Comments (5)
See http://evilmadscience.com/KitInstrux/peggy2.pdf
Original comment by [email protected]
on 7 Dec 2010 at 2:10
from clockthree.
Also, from 2N5401 data sheet it shows that they can only source 600 mA. Thus
the current starvation. Our LEDs can draw 90 mA each * 10 = 900 mA. That is
without over driving them. Maybe we should search out another transistor.
Original comment by [email protected]
on 7 Dec 2010 at 2:13
from clockthree.
Transistor polarity seems OK on the schematic, but is reversed on the PCB
layout. Here's what we can do :
1. Use the existing transistors we already ordered for ClockTWO boards.
2. Order out new transistors just for the ClockTWO boards. These seem a good
fit :
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ZTX953-ND
(Digi-Key Part Number ZTX953-ND )
3. For ClockTHREE, use these :
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KSH32CTFCT-ND
(Digi-Key Part Number KSH32CTFCT-ND )
I tried a TIP32C PNP (Digi-Key Part Number TIP32CTU-ND) on the first column,
and it seems to improve considerably. But, these are too big for ClockTWO board
(TO-220 package)
Original comment by [email protected]
on 7 Dec 2010 at 6:30
from clockthree.
Original comment by [email protected]
on 11 Dec 2010 at 1:38
- Changed title: HW: column transistors are backwards.
from clockthree.
Closed on TJS final review
Original comment by [email protected]
on 5 Jan 2011 at 12:41
- Changed state: Fixed
from clockthree.
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from clockthree.