A 12V *AC* power supply

[Udi Finkelstein]

Since you mentioned you bought a USB based Logic analyzer, I thought I'd
mention the open-source approach.
I was searching for years for a low-cost Logic Analyzer until I found this
(i.e. something I can pay for a hobby without feeling I'm wasting too much
money).

The Open Logic Sniffer is a fully open source Logic analyzer, with up to
~100MHz sample rate, and up to 32 bit inputs.
It is USB based, and has full source code for everything from the
schematics, PCB layout, PIC firmware and the VHDL source code for the Xilinx
FPGA (Spartan 3E 250), and the multiple clients available.
The cost is ~$45 including shipping to Israel here:
http://www.seeedstudio.com/depot/bus-pirate-v3-assembled-p-609.html?cPath=61_68

http://dangerousprototypes.com/open-logic-sniffer/
http://www.gadgetfactory.net/gf/project/butterflylogic/

Another companion product is the Bus Pirate, a low speed, low cost USB based
tool for hacking serial buses (I2C, SPI, JTAG, etc.). It can also be used to
program AVR, PIC microcontrollers. Like the Open Logic sniffer, the Bus
Pirate is also full open source.
The Bus pirate is an essential tool in case you manage to erase the PIC
bootloader on the Open Logic sniffer.

This one costs ~$27 also from Seeed:
http://www.seeedstudio.com/depot/preorder-open-workbench-logic-sniffer-p-612.html?cPath=75

http://dangerousprototypes.com/docs/Bus_Pirate

Generally speaking, SeeedStudio combines the open source spirit with the low
manufacturing costs at china, low price margins, and very low airmail
shipping costs.

Udi

2010/7/13 Shachar Shemesh <shachar at shemesh.biz>

>  Hi list,
>
> I bought a USB connected logic analyzer for too much money (not that much).
> When buying, I did a mistake and not thought through the issues, and bought
> from a US supplier without telling them this needs to be a 220V country. As
> a result, I got an external power supply that is 110V, which outputs 12V AC
> at 1000mA (why they do not write "1A", I do not know).
>
> To my shame, I actually bought a universal DC supply without noticing that
> it's AC I need, and started a support call with the company. They were very
> nice, and when we, finally, found out the source (I hope it is it), the guy
> said I could probably get by with 18VDC, but it would strain the capacitors
> (my math suggests that 15VDC is closer to the mark).
>
> So, does anyone know where I can get a 12V AC power supply? They are not
> exactly a commodity.
>
> Thanks,
> Shachar
>
> --
> Shachar Shemesh
> Lingnu Open Source Consulting Ltd.http://www.lingnu.com
>
>
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