LM3916 VU meter circuit - diyAudio
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Old 19th June 2010, 05:49 PM   #1
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Default LM3916 VU meter circuit

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
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Old 19th June 2010, 06:12 PM   #2
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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
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Old 19th June 2010, 06:55 PM   #3
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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.
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Old 19th June 2010, 09:39 PM   #4
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[snip]P.S We met at chesterfield UK at the diy meet.
To darned long ago - you guys should throw another one!

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Old 28th June 2010, 11:11 PM   #5
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I was thinking about having the bar/dot mode an option via a switch

Seems it may be a pain to figure out

John
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Old 29th June 2010, 01:30 AM   #6
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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
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Old 29th June 2010, 07:35 AM   #7
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Yes was thinking about a pcb mounted DPDT switch for JB1,2,3 and 4 but what about JD1 and 2?

Cheers

John
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Old 29th June 2010, 08:23 AM   #8
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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/N...ekQAxW0k38g%3d $ 10

jd
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Old 29th June 2010, 08:32 AM   #9
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What about JD1 and 2 are they shorted when JB1,2,3 and 4 are?

Cheers

John
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Old 29th June 2010, 08:41 AM   #10
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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
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