[help] trying to build a light system

[STINGERX]

hi,
as you can see from here:

Pspice shows me this errors in the simulation:

**** INCLUDING SCHEMATIC1.net ****
* source sys
V_V1         N00149 0 5Vdc
R_R1         0 N00437  1k TC=0,0 
R_R2         0 N00783  1k TC=0,0 
R_R3         0 N01174  1k TC=0,0 
R_R4         0 N01530  1k TC=0,0 
R_R5         0 N01942  1k TC=0,0 
R_R6         N00149 0  1k TC=0,0 

**** RESUMING sys.cir ****
.END

ERROR -- Less than 2 connections at node N00437
ERROR -- Less than 2 connections at node N00783
ERROR -- Less than 2 connections at node N01174
ERROR -- Less than 2 connections at node N01530
ERROR -- Less than 2 connections at node N01942

am i doing this the wrong way?
i'm trying to design this so the voltage in each junction will be even

any suggestions?

 

[kam1787]

What is the Vd of the LEDS? Are all the LEDs the same?

I am puzzled when you say you want the voltage 'even' at each junction. Is it the same voltage or same brightness?

You should NOT wire LEDs in parallel [unless they are 'perfectly' matched] else one will hog the current and burn out.


>>>IF<<< the Vd is from 1V6 to 2V0 you can wire two in series, and place a resistor to limit the current for each set of two
else you will need a resistor for each LED.

 

[bigdogguru]

Besides the points made by kam1787, if you take a closer look at the schematic, essentially you have a 5v power supply (V1) powering a 1kΩ resistor (R6), the rest of the circuit is irrelevant due to the bridge connection (short) marked by the red X in the attached schematic.

This bridge connection (short) is also the reason for the SPICE errors.



BigDog

 

[betwixt]

...the Worlds most complicated 5mA constant current load - without indicator lights!

Brian.

 

[bigdogguru]

...the Worlds most complicated 5mA constant current load - without indicator lights!

My thoughts exactly! :lol:

BigDog

 

[kam1787]

What happened to the op????????????

 

[betwixt]

... can't find his computer in the dark because the lights don't work :lol:

Brian.