LM2907 shift lamp problems

[stuzomuzo]

what sim software?

this is the reference design.

hi im trying to replicate this circuit i have tried livewire and multisim 9 and 10 but it does not have the LM2907 chip. any ideas on what software the guy used?

thanks

 

[stuzomuzo]

HI there. I'm new to this forum, came across it through a search from google.

Anyways.. I'm building this shift lamp, which design is based on the LM2907's reference design but goes to a LM741 comparator.

Problem here is, the reference design is for a 8 cylinder engine.

my car is a steady 'ol 4 cyl. Now, i'm not sure if that's really the point.

For example at 1000rpm i should be getting 1v output. however... there seems to have been a mixup and i get roughly a tenth of the original voltage, roughly about 0.10 - 0.11v.
same goes all the way up to 6000rpm.

Now, based on the reference diagram, i've come to the conclusion that i'd probably need to change a resistor or two to compensate for the differences in application. but... i can't figure out which one.

enclosed is the design i'm following. i'm at wits end now...

sorry i meant this attatchment... so any ideas on what simulation software the guy used as multisim does not have the LM2907