[mythtv-users] IR Transmitter Components, Need these double checked- Urgent!

Adrian Burden aburden at onegeeksopinion.com
Sat May 24 11:31:07 EDT 2003


Here are the part numbers I used.

1000UF 25V Capacitor, I also used a 3300 10V and it worked fine too.
NPN 2N3904
PNP 2N4403
1N4148 for all the Transistors.

Cheers...


-----Original Message-----
From: mythtv-users-bounces at snowman.net
[mailto:mythtv-users-bounces at snowman.net] On Behalf Of Chris Germano
Sent: Friday, May 23, 2003 4:30 PM
To: mythtv-users at snowman.net
Subject: [mythtv-users] IR Transmitter Components, Need these double
checked- Urgent!


I just went out and bought a bunch of components to build an IR receiver
and 
transmitter for my pvr. Here are a couple questions, that I really need
some 
info on:

For the lirc.org schmatic for a the 'improved' transmitter 
(http://www.lirc.org/improved_transmitter.html),

-The transistors mentioned on that schematic are NPN & PNP, now what
kind of 
transistors are they? I bought the generic "Switching Transistors" and
the 
larger transistors that have that heat sink which are for power
amplifying 
since the docs say low-medium powered transistors, but that could mean
both. 
So would it be the normal transistors 
(http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fna
me=CTLG%5F010%5F005%5F004%5F001&product%5Fid=276%2D1617) 
or the powered 
one(http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5
Fname=CTLG%5F010%5F005%5F004%5F005&product%5Fid=276%2D2020)?

-As far as the diodes go on the same circuit, the docs mention "silicone

only" not germanium, and so I have a pack of "Switching Diodes 1N914
1N4148" 
- Silicon #246-1122, as well as some "iN4003 Micronmini Silicon Diodes 
#276-1102". Any idea which one I should use for all those diodes on the 
schematic?

-1/2 watt resistors should be fine correct, I don't need 1/4 watt
(shouldnt 
make a diff anyway am I right?)

-The schematic states it needs a 4000uF capacitor, would something
around 
that uF work? Also does it matter if they are polarized or not?

Sorry for all the questions, the author of that schematic sure assumes a

lot, and I don't want to open all my components and put it together to
find 
out it doesnt work.

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