car RPM meter 2

ido2 · 10th September 2007, 02:49 PM

Hello,

There's this post from Cobra' :
http://www.diyaudio.com/forums/showt...616#post737616

However I couldn't find the schematics for it, could anyone please help with that ?

Thanks in advance,

Ido

Ron E · 10th September 2007, 10:59 PM

possibly?

http://www.national.com/ds.cgi/LM/LM2907.pdf

ido2 · 11th September 2007, 08:36 AM

Thank you for your quick reply.

I have gone through that manual, however I am new to electronics, and Since that schematics over there differs from others I have found on the net, it just gets me confused on how to wire the tach..

I'm currently building by this schematics:
http://www.rollmeover.com/bronco_fab..._schematic.jpg
but will use only one 3914..

hope it works well.

Also, the person at the electronics store gave me a 2907N instead of a 2917, he said it should also work.
By the datasheet, the difference is a builtin diode. would it also work for me ?

10th September 2007, 02:49 PM	#1
ido2 diyAudio Member Join Date: Sep 2007	car RPM meter 2 Hello, There's this post from Cobra' : http://www.diyaudio.com/forums/showt...616#post737616 However I couldn't find the schematics for it, could anyone please help with that ? Thanks in advance, Ido

10th September 2007, 10:59 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	possibly? http://www.national.com/ds.cgi/LM/LM2907.pdf __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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11th September 2007, 08:36 AM	#3
ido2 diyAudio Member Join Date: Sep 2007	Thank you for your quick reply. I have gone through that manual, however I am new to electronics, and Since that schematics over there differs from others I have found on the net, it just gets me confused on how to wire the tach.. I'm currently building by this schematics: http://www.rollmeover.com/bronco_fab..._schematic.jpg but will use only one 3914.. hope it works well. Also, the person at the electronics store gave me a 2907N instead of a 2917, he said it should also work. By the datasheet, the difference is a builtin diode. would it also work for me ?

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