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Topic: 8x8x8 multiplexed LED cube with an Arduino Mega 2560 (Read 41 times) previous topic - next topic

dc42

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

dc42


OK, I have figured it out :) As I wrote, one NDP6020P costs about 2.5$ at Farnell. The transport to Romania would be 5 Euro, regardless of what is in the package. So, assuming that I'd buy 15 pieces of NDP6020P (8 for the 8x8x8 cube, 5 for the 5x5x5 cube and 2 for spares), the total cost would be around 27E or 35$. That's more than the 1000 LEDs and about 33% of the total project cost :) I there's no other choice, I'll go for it, but if there's some more widely available, less expensive MOSFET, I'd prefer that :)


All the suitable but less expensive p-channel mosfets I found were in SMD packages - and they are MUCH less expensive. So I think your alternative is to download Eagle and design a pcb to hold a 74HC595 and eight SMD mosfets. Then get Itead to make 10 of them for $9.90. Add mosfets such as http://www.ebay.co.uk/itm/20PCS-AO3401-SOT-23-P-Channel-MOSFET-TRANSISTORS-/150653948679?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2313acd307.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

Hippynerd

I ordered some of these from thaishine.com
N
Manufacturer Part No: IRF3205

Specification
Mosfet Type N-channel
Current Rating 110A
Rds (On) 8m?
Voltage Rated 55V


P
Manufacturer Part No: IRF9540

Description
MOSFET
Transistor Type:MOSFET
Transistor Polarity:P Channel
Drain Source Voltage, Vds:-100V
Continuous Drain Current, Id:-23A
On Resistance, Rds(on):117mohm
Rds(on) Test Voltage, Vgs:-10V


They were under $1 each in packs of 10.

I also found these (below), after I had ordered the above fets.

Mosfet Type: P-channel
Current Rating: 2.6A
Rds (On): 40 mOhm
Voltage Rated: 12V
Package: SSOT-3

Mosfet Type: N-channel
Current Rating: 4A
Rds (On): 100 mOhm
Voltage Rated: 60V
Package: SOT-223

They are smaller package, but probably suitable for my 1 amp needs. they may be suitable for 1.3 amp, you have to check.

Im not sure which one I got it from, thaishine also sells through ebay.
www.thaishine.com
www.taydaelectronics.com

I am way behind on those cubes, and I havnt had a chance to use the parts, but I assume they will be good for cubes/multiplexing.

Hippynerd

#68
Dec 29, 2012, 06:35 pm Last Edit: Dec 29, 2012, 06:46 pm by Hippynerd Reason: 1
dc42, are those tiny sot23 parts going to be able to handle 1.28 amps? they seem pretty small for that. I looked, but I didnt see any datasheet.

Wow, 4 amps from such a tiny package. I wish I had gotten those now.

dc42

Yes, see http://www.aosmd.com/pdfs/datasheet/AO3401.pdf. They are rated at 4A continuous (although 3.7A would be a more realistic limit when driven from 5V, since that is the current at which Rds(on) is measured for Vgs=4.5V) and 1.4W power dissipation (although I wouldn't want to dissipate more than a few hundred mW in one).
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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