one_tunna_lova
Newbie level 1
tacho project
Ive been looking into building a led tacho for a car for some time using this circuit diagram:
http://www.t-r-j.com/Auto/Tach/tachometer.htm
Im sure it would work, but i really would like to see it working in multisim first. this is my first time using multisim.
I started building the circuit and you can see what ive done so far here:
http://img22.imageshack.us/my.php?image=forumd.png
however i was unable to find the lm2907 frequency to voltage converter in the component database. i did some googling and found out you can make your own components, and i found a spice model for the lm2907 here. i chopped out the part needed (from the .SUBCKT to firsts .ENDS line) and used it, however im unsure if the spice model i found is correct.
can someone confirm if that spice model is what im after?
im also unable to find a spice model for the other required component, the LM3914 LED Bar/Dot driver IC.
if someone could point out where i could find the spice, or how i go about making it that would be great! (i have the component datasheet)
also when i try to simulate what ive made so far, i get the following errors
how can they be resolved? (i assume they have something to do with the frequency to voltage converter)
Ive been looking into building a led tacho for a car for some time using this circuit diagram:
http://www.t-r-j.com/Auto/Tach/tachometer.htm
Im sure it would work, but i really would like to see it working in multisim first. this is my first time using multisim.
I started building the circuit and you can see what ive done so far here:
http://img22.imageshack.us/my.php?image=forumd.png
however i was unable to find the lm2907 frequency to voltage converter in the component database. i did some googling and found out you can make your own components, and i found a spice model for the lm2907 here. i chopped out the part needed (from the .SUBCKT to firsts .ENDS line) and used it, however im unsure if the spice model i found is correct.
can someone confirm if that spice model is what im after?
im also unable to find a spice model for the other required component, the LM3914 LED Bar/Dot driver IC.
if someone could point out where i could find the spice, or how i go about making it that would be great! (i have the component datasheet)
also when i try to simulate what ive made so far, i get the following errors
Code:
Too few parameters for subcircuit type lm2907__test__1 (instance: xxu1)
Error: unknown subckt: on line 115:xr3 5 5 gnd potentiometerr3
Error: unknown subckt: on line 138:xu4 vcc 6 gnd lm7806c__voltage_regulator__1
Error on line 115 in C:\DOCUME~1\DANIEL\LOCALS~1\TEMP\02.CIR.cir: xr3 5 5 gnd potentiometerr3
unknown device type - error
Error on line 138 in C:\DOCUME~1\DANIEL\LOCALS~1\TEMP\02.CIR.cir: xu4 vcc 6 gnd lm7806c__voltage_regulator__1
unknown device type - error
Instrument operation performed (2009, March 22, Sunday, 20:33:11)
| Instrument Analysis:Transient Analysis
| | Plot title:
| | Analysis settings
| | | Initial Conditions:Automatically generate initial conditions
| | | Starting time (TSTART):0
| | | Stop time (TSTOP):1e+030
| | | Plotting increment (TSTEP):automatically calculated (less than:1e+030)
| | | Maximum time step (TMAX):automatically calculated (less than:1e+030)
| | Perform consistency check
| | Variables from analysis
| | | Show device values at the end of the simulation
| | Representation as SPICE commands
| | | begin-scope page
| | | checknodes 3
| | | save all
| | | iplot all
| | | set trtol = 7
| | | set itl4 = 100
| | | set convlimit
| | | set rshunt = 1e+012
| | | -param hrange 0 1e+030
| | | save
| | | tran -env-options 1e-005 1e+030 0 1e-005 auto_ic auto_tstep auto_tmax
| | | if-error end-scope audit-log-show
| | | show all
| | | showmod all
| | | end-scope
| | Multisim Default Analysis Options
| | | Truncation error overestimation factor: 7
| | | Upper transient iteration limit: 100
| | | Enable convergence assistance for code models
| | | Shunt resistance from analog nodes to ground: 1e+012
| Output from instrument analysis
