RESn circuit

Newzed

Is there any reason I can't use a 2N2222A in place of the 2N3904 in the RESn circuit?· Minimum quantity on the 3904 from Digikey is 600 - not RoHS compliant, I would guess.

Sid

Mike Cook

I don't see why not, however www.mouser.com looks to have plenty of the 2N3904 in stock, and they don't have a minimum order dollar amount like www.digikey.com

http://www.mouser.com/index.cfm?handler=displayproduct&lstdispproductid=271833&e_categoryid=241&e_pcodeid=51127


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Mike

Newzed

Thanks, Mike.· If I ordered the 3904 from Mouser I would have to pay the $5.00 minimum plus shipping since that is the only thing I need, and that would make it a pretty expensive transistor.· I'll go with the 2222A since I have them on hand.

Sid

Mike Cook

Sid,

www.mouser.com does not have a minimum order charge of $5.00

I can think of no reason why a 2N2222 would not work in place of the 2N3904.

I would use what I had on hand.

Have fun and good luck.

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Mike

Newzed

Mike, I have designed my own board for the Propeller.· It is sort of like the PropStick, except it has an On-Off switch, a 5VDC and a 3.3VDC regulator in tandem, and an RCA connector for the TV object, plus an 8-pos 5VDC bus,an 8-pos Gnd bus, and a pushbutton that can be patched to any pin.· The PB is pulled high by the on-board circuitry.

Sid

Mike Cook

Sid,

I'm doing something similar using ExpressPCB, I have 4 Propeller DIPs that need a permanent home!

My board will have the following:

1. 3.3 and 5 VDC switching power supply

2. the discrete programmer, something like this:

http://forums.parallax.com/showthread.php?p=585009

3. EEPROM, TV-IO, and IR detector on pins P31-P24

4. P0-P23 will go to a general purpose header

When I get done testing all the GPS receivers & antennas I purchased, I'll get back on the ExpressPCB board.

I'm planning to replace some of my 'one-off' prototype work that I've been doing on: PIC, SX, and AVR with the Propeller.

Hopefully all former processors that I've been using will be replaced with the Propeller. Only hitch in this scheme is the occasions when a $.50 PIC micro is all that's needed for the final design.




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Mike

Forrest

FYI www.glitchbuster.com/ sells a bag of (12) 2N3904 transistors for $.98 + $1.95 shipping

rockin_rick

Newzed said...
Minimum quantity on the 3904 from Digikey is 600 - not RoHS compliant, I would guess.


Sid

How bout this one:

www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=34204&Row=90782&Site=US

2N3904FS-ND - ~186,000 in stock - RoHS not specified - TO-92 - min qty = 1

Rick

Newzed

Thanks, Rick - I finally found it after I had sent me order ibn.· Knew I'd seen it once before but I was using the wrong part number.· Oh, well.............

Sid