IDX-PRO+VDI

[seadoggy]

what is best replacment for LM 2930??,bee cuz i cant find in my country!!

[onuba]

merindo only hear a small cloc to the speaker, another pcb, this has many errors

[onuba]

speaker how many watts does it have
?

[reiv]

I have a simple question concerning VDI, how to correctly set up "THRESHOLD" at VDI options? It is always have to be at max "10" or it depends on something?

[onuba]

aid ... Q4 BD139in this circuit MPSA13 no

[kabier]

hi don above is the alu. shield after winding the coil the foil is folded over the coil and pressed by foam and white glue.

[kabier]

[onuba]

this circuit is correct speaker and d3

this circuit is correct speaker and d3

[kabier]

[kabier]

hi don am surrey 22 awg is ok get confused with American gauge.

[dfbowers]

hi dfbowers i used .7 for tx and followed yr nice way using foam and white glue and have a resistance of 1.6 ohm. i used alu. foil for shield
surrey unable to post pictures.

.7 mm looks to be between 21 and 22 AWG depending on insulaton but I think a bit thicker than 22 AWG. If you can find a way to share pics or video of your coil I would like to see it.

BTW. I am just about finished a 10" concentric for IDX using similar wire and construction methods. It is working very well on the workbench. I need to form a pair of shells yet but will post up some pics soon.
don

[kabier]

hi dfbowers i used .7 for tx and followed yr nice way using foam and white glue and have a resistance of 1.6 ohm. i used alu. foil for shield
surrey unable to post pictures.

[dfbowers]

hi don for tx coil you used 22awg seems a low gauge and will give high resistance

Yes, this is true. I still get 15V PP across the coil though and works just fine with 22 Gauge.
Dropping wire size to 26 AWG will cause noticable drop in amplitude to about 12V PP.
Increasing wire gauge to 20 AWG does not increase amplitude but adds more bulk and weight, plus much harder to work with.

[kabier]

hi don for tx coil you used 22awg seems a low gauge and will give high resistance

[onuba]

If it's a Silverdog kit they will be labeled SP+ and SP-

kit is not Silverdog down photo and d3 is well