VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

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VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Postby Joe Malone » Fri Apr 19, 2013 8:02 am




Available now on JLM web shop here

40 Led Meter displays PPM and VU ballistics with peak hold at the same time. Also can be switched to show CV gain reduction.

•40 x 1dB steps
•Shows PPM in red with peak hold.
•Shows VU in Green with peak hold.
•Balanced/Unbalanced input with front level adjustment.
•PCB 106mm(4.2") x 50.4mm(2")
•PCBs can be stacked 15mm apart with hex threaded spacers.
•Can be powered from +/-12vdc to +/-24vdc (less than 50mA total current draw all leds lit).
•Can have on board tiny 24vdc to 5vdc SMPS or +5v can be supplied externally.

Software version 1.0
SW jumper switched to 0v to switch to CV input for input on back terminals for Gain reduction.

Software version 2.0 COMING SOON
All features marked V2 will be new features in version 2.0 when released soon.

20 pin IDC header which can daisy chained to other 40 led PPM/VU/GR PCBs

1.Jumper for LED Brightness (Jumper GND Bright, 2.5v Dim, 5v Dimmer) V2.
2.Jumper for classic colour VU with PPM peak led V2.
3.Jumper for CV voltage change from 0v to 5v to 5v to 0v. (CV input must be driven by 1k to 2k series resistor to protect the PIC)
4.Jumper for direction change of meter right to left / Left to right
5.Jumper for turn off VU peak hold.
6.Peak LED Sync (do NOT fit jumper. wire used for meters to talk to each other via ribbon cable) V2.
7.Jumper for Peak hold lock with reset when jumper shorted. If jumper left on then defaults to peak hold with decay drop back.
8.Jumper for switching to CV input.
9.+5v
10.-/+V
(All jumpers can be switched or changed on the fly)(Jumper 1 is closest to the VU balance trim pot)
e.g You can switch direction and to CV input to have a Gain reduction meter that travels in the reverse direction to the VUPPM meter.

Image

VUPPM Assembly
The VUPPM has all parts values on the PCB overlay and is a normal build from the lowest to tallest height component.
Only component changes that need to be done depending on power supply voltages are listed in the table below. So usually best to work out these parts and fit them first. Also a good idea to fit all resistor to the PCB beofre soldering them to make sure you do not put one in the wrong place. For those not good with colour codes bend the legs of the resistor ready for the PCB and place them into a ohmmeter terminals (without any test leads) to check the resistor value before placing in the PCB.
The 4 Tri colour 10 LED Bars need to have the 10 legs bent down 90degree which can be done with a flat metal ruler etc so they all bend in a straight line. Top 2 legs need to be bent 60degrees so they will reach into the XG & XR pads. Best to only solder one of the bottom legs on each display until you have the 4 bars fitted in a straight line.
The 8 x BD139 transistors all face with their plastic side facing the JLM AUDIO logo end of the PCB. So do pin 1 of the TL074 and PIC CPU IC.
Diodes black or white stripes should line up with the thicker white stripe on the PCB overlay. All 1N914/1N4148 diodes stripes should be furthermost away from the LED displays and Zener diodes stripes if fitted should be closest to the LED Displays.

Any questions feel free to post here preferably or email me.

NEW VUPPMGR40v3 PCB Changes
Ver3 PCB can use +/-12v to +5v SMPS module or +5v to +/-12v module so meter can run on 5v plug pack.
Ver 3 PCB does NOT need to change value of R13 & R14 ever.
Image

Image

Have a stereo compact box and scale coming as well as a 1unit rack case scale. Looking for input on what other scale levels or types people are interested in like mono, 0DFS etc
Stereo compact box will have a optional pre made stereo D/A card for spdif and toslink inputs.

See scale examples below
Image
Scale panel size 128mm (5.039") x 45mm (1.772") and fits Hammond Enclosure 1598B.

Rack version below
Image
Scale panel size 128mm (5.039") x 38mm (1.496")

Photos of VUPPM Scale rack sample in 2mm clear perspex with black backing with laser cut text and bevelled edge.
Image
ImageImage

We use one of the PCBs against the front bezel with leds centred on the scale to drill the 4 holes in the bottom of the case.
Image

Then with 4 x 15mm to 20mm 3M bolts we position the bottom PCB with a 6mm plastic spacers with one lock washer below spacer and 2 lock washers above to make about a 7.5mm spacer.
Image

The 15mm bolts screw into the 15mm spacers. Then the second PCB is bolted with 6mm x 3M bolts to the 15mm spacers.
Image

Using VUPPMGR40 instead of analog VU meter in GSSL, LA2A, LA3A circuits.

The VUPPMGR40 can have its balanced input connected direct across the output of the LA2A or LA3A clones for VUPPM output level.
Use the circuits below to interface the Gain Reduction T4B to the CV input on the VUPPMGR40. Set jumper on VUPPM PCB for 5v to 0v CV input.
A switch between SW terminal and 0v on the VUPPM PCB with switch between VUPPM output level and Gain reduction.
May also want to switch the meter to reverse direction on Gain reduction by switching that jumper as well.

Image

The VUPPMGR40 can have its balanced input connected direct across the output of the GSSL for VUPPM output level.
Use the circuits below to interface the GSSL Meter output to the CV input on the VUPPMGR40. Set jumper on VUPPM PCB for 0v to 5v CV input.
A switch between SW terminal and 0v on the VUPPM PCB with switch between VUPPM output level and Gain reduction.
May also want to switch the meter to reverse direction on Gain reduction by switching that jumper as well.

Image
Joe :-)
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kante1603
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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby kante1603 » Sun Apr 21, 2013 3:07 am

Hello Joe,

hope you're fine.
You said we should put our questions here,so here we go:

1:Will the jumper for LED brightness work on linked modules meaning is it possible to put a 3-position switch on the frontpanel for linked modules?

2:Could you please explain the peak LED Sync a bit more in-depth (does this refer to Hold or Decay times)?

3:If I understand it correct one can run the unit from just +5Vdc ("Wallwart").May I ask for the estimated current when all LEDs are lit?

4:Talking about the upcoming stereo compact box,will the D/A "eat" other formats than SPDIF too (e.g. AES/EBU)?

5:Will there be a link or loop-through for the digital input to do a chain (e.g main or master A/D interface ---Meter---digital input on next device) or must we provide an extra (stereo-) digtal out for it?

I know,many questions,but I'm the first to ask here it seems,mea culpa :mrgreen:

Cheers,have a nice day,

Udo :wink:

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby Joe Malone » Sun Apr 21, 2013 9:43 am

kante1603 wrote:Hello Joe,

hope you're fine.
You said we should put our questions here,so here we go:

1:Will the jumper for LED brightness work on linked modules meaning is it possible to put a 3-position switch on the frontpanel for linked modules?

All meters connected by the same ribbon cable can share the one 3 position dim switch. 2.5v rail can be made with 2 x 1k resistors in series between the 0v and 5v rail. So a centre off toggle which short out either resistor will work.

2:Could you please explain the peak LED Sync a bit more in-depth (does this refer to Hold or Decay times)?

All meters set to slave follow the meter set to master. It just sync the peak leds stepping back down together. Using the sync pin on the ribbon cable.

3:If I understand it correct one can run the unit from just +5Vdc ("Wallwart").May I ask for the estimated current when all LEDs are lit?

Yes 5v regulated or 5v SMPS wall wart like used for iphones and ipads etc. Total current per meter fully lit is about 100 to 150mA @ 5v on full brightness with the 5v to +/12v SMPS on the PCB.

4:Talking about the upcoming stereo compact box,will the D/A "eat" other formats than SPDIF too (e.g. AES/EBU)?

Yes at the moment we have spdif in and out and toslink in. USB in which also powers the whole box.

5:Will there be a link or loop-through for the digital input to do a chain (e.g main or master A/D interface ---Meter---digital input on next device) or must we provide an extra (stereo-) digtal out for it?

Only loop with spdif to spdif or toslink to spdif at the moment.
Joe :-)

JLM Audio

Capturing Audio without Injury

kante1603
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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby kante1603 » Sun Apr 21, 2013 4:45 pm

Great,thank you for the infos Joe!

Best,

Udo.

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby ibanman555 » Fri May 24, 2013 6:12 am

Hello Joe,

Is there any way this meter can be integrated into a type of DAW controller?? I would really like to use these meters for my next build, but I am not sure if these are capable of this.

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby Joe Malone » Sun May 26, 2013 7:39 am

ibanman555 wrote:Hello Joe,

Is there any way this meter can be integrated into a type of DAW controller?? I would really like to use these meters for my next build, but I am not sure if these are capable of this.


I am not sure exactly what you mean by DAW controller? But we have built them into heaps of devices. The VUPPM meter usually takes analog audio in like normal VU and PPM meters do.

But we have used several cheap small adaptors to run the meters on spdif, toslink, Aes-ebu and usb to audio converters to make the meters run on any digital signal we have needed to interface with.

So if you DAW controller has analog , spdif, toslink, AES-EBU and USB audio in it then yes. But you would need to let me know more so I could show you how to interface the VUPPM meters to your needs.
Joe :-)

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby ibanman555 » Fri May 31, 2013 12:09 pm

Joe,

Thanks for your quick response!
Basically, this would be a digital mixer that controls specific faders, knobs and buttons in programs such as ProTools, Logic, Ableton etc. These are only controlled thru MIDI messages and there isn't actual audio passing from controller to computer. I am probably stepping way out of the bounds of what is capable here, but I LOVE your meters and would love to integrate them somehow. Here is a link to the project at hand...

http://www.ucapps.de/midibox_lc.html

and/or

http://www.ucapps.de/midibox_ng.html (new version)

you can see some pdfs/schematics how the signal is programmed and the existing LED meters are hooked up.

There are options to connect CV outputs (http://www.midibox.org/dokuwiki/aout_ng), and I see your meters have CV inputs. This sparked my interest that there is a possibility to program the meter outputs of my audio workstation to your meters via CV... just a thought.

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby Joe Malone » Mon Jun 03, 2013 9:48 pm

ibanman555 wrote:Joe,

Thanks for your quick response!
Basically, this would be a digital mixer that controls specific faders, knobs and buttons in programs such as ProTools, Logic, Ableton etc. These are only controlled thru MIDI messages and there isn't actual audio passing from controller to computer. I am probably stepping way out of the bounds of what is capable here, but I LOVE your meters and would love to integrate them somehow. Here is a link to the project at hand...

http://www.ucapps.de/midibox_lc.html

and/or

http://www.ucapps.de/midibox_ng.html (new version)

you can see some pdfs/schematics how the signal is programmed and the existing LED meters are hooked up.

There are options to connect CV outputs (http://www.midibox.org/dokuwiki/aout_ng), and I see your meters have CV inputs. This sparked my interest that there is a possibility to program the meter outputs of my audio workstation to your meters via CV... just a thought.


THE CV is for using the meter to show compression in a audio compressor. You would need to send Stereo Audio or AES/EBU or SPDIF ro USB audio to make the meters work in your box.
Joe :-)

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby bounav » Wed Jul 03, 2013 4:51 am

Hello,

Just finished assembling two 40 Led PPM/VU Meter kits into one Hammond case (1598BBK) with one of your VUPPM scale plate. It looks awesome and performs beautifully. I love of smooth the metering looks. Many thanks for putting this kit together!

I'm wondering how to best calibrate the kit (I'll be using the PPM and Vu meter mainly on the master out of my DAW when mixing projects).

What I did so far was fire up Logic and its Test Oscillator plugin, set to generate a 1KHz sine at 0dB with all the faders at 0dB. My understanding is that it a +4dBm signal (0dB vu) should then leave my sound interface.
Using the input trim (RV1) I set the red LEDs so that they just starts to light the last LED on the bank (+18 on the VUPPM scale), then using the balance trim (RV2) I set the green LEDs to just hit the "0" mark.

NB: I'm using the bottom of the scale (-21 dB to +18 dB).

Am I calibrating the PPM/VU meter correctly? I'm too sure about where to trim the peaks signal to.
Benjamin

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby Joe Malone » Thu Jul 04, 2013 8:11 am

bounav wrote:Hello,

Just finished assembling two 40 Led PPM/VU Meter kits into one Hammond case (1598BBK) with one of your VUPPM scale plate. It looks awesome and performs beautifully. I love of smooth the metering looks. Many thanks for putting this kit together!


Cool please feel free to add any photos of your kit build to here or facebook or instagram with tag of jlmaudio for other to see :D 8)

I'm wondering how to best calibrate the kit (I'll be using the PPM and Vu meter mainly on the master out of my DAW when mixing projects).

What I did so far was fire up Logic and its Test Oscillator plugin, set to generate a 1KHz sine at 0dB with all the faders at 0dB. My understanding is that it a +4dBm signal (0dB vu) should then leave my sound interface.
Using the input trim (RV1) I set the red LEDs so that they just starts to light the last LED on the bank (+18 on the VUPPM scale), then using the balance trim (RV2) I set the green LEDs to just hit the "0" mark.

NB: I'm using the bottom of the scale (-21 dB to +18 dB).

Am I calibrating the PPM/VU meter correctly? I'm too sure about where to trim the peaks signal to.


TO Cal PPM to VU put in a 1kHz tone and turn up the input level trim RV1 pot until the 40th red led just turns on. Then turn up the VUPPM RV2 until the 40th green led just turns on. Now VU and PPM are calibrated to each other.

The scale for the VUPPM has K14 & K18 scales on each side each meter. If you set 0VU = +4dBM on the K14 then the max 40th led will be +18dBM. If you set +4dBM on the K18 then max 40th led will be +22dBM.

Since it is a interface usually outputting a 1khz tone at full output without clipping and setting the input trim pot RV1 so the 40th led just lights will cal the VUPPM meter to your interface D/A out which usually clip somewhere between +18 to +22dBM.

Or if you are sure the interface outputs +4dBM with all faders flat then the way you have done the cal should be fine and can be checked by pushing the level up on the interface until it just about to clip and the 40th VUPPM led should just light.
Joe :-)

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby bounav » Tue Jul 09, 2013 8:28 am

Thanks for the calibration instructions Joe.

Cool please feel free to add any photos of your kit build to here or facebook or instagram with tag of jlmaudio for other to see


I wrote a short article about my stereo build of you kit on my blog: http://bounav.free.fr/wp/?p=361. The article contains a wiring diagram that details how to connect everything together. Hopefully some people will find it useful.
Benjamin

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREA

Postby Joe Malone » Tue Jul 16, 2013 1:59 pm

bounav wrote:Thanks for the calibration instructions Joe.

Cool please feel free to add any photos of your kit build to here or facebook or instagram with tag of jlmaudio for other to see


I wrote a short article about my stereo build of you kit on my blog: http://bounav.free.fr/wp/?p=361. The article contains a wiring diagram that details how to connect everything together. Hopefully some people will find it useful.


Wow Thanks Ben that is excellent :D 8) I will point some more links towards the article.

Thanks Again.
Joe :-)

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Postby DaveCawley » Fri Oct 28, 2016 2:50 am

Thanks to Joe for his recent help on this meter. Watch this space !

Dave
"Any sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clarke

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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Postby Joe Malone » Mon Oct 31, 2016 1:20 pm

DaveCawley wrote:Thanks to Joe for his recent help on this meter. Watch this space !

Dave


Cool let me know if you have any questions.
Joe :-)

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