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4hv.org :: Forums :: Electromagnetic Projectile Accelerators

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Battery Charge indicator

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LAN_403

Troy

Mon Oct 04 2010, 01:23AM

Registered Member #3194 Joined: Tue Sept 14 2010, 04:16AM
Location:
Posts: 13

So, apparently the simplest things ellude me...I've managed to build a HV power supply and IR sensors for a new coil gun project, BUT I'm driving myself crazy trying put together a simple battery charge indicator with an LM3916 and 10 segment LED bar graph display. I've looked through dozens of schematics and breadboarded it out about a dozen times but no dice. think I'm going wrong between pins 4 and 8.

Granted I the only pots i have are salvaged and have no clear markings and i'm not sure what do with the reference voltage that supposed to be on Pin 5 - does that come from the same positive voltage input that goes to pin 3 or from some other source?

Need help, please!

GhostNull

Mon Oct 04 2010, 09:15AM

Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291

A schematic would be helpful in this case and this thread is a bit off topic in this board, so make a post here:

and ask it to be moved to the general electronics board. You'll probably get more replies with it there too.

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