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Tsop40 willem adapter
Posted: Thu Aug 19, 2010 2:06 pm
by darknezz19
Hey guys i tried to make one of
theseusing an old ide cable but am not sure where to tie the grounds to. Should they ground out on the willem card or pc chassis or somewhere else?
Posted: Thu Aug 19, 2010 2:53 pm
by Memblers
Connect it to the ground on the flash chip, labeled VSS in that schematic. Connect it to both VSS pins. A chassis ground might not be connected to electrical ground, but may be problematic even if it is (you don't want any voltage difference between it and the chip's ground, it's better to be closely coupled to 5V+ / VCC).
Posted: Thu Aug 19, 2010 3:44 pm
by darknezz19
So do something like
this Memblers? 30 and 29 tie together as well on it.
*Edit*
Would the 2k2 resistors translate to color code red red red or red red orange?
*Edit2*
At first the adapter was grounded to the pc chassis then willem card but of course neither worked. Could this have damaged the tsop?
Posted: Fri Aug 20, 2010 8:03 pm
by Memblers
Yeah, that's right.
Looking up resistor color code (I don't have it memorized since I mostly jumped into the surface-mount stuff) it is red, red, red for 2.2kOhm.
At first the adapter was grounded to the pc chassis then willem card but of course neither worked. Could this have damaged the tsop?
Seems possible, but I don't know how likely. I guess it could even depend on your house's wiring and stuff. Use a voltmeter to check the difference between the circuit's ground and chassis ground. Maybe any difference more than 0.75V would be bad for the chip.
If you were curious, chassis or earth ground (same thing, correct me if I'm wrong) is there to let current escape to ground, otherwise it becomes easier for the human body to become the escape route, heheh. At one point I found out there was a bad ground connection in my basement because I was getting shocked while soldering some NES boards, I getting zapped through the traces, on individual edge connector pins. It's like a really painful way to do an electrical test of a board, haha.
Posted: Sat Apr 09, 2011 10:04 am
by Peccost
Has someone actually tested this adapter yet??
Because I've send my .brd files to the PCB maker and still waiting for the test...
Peccost