EQN build thread

[jplebre]

Hey Jp have you ever noticed how much brown and red look alike in those resistor lines? 

all the time. I'm such a nerd now that I always turn them left - right, Up - down takes longer but makes it easier!

Cheers!

 

[duantro]

Finished the pair up today. They worked and sound great! ...well after I realized I forgot the 24V jumper for my 51x juice! Thanks Peter for such an awesome project that is so easy to build.

 

[jplebre]

Looking great. Loads of trident stuff you got there

 

[duantro]

Looking great. Loads of trident stuff you got there

Yeah, 4 channels of the s80 tridents. I really like them. I'm also realizing that I'm a lazpro poster child. 3 api 525's, 2 la3a's, and now a pair of eqn's. I really like Peter's offerings as well.

 

[jplebre]

I have the new 525's and they rock hard.

 

[duantro]

Ok, calibration was pretty straight forward. I use one for a vocal mic and man they sound good! I like them so much that I grabbed another pair from the black market, so that I can have 4, to mate with my 80 series pres.  ;D

 

[Bassniac]

Hi folks.

I am quite new at the DIY Buisiness. Until now I sucessfully build 6 DonClassic NV 73 preamps and love their sound and one EQN.
The second one will not work.

Until now I figured out that the problem must be located in the Output Amplifier Section. I reheated all the solder points and checked for Solder bridges. Furthermore I replaced all the Transistors TR1/TR2/TR3 with brand new ones. Instead of 184Cs I use 549s. In my second and working unit there are the same Transistors, no problem so far.
I hooked up the module to a 24V PS and get about 23,6 V at the Opamp 24V points, thats exactly as much as my PS supllies. Same at R27. At the EAs Primary I measure 18 V as well as at R35. At the Transistors I measure almost nothing and TR3 doesnt get anything as it is not getting warm. But the EA Tranny will heat up quite fast and that doesnt happen at my working unit. I got Petes schematics and the BA283 schematics from the original Neve 1073 manual and the one that was adapted to Petes EQN and was posted here somewhere. The Resistors seem to be right as I opticalle compared them to my working unit. The Caps look fine and the polar ones are installed the correct way.

Perhaps some more experienced troubleshooter could give me any hint at what I should look next.

Greets, Mathias

 

[jplebre]

The second one will not work.

what exactly is happening (or not happening)?
no sound, distortion? crackling sounds? hum? sound passes but no eq?

 

[Bassniac]

Exactly nothing is happening. No sound passes through. Only the EA Output Trany heats up. The unit seems to short the power line as even my preamps wont work if installed into the 51x rack with the EQN.

Cheers

 

[Bassniac]

I think I got it and narrowed down the problem to the EA 1166.
The primary windings are short to the Chassis of the Transformer and the chassis is grounded. This will explain the behaviour in my circuit with the heating up of the X-Former. I again did continuity checks around the X-Former and could narrow down the problem to the X-former as the adjacent parts are short to ground at the X-Former near sides and are well isolated from ground at their X-Former far sides. The other X-Former in my second  and working build doesnt show that behaviour. I think I need a replacement as I suppose I got a defective X-Former.

 

[Bassniac]

Wasnt the EA XFormer. Nervertheless, problem solved, Unit is running. Somehow TR3s Collector was shorting to ground via its Heatsink. Some heatshrink tube cured it.

Cheers.

 

[thesolidshadow]

Hereby my bom ordered at farnell, note the 2 times lr2 reistor because of supplyer ran out of stock. so far i can tell the r720 resitor is missing since i couldnt find it at the website and transistors are missing because i ordered the originals.

hope it is anyone her/his help:

Artikelnummer Aantal besteld Productomschrijving Fabrikantnummer
2329993 10 RESISTOR, METAL , 10R, 0.6W, 1%; Product LR1F10R
2330004 10 RESISTOR, METAL , 120R, 0.6W, 1%; Produc LR1F120R
2330197 10 RESISTOR, METAL , 604R, 0.6W, 1%; Produc LR1F604R
2330201 10 RESISTOR, METAL , 620R, 0.6W, 1%; Produc LR1F620R
2330226 10 RESISTOR, METAL , 820R, 0.6W, 1%; Produc LR1F820R
2330037 10 RESISTOR, METAL , 1K2, 0.6W, 1%; Product LR1F1K2
2330048 10 RESISTOR, METAL , 1K8, 0.6W, 1%; Product LR1F1K8
2330087 10 RESISTOR, METAL , 2K2, 0.6W, 1%; Product LR1F2K2
2330092 10 RESISTOR, METAL , 2K7, 0.6W, 1%; Product LR1F2K7
2330130 10 RESISTOR, METAL , 3K3, 0.6W, 1%; Product LR1F3K3
2330135 10 RESISTOR, METAL , 3K9, 0.6W, 1%; Product LR1F3K9
2330191 10 RESISTOR, METAL , 5K1, 0.6W, 1%; Product LR1F5K1
2330007 10 RESISTOR, METAL , 12K, 0.6W, 1%; Product LR1F12K
2330031 10 RESISTOR, METAL , 18K, 0.6W, 1%; Product LR1F18K
2330083 10 RESISTOR, METAL , 27K, 0.6W, 1%; Product LR1F27K
2330110 10 RESISTOR, METAL , 33K, 0.6W, 1%; Product LR1F33K
2330125 10 RESISTOR, METAL , 39K, 0.6W, 1%; Product LR1F39K
2330186 10 RESISTOR, METAL , 56K, 0.6W, 1%; Product LR1F56K
2330206 10 RESISTOR, METAL , 68K, 0.6W, 1%; Product LR1F68K
2329987 10 RESISTOR, METAL , 100K, 0.6W, 1%; Produc LR1F100K
2330002 10 RESISTOR, METAL , 120K, 0.6W, 1%; Produc LR1F120K
2330029 10 RESISTOR, METAL , 180K, 0.6W, 1%; Produc LR1F180K
2330232 10 RESISTOR, METAL , 8K2, 0.6W, 1%; Product LR1F8K2
1800618 4 CAPACITOR, RADIAL, 10V, 680UF; Product R EEUFR1A681
1831270 8 CAP, ALU ELEC, 470UF, 16V, RAD; Product 16ZLJ470M8X11.5
2330211 10 RESISTOR, METAL , 6K2, 0.6W, 1%; Product LR1F6K2
2330213 10 RESISTOR, METAL , 6K8, 0.6W, 1%; Product LR1F6K8
2330223 10 RESISTOR, METAL , 7K5, 0.6W, 1%; Product LR1F7K5
1834179 10 CAPACITOR, RADIAL, 100V, 0.47UF; Product MAL203859477E3
1651089 10 DIODE, POWER RECTIFIER,35V,1A,DO-41; Dio 1N4001
1621627 10 DIODE, ZENER, 27V, 1W; Zener Voltage Vz 1N4750A
608609 10 INDUCTOR, 1MH, 5%, 130MA, 1.6MHZ; Produc B78108S1105J
1141756 5 CAP, CERAMIC, 10PF, 50V, C0G/NP0, RAD; P K100J15C0GF53L2
1141762 5 CAPACITOR, 47PF, 50V; Product Range:VISH K470J15C0GF53L2
1141767 5 CAPACITOR, 220PF, 50V; Product Range:VIS K221J15C0GF53L2
1141768 5 CAPACITOR, 330PF, 50V; Product Range:VIS K331J15C0GF53L2
1141769 5 CAPACITOR, 470PF, 50V; Product Range:VIS K471J15C0GF53L2
1141770 5 CAPACITOR, 680PF, 50V; Product Range:VIS K681J15C0GF53L2
1141771 5 CAP, CERAMIC, 1000PF, 50V, C0G/NP0, RAD; K102J15C0GF53L2
1005987 5 CAPACITOR, 4.7NF, 63V; Product Range:WIM FKP2C014701D00JSSD
1166015 10 CAPACITOR, 0.015UF, 630V; Product Range: BFC237261153
9411887 25 CAP, CERAMIC, 0.1UF, 50V, Y5V, RAD; Prod MCFYU6104Z6
1753992 10 CAPACITOR TANT, 10UF, 25V, 20%, RADIAL; 489D106X0025D6VE3
1754021 8 CAPACITOR, TANTALUM, 25V, 22UF; Product 790D226X9025B2BE3
2079095 10 CAPACITOR, 68UF, 10V, 6.3X7MM; Product R EEAGA1A680
1800634 8 CAP, ALU ELECT, 470UF, 16V, CAN; Product EEUFR1C471
1006037 5 CAPACITOR, 0.47UF, 100V; Product Range:W MKS2D034701E00KSSD
2330333 10 RESISTOR, METAL , 3K6, 0.75W, 1%; Produc LR2F3K6
2330254 20 RESISTOR, METAL , 10K, 0.75W, 1%; Produc LR2F10K
1738612 10 RESISTOR, 2W, 5%, 12R; Product Range:TE ROX2SJ12R
1738620 10 RESISTOR, 2W, 5%, 47R; Product Range:TE ROX2SJ47R
2329535 70 RESISTOR, CARBON , 4M7, 0.25W, 5%; Produ CFR16J4M7
9353631 4 TRIMMER, 25 TURN 5K; Track Resistance:5k 3296Y-1-502LF
8795711 4 POTENTIOMETER, LINEAR, 10K, 1.5W, 10%; T PRV6SAABJYB25103KA
8795720 2 POTENTIOMETER, 50K; Track Resistance:50k PRV6SAABJYB25503KA
1653588 2 TRANSISTOR, NPN; Transistor Polarity:NPN 2N4401BU

 

[taliska]

Peter,

Just to clarify something...is "the James Fix" required for all variants of your pcb? (perhaps might be worth listing the various revs you ship for completeness sake and the corresponding status with regard to the fix too...just in case anyone else is wondering the same thing...)

Unfortunately I didn't notice it in the thread until my board was fully populated, so wasn't able to test continuity or a lack of it first, but judging by the copyright date (2009), I'm going to assume it is required...

Thanks,

Kaz

 

[duantro]

Taliska,
Read back in the thread to confirm, but if I remember correctly, the James fix was to even out levels while an eq section was disengaged. I built mine within the last few years, and did this fix, which works great. If you are wondering if the fix has been implemented in your circuit boards, just do a continuity check with a meter at the fix points.

 

[taliska]

Hey Duantro!

Thanks for the info. Yeah, I did do that continuity test, but unfortunately my boards are fully populated, and I wasn't sure that my continuity test could be trusted because of that. When I read through the thread, jrowell asked another member with unpopulated boards to do the continuity test, and perhaps I read too much in to that, but I took it to mean that he needed the additional input because his boards were also populated, and so couldn't be trusted because the additional connections caused a different, longer route between those two points! I'm not a whizz at this stuff, so I do my best the twisted logic in my brain, but it seemed to make sense to me... ;-)

Regardless, I did do the fix anyway, and nothing blew up, so that's good. ;-) I also ran it through fuzz measure after the fix (forgot to do it before though...doh!), and the response was flat with the LF section switched off, so it seems fine.

I got my boards and built them in the last few months, so I just figured a more official word on it might be in order given that jrowell found the fix quite some time ago and enough time has passed for there to be a newer revision, and for that information to be now incorrect...or not...who knows?! ;-)

Kaz

 

[jandoste]

Hey guys,

I don't know if there is a solution for my problem but I hope that you can give me an idea! I finished up my new 51X rack and it's ready to go! it's awesome! But before I was using API 500 rack so when I built Peter's EQN than I cut the latest pins( Okidoki I know that wasn't a good idea) and now I want to use these EQs with the 51X rack... my question is that it'll be possible to find any solution or I must forget to use them in 51X rack?



Thanks for any advices!

Cheers

 

[Dr Gris]

The 51X rack is designed to give you both +/- 15V and +/- 24V so I don't see a problem
unless you decided to build the PSU to only deliver 24V, but you didn't right?

Best
//M

 

[jandoste]

Thanks Dr Gris!
Yap, it has +/- 16V and +/-24V. So I can put them in the Rack without the pins 16 and 17! cool!

cheers,

The 51X rack is designed to give you both +/- 15V and +/- 24V so I don't see a problem
unless you decided to build the PSU to only deliver 24V, but you didn't right?

Best
//M

 

[jandoste]

my bad!
ok, it didn't work ??? I've cut the pin 16 and 17 that i used for the standard 500 f+%%%%k!
so I moved all components no needed for 24V but it won't work without these pins! any other solution?

Thanks

The 51X rack is designed to give you both +/- 15V and +/- 24V so I don't see a problem
unless you decided to build the PSU to only deliver 24V, but you didn't right?

Best
//M

 

[Dr Gris]

Hmmm....if I understand you correctly, you have cut off the last two pins that sat together
after the "notch" in the connector that goes into the Edac connector in the rack?
Those last two pins are for +24V DC (pin 17) and -24V DC (pin 18).
Looking at your pic, those are the ones you cut ( not pin 16 and 17)

You can still make the module work on +/- 16V in the 51X rack.
Pin 12 is + 16V DC and pin 14 is -16V DC. The last three gold plated pins in your pic is pin 12,13,14.
So you don't have to worry about that you have cut the last two pins

But what you have to do is to put back the components you took away to make it work again.
All those parts labeled "not needed for 51X" still has to be there.
And thats because you took the last two pins away.
" not needed for 51X" means you run it from the last pins (24V).

I hope I make sense.

Don't give up, and best of luck, I love my EQN's!!
//Magnus