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Author Topic: Your latest purchase  (Read 112304 times)
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A 555 educational board, you can see the works!

And still not have a clue!  smiley-lol
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New power switch for older AC adapter

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Arduino Uno R3, Arduino Mega 2560 R3, Ethermega (R3), and some Ethernet Shields (R3), Chronodots, TMP36 sensors, DS18B20 sensors, LCDs/TFTs, RS232C to learn and play...

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Voltage reference box from eBay:



Supplies 2.5, 5.0, 7.5 and 10V from internal battery. Comes with calibration "certificate".
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http://www.gammon.com.au/electronics

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Very nice - love the  laser-cut box and it really looks the modern-day part to the old laboratory boxen - but I don't think I could justify the price for the infrequent times I would use it and the battery would run flat for the same reason, which is not good for Li-Polys as I understand.

Given that most digital multimeters have ranges based on "2", it seems only the 10V output is really useful.  (OK, I suppose you use the 2.5V for calibrating Arduinos, eh?)  I note its integral power converter.

Thus provoked, I could consider building one with a different reference and calibrating it from someone's reference - as that one is in the descriptions.  Of course you can say it's not worth the trouble - just buy it!

Interestingly - your photo shows 5 mm LEDs and I thought the pictures on eBay showed SMD.
« Last Edit: November 16, 2013, 07:31:40 am by Paul__B » Logged

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Good point, it's not identical to the one in the photo on the page I bought it. And I must admit I wondered about the power jack, now I see it is for recharging. Assuming they designed it with low consumption in mind that battery should last a long time.

You have to hold down the only button for a few seconds to "start" it, after which a brief click changes the output level.

I don't know how you know if it needs charging, all the documentation I received is visible in the photo.
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I don't know about "much more" complicated.

http://en.wikipedia.org/wiki/555_timer_IC

Quote
Depending on the manufacturer, the standard 555 package includes 25 transistors, 2 diodes and 15 resistors ...

This kit has 26 transistors, no diodes and 16 resistors. So about the same complexity.

http://shop.evilmadscientist.com/productsmenu/tinykitlist/652-555kit

Datasheet available at that link.
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I don't know about "much more" complicated.

http://en.wikipedia.org/wiki/555_timer_IC

Quote
Depending on the manufacturer, the standard 555 package includes 25 transistors, 2 diodes and 15 resistors ...

This kit has 26 transistors, no diodes and 16 resistors. So about the same complexity.

http://shop.evilmadscientist.com/productsmenu/tinykitlist/652-555kit

Datasheet available at that link.

Hmmm...  Thirty cents or thirty dollars... smiley-eek-blue

Still, it looks kinda fun.
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Peoples Republic of Cantabrigia
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I was very naughty and finally bought a standalone oscilloscope, the Owen SDS7102 for $365 with a free case over at Saelig. Still looking for a reasonably-priced signal generator whose output frequencies do not have to exceed 60Hz. All the stuff they have there is either way over spec or not standalone.
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Still looking for a reasonably-priced signal generator whose output frequencies do not have to exceed 60Hz
You can buy AD9850-based devices for about $5 each, with roughly 10mHz resolution up to 40MHz.
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it is not a signal generator,
I'm sorry - you're saying a sinusoid isn't a signal?
Did you mean to say it isn't a function generator?
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Some miscillanious relays for my rocket launcher controller. You've heard of it. Cmon. Goto errors and the lot...:333
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Mr and Mrs Crossroads' book... I'm still a teen at heart. Local supplier hopes it's in next weeks consignment.

Another local supplier is waiting for some protoplastic, and I hope they'll remember I want some of it.
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Yes I got my copy a few days ago:



It is written by Bob and Kathleen Patterson (CrossRoads and wife).

Saying it is "for teens" is probably an understatement. There is a lot of reference material in this book, including stuff like how to read a datasheet, confronting installation problems, interrupts, watchdog timer, interpreting part numbers, choosing types for C programs, EEPROM, SPI, I2C, and quite a lot more.

There are example circuits, example code, and a lot of other detail.

Let me put it this way: a great number of questions you might have about designing circuits, and writing code, are explained in this book. And if you are unfamiliar with electronics fundamentals, a lot of that is covered as well.
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A glowing recommendation Nick. You should do all Crossroads PR - Nice critique  smiley-lol

Edit - Nick, you did such a good job that I just put my order in at fishpond.com.au. That's what I call global infiltration
« Last Edit: December 04, 2013, 02:42:09 am by Pedro147 » Logged


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Quote
Still looking for a reasonably-priced signal generator whose output frequencies do not have to exceed 60Hz
You can buy AD9850-based devices for about $5 each, with roughly 10mHz resolution up to 40MHz.

Thank you, AWOL for the suggestion. There is a plethora out there, next step will be finding one that can handle up to +/-10Vpp and so on. Some seem to offer on-board amplifiers for that. Thanks again.
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