Shitlord says:

My guess is that the speaker is about 8 or even 4 ohms, so the increased voltage means that the timer chip has to pump a lot of current into such a low impedance load because it drives it directly. If you feed 6 volts it should not get as warm.

MyBigThing2010 says:

I had the same problems including the NOT working and the hot chip….then I stripped back the wire to get to the copper past the shitty tinning at the battery side and IMMEDIATELY I had perfect operation and no hot chip…even when actuating the piss out of it with a 9V…..I think it was the power being fed back somehow to the chip from the storage side because it wasn’t getting what it needed from the battery side with the bad/intermittent connection…maybe I’m WAY off but my chip isn’t even warm now and I get perfect operation every time I reconnect power…

Redwan Hasan says:

Is that purple or violet?

i u says:

very smooth soldering job out there (y)

Jon Whitton says:

75p of fun. Look forward to the simple circuit diagram. 555 always was a winner in the 80’s, remains a favourite to this day.

Knuckles the Echidna says:

Love watching your videos snuggled up in bed with my smartphone every night!

Alan Wolstenholme says:

are you a retired teacher?

GrandadIsAnOldMan says:

Great video Julian. I recently bought a selection of these types of kits off eBay with the intention of running a short series and was amused that most came without any instructions. I don’t think my videos will be a patch on yours and they certainly took me much longer to assemble that your experienced hands achieve. Your talk through is much more informative and professional than mine too. I run mine with about 4.5 volts or 3 or 4 AAAs

foundatlantis says:

press the button again!!

Dylan T says:

Use that patreon money for a nice iron.

Mark Harvey says:

Put one of these together with my daughter the other day. Great little kit. Funny I did the exact same thing and hooked up a 9 volt battery and smoked the 555 chip, lucky I had a spare. Its was much happier running on 5V supply, but possibly not as loud.

K7AGE says:

Julian, what camera gear are you using for your videos? Nice closeups and you are able to work around the camera. Very nice.

kolovrat says:

I bet that the two electrolytic caps are for the tones. Change the values and the timing of the tones will change.

reggiebacci says:

“103 – that’s ten nano-farads” – I salute your optimism mate.

Carey Turner says:

Please stop pressing that button!!! lol

David Sonshine says:

Thanks Julian – Looks like fun, I ordered one to assemble.

Blank says:

Any reason you don’t use aliexpress instead of eBay? Review system is much better and way easier to get refunds if the items don’t ship. Plus they have sort by newest added.

Kevin Day says:

Cool, I figured it out. The reset pin is normally held low through the lone resistor. Pressing the button shorts Vcc through a diode to the reset pin, charging the small cap. When the button is released, the cap slowly discharges through the resistor again, creating the timeout. Two of the three adjacent resistors are in series from Vcc to the discharge pin, but pressing the button effectively shorts one of them out through the other diode, giving a higher oscillation frequency until you release the button.

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