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Offline EEVblogTopic starter

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EEVblog #555 - 555 Timer Kit
« on: December 10, 2013, 09:57:00 pm »
Dave celebrates the classic 555 timer IC by building the Evil Mad Scientist "three fives" discrete timer kit.
Some scope measurements and an explanation of the internal 555 timer circuitry follow.
Construction: http://youtu.be/U6qZPx4uD0g?t=5m10s
Testing: http://youtu.be/U6qZPx4uD0g?t=34m35s
Circuit Description: http://youtu.be/U6qZPx4uD0g?t=38m16s
Waveforms: http://youtu.be/U6qZPx4uD0g?t=54m35s
Classic old Signetics 555 timer datasheet: http://serge.bertorello.free.fr/compsnts/ne555%20&%20ne556.pdf
The kit: http://shop.evilmadscientist.com/productsmenu/tinykitlist/652
Han's Book on Analog chip design: http://www.designinganalogchips.com/

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Offline ben_r_

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Re: EEVblog #555 - 555 Timer Kit
« Reply #1 on: December 10, 2013, 10:03:06 pm »
Ha, I forgot I wanted to buy one of these! Thanks for the reminder, just ordered one! $40 shipped.?
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Offline AG6QR

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Re: EEVblog #555 - 555 Timer Kit
« Reply #2 on: December 10, 2013, 11:30:46 pm »
Excellent choice for the 555th video!  I've wanted to get one of these kits, too.  Absolutely no practical reason for me to have it, but it's so cool.
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Offline Thor-Arne

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Re: EEVblog #555 - 555 Timer Kit
« Reply #3 on: December 10, 2013, 11:44:14 pm »
Nice kit.  :-+

I find it relaxing to watch the soldering videos, but it's more relaxing to solder myself.  ;)

On these videos a overlay with Dave's chattering face in the corner could IMO be an enhancement.  :P
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Offline Schwuuuuup

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Re: EEVblog #555 - 555 Timer Kit
« Reply #4 on: December 10, 2013, 11:54:44 pm »
Yes watching Dave solder is meditative as well... maybe I Loop it and use it as a screensaver ;-)

Also I learned so much about the 555 which I used before but didn't bother to understand it.

Another great Video!



By the way ... if a Name starts with SCH it's almost always German, and you pronounce it, like the C wasn't there... so my Nick name here should read shwooooop to you ;-)


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Offline c4757p

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Re: EEVblog #555 - 555 Timer Kit
« Reply #5 on: December 11, 2013, 12:02:52 am »
I'm torn between loving the black solder mask because it looks like a real chip, and hating it because invisible traces on a kit is kind of a rubbish idea IMO.

Too bad they couldn't silkscreen the circuit diagram over it.
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Offline skycarl

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Re: EEVblog #555 - 555 Timer Kit
« Reply #6 on: December 11, 2013, 01:09:35 am »
Great idea for the 555th vid. Good teaching on the chip as well.
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Offline deth502

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Re: EEVblog #555 - 555 Timer Kit
« Reply #7 on: December 11, 2013, 01:10:27 am »
now we are going to have to wait until the 7555th episode to learn about CMOS
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Offline timelessbeing

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Re: EEVblog #555 - 555 Timer Kit
« Reply #8 on: December 11, 2013, 01:14:32 am »
What size is the soldering iron tip you used in the video?
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Offline nathanpc

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Re: EEVblog #555 - 555 Timer Kit
« Reply #9 on: December 11, 2013, 01:34:18 am »
Awesome special video. By the way, I think current mirrors would be a awesome subject for a Fundamentals Friday. :)
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Offline juanfermed

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Re: EEVblog #555 - 555 Timer Kit
« Reply #10 on: December 11, 2013, 02:28:28 am »
Hi Dave, I join to Nathanpc: Fundamentals Friday on Current Mirrors :D. Great video on 555, thanks!
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Offline ashplant

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Re: EEVblog #555 - 555 Timer Kit
« Reply #11 on: December 11, 2013, 03:11:01 am »
Great video. And great subject.

I first encountered the 555 when I built a random number generator, decades ago, epochs ago. It pulsed at a few MHz into a super-simple counter. The counter went "1, 2, 3...  14, 15, 1, 2, 3...   ". But all you saw at the output was a blur, until you broke the connection between the timer and the counter. Then a number magically and randomly appeared.

The best part was building it. For the sake of debugging, I initially used a 33 mF timing cap. This meant that the 555 pulsed a about a Hertz. I watched the counter count up and reset. When I broke the connection the counter stopped.

Then I changed the value of a capacitor (something pF) and a deterministic system that did essentially nothing, became a random-like system that did magic.

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Offline Macbeth

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Re: EEVblog #555 - 555 Timer Kit
« Reply #12 on: December 11, 2013, 03:22:57 am »
Quote from: ashplant on December 11, 2013, 03:11:01 am
Great video. And great subject.

I first encountered the 555 when I built a random number generator, decades ago, epochs ago. It pulsed at a few MHz into a super-simple counter.

Surely not? The upper frequency limit is in the 100kHz range, maybe 300kHz or so with the later ones?

I am amazed that this IC (and the 741 op amp) are still classics and produced to this day!
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Offline Six_Shooter

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Re: EEVblog #555 - 555 Timer Kit
« Reply #13 on: December 11, 2013, 03:38:38 am »
Quote from: deth502 on December 11, 2013, 01:10:27 am
now we are going to have to wait until the 7555th episode to learn about CMOS

LOL!

There is some looking forward to the 1455th video for the TTL compatible version. ;)

I kinda wonder if Dave got a second 555 timer kit to make a 556 chip for the 556th video. lol
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Offline free_electron

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Re: EEVblog #555 - 555 Timer Kit
« Reply #14 on: December 11, 2013, 04:32:32 am »
on to video 741 ...
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Offline bandgap

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Re: EEVblog #555 - 555 Timer Kit
« Reply #15 on: December 11, 2013, 04:39:07 am »
Excellent video! I really like the little "doh" screw ups. Reminds us that you're human (as we all are!) :)

You convinced me to order a kit to use in my classes.  :-+

-Clayton
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Offline Stonent

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Re: EEVblog #555 - 555 Timer Kit
« Reply #16 on: December 11, 2013, 04:47:39 am »
Quote from: ben_r_ on December 10, 2013, 10:03:06 pm
Ha, I forgot I wanted to buy one of these! Thanks for the reminder, just ordered one! $40 shipped.?

I went the cheap route and spend about $2.00 on the transistors and resistors and ordered some tinned protoboard.  ;)
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Offline Stonent

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Re: EEVblog #555 - 555 Timer Kit
« Reply #17 on: December 11, 2013, 04:49:11 am »
Quote from: Six_Shooter on December 11, 2013, 03:38:38 am
Quote from: deth502 on December 11, 2013, 01:10:27 am
now we are going to have to wait until the 7555th episode to learn about CMOS

LOL!

There is some looking forward to the 1455th video for the TTL compatible version. ;)

I kinda wonder if Dave got a second 555 timer kit to make a 556 chip for the 556th video. lol

Video 595 is not that far, he can talk about shift registers. Maybe make one from scratch?
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Offline ben_r_

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Re: EEVblog #555 - 555 Timer Kit
« Reply #18 on: December 11, 2013, 05:06:09 am »
Quote from: Stonent on December 11, 2013, 04:47:39 am
Quote from: ben_r_ on December 10, 2013, 10:03:06 pm
Ha, I forgot I wanted to buy one of these! Thanks for the reminder, just ordered one! $40 shipped.?

I went the cheap route and spend about $2.00 on the transistors and resistors and ordered some tinned protoboard.  ;)
Ha yea that is the cheap route! I already have all the parts laying around as it was and I could have a circuit board made custom for myself for less as well. However I didnt buy it to use it for anything other than a conversation piece on my desk at work. I think its really cool looking and the fact that its functional makes it even better!
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Offline Six_Shooter

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Re: EEVblog #555 - 555 Timer Kit
« Reply #19 on: December 11, 2013, 05:12:43 am »
Quote from: free_electron on December 11, 2013, 04:32:32 am
on to video 741 ...

I was actually thinking of something similar and how we missed videos #339, #393 (and others) in that theme. lol
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Offline Stonent

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Re: EEVblog #555 - 555 Timer Kit
« Reply #20 on: December 11, 2013, 05:29:30 am »
Quote from: ben_r_ on December 11, 2013, 05:06:09 am
Quote from: Stonent on December 11, 2013, 04:47:39 am
Quote from: ben_r_ on December 10, 2013, 10:03:06 pm
Ha, I forgot I wanted to buy one of these! Thanks for the reminder, just ordered one! $40 shipped.?

I went the cheap route and spend about $2.00 on the transistors and resistors and ordered some tinned protoboard.  ;)
Ha yea that is the cheap route! I already have all the parts laying around as it was and I could have a circuit board made custom for myself for less as well. However I didnt buy it to use it for anything other than a conversation piece on my desk at work. I think its really cool looking and the fact that its functional makes it even better!

I am somewhat hoping someone makes another board from the schematic and releases it.

I noticed the terminal screws look almost exactly like VESA monitor mount thumb screws.
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Offline kaushleshchandel

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Re: EEVblog #555 - 555 Timer Kit
« Reply #21 on: December 11, 2013, 07:28:03 am »
I agree soldering is so relaxing... After a day of work, I go home and work on some projects; soldering. The soft metal melting, and that weak sizzling sound of flux is amazing..  :D
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Offline Six_Shooter

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Re: EEVblog #555 - 555 Timer Kit
« Reply #22 on: December 11, 2013, 07:55:39 am »
The more I work on my "robot" project that is due tomorrow using a Freescale Dragonfly board and Code Warrior, the more I am reminded that my favorite programming language is Solder. My Solder debugging tools show me errors that I can understand.

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Offline Goophy629

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Re: EEVblog #555 - 555 Timer Kit
« Reply #23 on: December 11, 2013, 10:03:44 am »
finally a tribally exiting assembly+soldering video  :-DD  damn I watched it all through....

Wondering if Dave has no fear of the leaded smoke...
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Offline EEVblogTopic starter

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Re: EEVblog #555 - 555 Timer Kit
« Reply #24 on: December 11, 2013, 10:09:34 am »
Quote from: Goophy629 on December 11, 2013, 10:03:44 am
Wondering if Dave has no fear of the leaded smoke...

There is no lead in the smoke, that's the rosin flux.
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