The Don Classics NV73EQ Manuale utente
the DON classics
www.thedonclassics.com
NV73EQ
(ADD-ON)
ASSEMBLY GUIDE
REV: 1:00
© the DON classics 2015 page 1 of 20
QUICK A EMBLY GUIDE
8 STEPS TO EQ HEAVEN!
1. Place/solder parts on PCB
2. Fit rotary switch pins
3. Wire pots
4. Make ribbon cable
5. Wire to NV73 micpre
6. Place PCBs in metal work
7. Initial test
8. Attach knobs
Equalise!
NOTE: This anual assu es that you already have a fully working 'NV73' icpre and are
upgrading it to the 'NV73EQ' with the 'NV73EQ-Add-on'
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Frequently Asked Questions (FAQ)
Q. What is the difference bet een the 'NV73EQ' & 'NV73EQ add-on'?
A. The 'NV73EQ' is a 2 space ic-pre & EQ unit.
The 'NV73EQ-Add-on' is for people already with the NV73 ic-pre who want to upgrade it to the 'NV73EQ'
Q. What is included in the addon kit?
A. Everyth ng ncluded on th s page s ncluded n the k t from us.
Q. What other orders do I need to make?
A. You need to make 2 other orders as deta led on th s page.
Q. Is there a schematic that ould be useful?
A. For reference you can download the NV73EQ schemat cs from the DON class cs webs te. NV73EQ Schemat cs
PCB des gnat ons reference th s.
Q. Who can build this?
A. You!
As long as you have pat ence and are thorough n your work, anyone can bu ld th s add-on. There's not a lot to the c rcu try
and s qu ck to complete w th very m n mal w r ng. There's lots of support and nformat on and t s tr ed and tested.
Q. Ho close to the original does it sound?
A. Spot on. We have chosen not to do any “new and mproved” updates on a c rcu t that sounds so good. We have chosen the
same parts that was used or g nally and recommend th s. Th s ncludes large footpr nts for the mustard caps / polystyrene caps
wh ch were used n the v ntage un t. And the add-on c rcu t jo ns to the m c-pre n exactly the same way as the v ntage un t.
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1. older parts on PCB
When nsert ng parts there are 3 resources that w ll be useful.
A) ilkscreen images (eg. for any hard to read designations)
S lkscreens can be downloaded on the manual page: s lkscreens
B) General BOM (eg. For ore info on specific parts/values)
General BOM can be found on the manual page: General BOM
C) chematic (eg. For general confir ation of circuit)
General BOM can be found on the manual page: Schemat cs
Armed w th that nfo, let's start!
Insert all parts on to the PCB as marked on the s lkscreen. All designations and values for parts are arked on the PCB for ease
TIP :
Start w th smaller parts (res stors etc.) and work up to the larger parts
Solder nl ne sockets for trans stors on both EQ boards
F t bottom parts f rst on BTM PCB as there'll be less room to solder up top.
Make sure no metal legs protrude too much on the TOP PCB
All the small 1/8W s zed res stors near the rotary sw tches are 4M7 f not stated otherw se.
Green molex K & 24V open ng should face the m ddle rotary sw tch
Green molex P & 0V open ng should face the PCB cutout
The 47pF caps are a hot top c.. some v ntage un ts have them removed, some don't. They exh b t a large drop n the top end when
EQ s pushed n, however f you are try ng to emulate a part cular v ntage un t then the footpr nt s there. It's up to you!
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PCBs should end up looking like this...
TOP PCB:
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TOP PCB (underside):
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BTM PCB:
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BTM PCB (underside):
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2. Fit rotary switch pins as shown
Before nsert ng the stopper p ns conf rm that the common leg shorts to leg 1 of the sw tch (edge closest the common p n)
If t doesn't, tw st the shaft to the pos t on where t does. OR nsert the p n n 12 o'clock, and then tw st the shaft
ant clockw se all the way. (E ther method w ll work)
F t the stopper p ns n the pos t ons shown (or a bit of co ponent leg if you have isplaced the pins!)
Place the metal st cker over the p ns (remove the nner m ddle c rcle st cker)
NOTE: For the presence setting (there was an extra position of 10kHz. Achieved si ply by an extra cap in an extra switch position.
I've included this cap so you will have the extra position of 10kHz.
If you prefer, you can of course set this rotary switch to just the 7 positions like the 1073 & front panel.
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3. Wire the pots
W re pots as shown:
TIP: A little heatshrink will keep things neat and ake sure no shorts happen between connections.
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Indice
