Author Topic: what have you bought lately that's cheap & cool?  (Read 21311 times)

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Offline Bruce Abbott

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Re: what have you bought lately that's cheap & cool?
« Reply #75 on: December 05, 2015, 06:45:25 pm »
So you power them with 5V and they only output 3.5V!?  :-DD
NMOS logic outputs have passive pullups made from N channel FETs, which increase resistance as the voltage approaches Vcc.  TTL logic high is >=2.0V. The Z80 doesn't have to pull its outputs up to +5V, so it doesn't!


 
 

Offline obiwanjacobi

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Re: what have you bought lately that's cheap & cool?
« Reply #76 on: January 07, 2016, 08:01:44 am »
I bought some adapter PCBs: http://www.ebay.com/itm/151916828644

But it seems the solder mask on the 0.5mm pitch side has come loose. The 0.8mm pitch side seems ok.
You have been warned.
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Offline diyaudio

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Re: what have you bought lately that's cheap & cool?
« Reply #77 on: January 07, 2016, 08:42:05 am »
For some novel projects I just bought this.   :)
RGB LED Ring 24 Bit WS2812B 5050 RGB LED with Integrated Driver
http://www.ebay.com/itm/252222767754

Learning FPGA/CPLD material for 2016 I bought this.

Xilinx XC2C64A CPLD Core Module CoolRunner2 Mini Board
http://www.ebay.com/itm/280790348232

Xilinx Platform USB Download Cable Jtag Programmer for FPGA CPLD C-Mod XC2C64A
http://www.ebay.com/itm/181100412793

1PCS NEW EPM240 Altera MAX II CPLD Development Board
http://www.ebay.com/itm/272086159418

1PCS Altera CycloneII EP2C5T144 FPGA Mini Development Board
http://www.ebay.com/itm/27208617165




 

Offline ea_man

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Re: what have you bought lately that's cheap & cool?
« Reply #78 on: January 08, 2016, 01:37:25 am »
I got this cheap "desktop PSU", now I can drive LEDs with current and voltage. Super small and cute:
- http://www.aliexpress.com/item/B3603-Precision-CNC-DC-DC-Constant-Voltage-Constant-Current-Buck-LED-Driver-Module-Solar-Charging-Power/1625052409.html
You can use an old laptop PSU with it or something new like:
- http://it.aliexpress.com/item/Free-Shipping-Hot-Sale-12V-1A-12W-Switch-Power-Supply-Driver-for-LED-Strip-Light-Display/2013711623.html?ws_ab_test=searchweb201556_1_71_72_73_74_75,searchweb0_0,searchweb201560_9&adminSeq=220698018&shopNumber=1352056
- http://it.aliexpress.com/item/Newest-AC-100V-240V-to-DC-24V-2A-48W-Voltage-Transformer-Switch-Power-Supply-for-Led/32338467464.html?ws_ab_test=searchweb201556_1,searchweb201644_3_10001_10002_10005_10006_10003_10004_62,searchweb201560_8,searchweb1451318400_6149

For uC boards:
- Linux embedded: http://www.aliexpress.com/store/product/Orange-Pi-PC-set-1-Orange-Pi-PC-USB-to-DC-4-0MM-1-7MM-power/1553371_32451459094.html + http://www.aliexpress.com/item/100-Real-Capacity-SD-Card-32GB-Memory-Card-16GB-8GB-4GB-SDXC-Transflash-Flash-Memory-Card/32345588868.html
- Maple mini, NodeMcu, MSP432, PSOC
- AVR: http://www.aliexpress.com/item/Free-shipping-10PCS-ATTINY2313A-SU-ATTINY2313A-ATTINY2313-TINY2313A-2313-ATMEL-SOP-20/32452377502.html + http://www.aliexpress.com/item/Hot-Sale-10PCS-SOP20-SSOP20-TSSOP20-to-DIP20-PCB-SMD-DIP-Adapter-Plate-Pitch-0-65/32510968213.html
- Some OP amp fun: http://www.aliexpress.com/item/Free-Shipping-10-pcs-DIP-IC-8pins-UA741CN-UA741CP-UA741-OP-Amp-LM741-741-TI-Original/2038452759.html


-  USB Power  Current Test, just to see what my Arduino is doing when I'm in the lab with my laptop: http://www.aliexpress.com/item/1pc-New-Hot-USB-Charger-Doctor-Mobile-Battery-Tester-Power-Detector-Voltage-Current-Meter-free-shipping/32547414253.html
- ULN2803 to drive some stuff: http://www.aliexpress.com/item/10pcs-ULN2803-ULN2803A-ULN2803APG-2803-DIP18-NEW-ORIGINAL-SHORT-LEADTIME/925460404.html


- OMG slow RGB LED are beautiful on my depron RC airplanes: http://www.aliexpress.com/item/100-pcs-5mm-Fast-RGB-Flash-Red-Green-Blue-Rainbow-Multi-Color-light-emitting-diode-Round/32327291593.html (not diffused)
- These RXs for RC stuff are very cheap and light for the prototype toys: http://www.lemon-rx.com/shop/index.php?route=product/product&path=59&product_id=95

Lab:
- USB 2.0 Cable Adapter Rear Panel: these are cheap and good if you want to connect some more gadgets directly to the PC, :
http://www.aliexpress.com/item/Motherboard-USB-2-0-Cable-Adapter-Rear-Panel-Bracket-CLSL/1968886164.html
- This lamp with clamp comes useful when you're working with something big or you just need a lateral light with no cables involved: http://www.aliexpress.com/item/Flexible-USB-Battery-Power-Clip-on-LED-Table-Desk-Lamp-Light-28-LED-Bedside-Book-Reading/32327203814.html
-  These headphones have very good reviews but actually I don't like them so much, YMMV: http://www.aliexpress.com/item/KZ-ED2-enthusiast-bass-ear-headphones-copper-forging-7MM-shocking-anti-noise-microphone-sound-quality/2046242550.html

BTW: I'm a shopping addict :P
I also have a list of these things for students / labs, not in English sorry:
- http://lab.piffa.net/accessori.html
- http://lab.piffa.net/lista.html
 

Online bitseeker

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Re: what have you bought lately that's cheap & cool?
« Reply #79 on: January 08, 2016, 06:20:17 pm »
That's quite a list, ea_man, but definitely neat stuff in there. I may have to get me some as well. :)
I TEA.
 

Offline MickM

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Re: what have you bought lately that's cheap & cool?
« Reply #80 on: January 09, 2016, 03:09:28 am »
Hi, I had to check, thought it was a typo - 20MHz Z80.

Sure enough they were real.
I think the fastest that I had were 2 or 4Mhz.
So "back in the day", how much was a 20MHz 80?

I presume white ceramic with a gold top.
 

Offline obiwanjacobi

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Re: what have you bought lately that's cheap & cool?
« Reply #81 on: January 09, 2016, 07:32:06 am »
They didn't have a 20MHz Z80 "back in the day". Highest I can remember is 8MHz.
Arduino Template Library | Zalt Z80 Computer
Wrong code should not compile!
 

Offline mikerj

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Re: what have you bought lately that's cheap & cool?
« Reply #82 on: January 09, 2016, 12:27:58 pm »
For some novel projects I just bought this.   :)
RGB LED Ring 24 Bit WS2812B 5050 RGB LED with Integrated Driver
http://www.ebay.com/itm/252222767754

Looks like the seller missed a 'd' out of their user name "deainthebox" :)
 

Offline Kerns_jw

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Re: what have you bought lately that's cheap & cool?
« Reply #83 on: January 10, 2016, 10:07:26 pm »
Just bought another rpi 2 and accessories to get one of my 3d printers up on octoprint. Still thinking of upgrading that printer to 24v too, but haven't decided what route to go.
 

Offline Macbeth

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Re: what have you bought lately that's cheap & cool?
« Reply #84 on: January 10, 2016, 11:06:15 pm »
I bought some adapter PCBs: http://www.ebay.com/itm/151916828644

But it seems the solder mask on the 0.5mm pitch side has come loose. The 0.8mm pitch side seems ok.
You have been warned.
That's why I would normally look at these things and buy in a larger qty - the uncut boards of 20x for example. (Though they do break them up to fit in China post mail limits). Less middlemen in the chain.

Even if you only went to buy 5 you could have http://www.ebay.com/itm/151916828936 spent a few piddling cents extra and had some stock (and possible decent 0.5mm pitch boards) too.

I am an utter tightwad though.  :-DD
 

Offline legacy

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Re: what have you bought lately that's cheap & cool?
« Reply #85 on: January 11, 2016, 02:16:27 pm »


this board, which comes with a debug unit  :D :D :D
 

Offline diyaudio

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Re: what have you bought lately that's cheap & cool?
« Reply #86 on: January 11, 2016, 02:45:16 pm »
For some novel projects I just bought this.   :)
RGB LED Ring 24 Bit WS2812B 5050 RGB LED with Integrated Driver
http://www.ebay.com/itm/252222767754

Looks like the seller missed a 'd' out of their user name "deainthebox" :)

nice catch.  :o
 

Offline obiwanjacobi

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Re: what have you bought lately that's cheap & cool?
« Reply #87 on: March 02, 2016, 10:58:54 am »
Arduino Template Library | Zalt Z80 Computer
Wrong code should not compile!
 


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