VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
Posted: 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 2.0
All features marked V2 are new features in latest version 2.0.
(The New 50Mhz PIC used for ver 2 software doesn't use the 20Mhz xtal or 2 x 15pF. So they can be fitted or not.)
20 pin IDC header which can daisy chained to other 40 led PPM/VU/GR PCBs
PIn 1,3,5,7,9,11,13,15 = 0v
Pin 2. Jumper1 for LED Brightness (Jumper GND Bright, 2.5v Dim, 5v Dimmer) V2.
Pin 4. Jumper2 for classic colour VU with PPM peak led V2.
Pin 6. Jumper3 for Classic colour mode 1 (K18 headroom) no jumper. Classic colour mode 2 (K14 headroom) jumper fitted V2
Pin 8. Jumper4 for direction change of meter right to left / Left to right V1 & V2
Pin 10. Jumper5 for turn off VU peak hold. V1 & V2
Pin 12. Jumper6 NOT USED V1 & V2
Pin 14. Jumper7 for Peak hold lock with reset when jumper shorted. If jumper left on then defaults to peak hold with decay drop back. V1 & V2
Pin 16. Jumper8 for switching to CV input. V1 & V2
Pin 17&18. +5v
Pin 19. -V
Pin20. +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.
SW jumper switched to 0v to switch to CV input for input on back terminals for Gain reduction.
Ver 2 software no long uses sync between meters. So Master/Slave jumper now used for CV voltage direction
Master/Slave jumper- CV change from 0>5 to 5>0
J6 open changes release time of PPM to roughly same as VU release time.
J6 closed changes release time of PPM to standard longer release time.
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.
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
Scale panel size 128mm (5.039") x 45mm (1.772") and fits Hammond Enclosure 1598B.
Rack version below
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.
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.
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.
The 15mm bolts screw into the 15mm spacers. Then the second PCB is bolted with 6mm x 3M bolts to the 15mm spacers.
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.
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.