D Kimak Posted February 25, 2010 Report Share Posted February 25, 2010 Does anyone have data on the demo board from Natl Semi's LM3914, it has Pads along one edge, for mounting a few external components, but all 10 green led's are already mounted on board, and the IC is the type under a drop of epoxy, I have the IC's data, but no data on the small demo board Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 26, 2010 Report Share Posted February 26, 2010 I have some NSM3915 modules that are about 46 years old. The LEDs are dim and are red.Here are photos and the layout showing the pins: Quote Link to comment Share on other sites More sharing options...
Alex Tsekenis Posted February 27, 2010 Report Share Posted February 27, 2010 Is this a multilayer board audioguru? What is the purpose of those features that look like vias?This IC packaging technique reminded me of those old grey Tetris handheld games with a little bump between the buttons and screen. Their ASIC was packed in the same way. Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 27, 2010 Report Share Posted February 27, 2010 The small pcb is single-sided. I used the vias and some edge contacts to dimmly light all LEDs then the signal caused them to get brighter. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.