tacho transister

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screamer69
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tacho transister

Post by screamer69 »

been looking at the diagram for it so i can built the unit up but looking through my bits and bobs i havent got an 2n2222

is there any others i can use ???

i have a

mps2907
pn2222a

but looking trough my transister book the pn2222a is a replacment for the 2n2222a so it looks like this one will do the job

am i right ???

cheers
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
jsmcortina
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Post by jsmcortina »

Pretty much any old small signal npn transistor will do the job. So yes those should work.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
screamer69
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Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

jsmcortina wrote:Pretty much any old small signal npn transistor will do the job. So yes those should work.

James

cheers james

thats one problem solved !!
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
ptegler
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tacho transister

Post by ptegler »

Well personally I cheated when wiring in my tach ckt.
Since I'm running MSnS-E and wheel triggered wasted spark,
I used the original ckt (for the single ingition coil) to
drive my tach. I soldered a resistor to the back of the
board, fro mthe V+ trace to the collector of the xstr and
then just jumpered it's base t othe proper processor pin.

If I had thought about it before hand, I would have used
that heat sink mounted IBGT xstr as the PWM drive for the
IAC vavle!

ptegler




On Thu, 22 Jun 2006 07:33:54 -0700
"screamer69" <screamer69@ntlworld.com> wrote:
>
> jsmcortina wrote:
> Pretty much any old small signal npn transistor will do
>the job. So yes those should work.
>
> James
> (end of quote)
>
>
>
> cheers james
>
> thats one problem solved !!v3 board running extra 29k
>megatune 225 2.0 8v vauxhall turbo
> _________________________________________________________
> This post is at:
> http://www.msefi.com/viewtopic.php?p=127023#127023

Paul Tegler
ptegler@cablespeed.com
Posted by email.
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

just to check

it says 1k on the pic is this right resistor should be brown ,black red ???

im crap when it comes to getting these right ( should have stayed in school as a kid might have lernt something lol )
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
jsmcortina
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Post by jsmcortina »

screamer69 wrote:just to check

it says 1k on the pic is this right resistor should be brown ,black red ???
Yes that is right. Check out the MS assembly guide as Lance has some good info on resistor colour codes.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

cheers james :oops:
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

right the boards done im useing js0 for the output but as im not using stepper iac can i put js0 to iac2a to save on putting a plug on it as the m/s unit it taken out alot or will something go bang on me and the wireings already there for the iac unit but not used )

js10 is going to iac1b for the knockunit

many thanx
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
jsmcortina
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Post by jsmcortina »

Look at the traces from the DB37 to those IAC holes and you'll see that they don't go any further. They are safe to use.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

jsmcortina wrote:Look at the traces from the DB37 to those IAC holes and you'll see that they don't go any further. They are safe to use.

James

cheers i wasnt sure so i thought i would ask better toask than blow something up :shock:

i o u a pint if i ever meet you !!

thanx again james
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
screamer69
Experienced MS/Extra'er
Posts: 323
Joined: Mon Jul 25, 2005 3:20 pm
Location: peterborough ----uk------

Post by screamer69 »

all working as i should ! :lol: :lol: :lol: :lol:

thanx again
2.0 8v turbo 10.7 standing 1/4@136mph on m/s fastest mk2 astra 8vt in europe !!!
2.0 turbo tigra 10.1 standing 1/4 @ 145 mph with problems :( havent turned the boost up yet
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