LM3916 VU meter circuit

[seroxatmad]

Hi

Looking at the attached pic can anyone advise for using the circuit in bar mode!

JB1,2,3,4 and JD1,2

Looking at the lm3916 pdf says connect pin 9 to +vcc for bar mode but what about JD1 and JD2?

Cheers

John

 

[jan.didden]

I think you asnwered your own question. JD1,2 connect pin 9 to Vcc or to the other connection to select DOT or BAR mode. Clearly, you want all four jumpers in the same position for a specific mode.

jd

 

[seroxatmad]

Hi

Thanks for the reply - I assumed i would jumper JB1,2,3 and 4 but wasnt sure about JD1 and 2.

Cheers

John

P.S We met at chesterfield UK at the diy meet.

 

[jan.didden]

[snip]P.S We met at chesterfield UK at the diy meet.

To darned long ago - you guys should throw another one!

jd

 

[seroxatmad]

I was thinking about having the bar/dot mode an option via a switch

Seems it may be a pain to figure out

John

 

[jan.didden]

I was thinking about having the bar/dot mode an option via a switch

Seems it may be a pain to figure out

John

Where's the pain? A DPDT switch?

jd

 

[seroxatmad]

Yes was thinking about a pcb mounted DPDT switch for JB1,2,3 and 4 but what about JD1 and 2?

Cheers

John

 

[jan.didden]

Yes was thinking about a pcb mounted DPDT switch for JB1,2,3 and 4 but what about JD1 and 2?

Cheers

John

OK for two channels you need a 4-pole switch, double throw. A bit less easy to find, yes.
Mouser gives 400 hits, like this one: PN42LESA02QE C&K Components Pushbutton Switches . $ 1.10 Or toggle types, hundreds.
http://nl.mouser.com/ProductDetail/...=sGAEpiMZZMvudeGI7i40XOzZDxmIb/GZekQAxW0k38g= $ 10

jd

 

[seroxatmad]

What about JD1 and 2 are they shorted when JB1,2,3 and 4 are?

Cheers

John

 

[jan.didden]

What about JD1 and 2 are they shorted when JB1,2,3 and 4 are?

Cheers

John

The 3916 data sheet should tell you which is connected to which in which mode.

jd

 

[Shaun]

The one thing that I did not like about the LM3196/5 is that the LEDs were not always hard on or off, but could appear to be fading on and off (i.e., those LEDs on the leading edge of the bar graph). I rather liked the fluorescent bar graph displays that were found in the Technics and Pioneer equipment of the time ('80s). Any options with regards to making the 3196 crcuit perform similarly?

 

[seroxatmad]

Well page 9 and 10 of the data sheet (fig 1 and 2) show pin 9 connected for dot mode but on page 8 states leave the mode select pin open circuit!

Cheers

John

 

[seroxatmad]

Thanks to a user on head-fi who suggested JB1,2,3 and 4 the B meaning BAR
mode and JD1 and 2 the D meaning DOT mode!

Simple using a little logic...

John