LED S-Meter Schematic

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kb3ejv
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LED S-Meter Schematic

Post by kb3ejv » Wed Nov 19, 2008 9:57 am

Looking for a schematic for a LED S-meter. Would like to have one to replace a no working needle type of s meter.

Bigglez
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Re: LED S-Meter Schematic

Post by Bigglez » Wed Nov 19, 2008 10:24 am

kb3ejv wrote:Looking for a schematic for a LED S-meter. Would like to have one to replace a no working needle type of s meter.
Would that be a bar graph or a digital readout (like a clock)?

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Edd
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Post by Edd » Wed Nov 19, 2008 12:53 pm

<html>
BAMMMMMMMM. . . . . .!!!

KB3ejv. . . . . .meet. . . . . N6ZAV

Considering a Bar indicator being satisfactory and that you REALLY don't need a digital. . . .S9 + .1596. . . .readout,
( me. . . . I don't like bobbling digits) .

A 40 Segment LED Bar S-Meter (or less ...if you scale down some decades, but, what the heck, why not go for it. . .the WHOLE enchilada !

Info Location:

http://www.qsl.net/n6bg/thunt/ledsmtr.html

73's de Edd :grin: :razz: :grin:
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Bigglez
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Post by Bigglez » Wed Nov 19, 2008 1:49 pm

Edd wrote:A 40 Segment LED Bar S-Meter (or less ...if you scale down some decades, but, what the heck, why not go for it.
That's not an S-Meter as defined by the
IARU, it's a blinky lights box.

Here's the required S-Meter response:

Code: Select all

S-reading    EMF (μV 50Ω)  dBm    dB above 1uV  
S9+10dB      160.0         -63     44 
S9            50.2         -73     34 
S8            25.1         -79     28 
S7            12.6         -85     22 
S6             6.3         -91     16 
S5             3.2         -97     10 
S4             1.6         -103     4 
S3             0.8         -109    -2 
S2             0.4         -115    -8 
S1             0.2         -121    -14 
For calibrated LED bar or dot display use the
LM3916-1 ASSP IC for a VU meter (i.e. 3dB/step log
response). Both the LM3914 and LM3916 were
made obsolete some years ago.

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dacflyer
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Post by dacflyer » Wed Nov 19, 2008 2:43 pm

Hey! EDD :D what ? no more quipps at the ends of your post..what gives, i miss them...lol

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Edd
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Post by Edd » Wed Nov 19, 2008 3:15 pm

Right-0. . . . on the persons erroneous selection of the sole I.C. required . . . . he could only have been MORE in coincidence with the eventual result that you suggested, should he have opted on using a
LP3943 in the application.

http://www.national.com/pf/LP/LP3943.html


73's de Edd :grin: :razz: :grin:
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Whut you talkin' 'bout, Willis. . . .er. . .FlacDyer
Repeat. . . .
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Bigglez
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Post by Bigglez » Wed Nov 19, 2008 6:54 pm

Edd wrote: Right-0. . . . on the persons erroneous selection of the sole I.C.
If the author's intention was a string of blinky lights,
that IC was a valid selection for 1997 (date on your
link). I merely pointed out that National had redone
the part with a different suffix as the original is now
obsolete.
Edd wrote: he could only have been MORE in coincidence with the eventual result that you suggested, should he have opted on using a
LP3943 in the application.
Yes, I'm aware of National's LED flasher IC offering,
but I took the OP's request to be a serious question.
BTW, some of your fonts appear to be of different sizes,
are you shouting at us?

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