sontec 1 RU build thread

farnell #1636659

some values are available for this project...

they are very expensive around 20$ each 
and they are oversized... but possible to fit them to the PCB.
are they any good for this EQ, or they meant to be used on some high voltage etc stuff

they look mean


this is for poly cap list

AUDIO CAPACITOR, 1UF, 630V
Application:Audio
Capacitance:1µF
Tolerance, Capacitance:± 10%
Series:FE-XAL
Voltage, Rating:630V
Capacitor Dielectric Typeolyester
Case Style:Axial
Termination Type:Axial Leaded
Diameter, Body:35mm
Length / Height, External:54mm




i have founded 0.1% resistors, they are tiny... with no legs... but still possible to make them fit on PCB.

OMG!!! No, just order normal parts from Franell/Mouser/Digikey, leave this stuff!!!!
Do you have a bit of feel of humor btw?

;D

raffaelebonetti said:

Hello Everyone,

I am very confused on what transformer to buy for this project. I will be powering one dual channel unit. Can someone refer to an ideal transformer from Newark or any other company!

Thanks and Cheers!
Raffaele

Click to expand...

Anyone? Please help!

What PSU are you using?  What's your location? 

18-0-18 for 24V operation,
am i right ?

Use 15-30w toroidal trafo, 2x (~24v)

khstudio said:

What type of KNOBs are these & were can I find them :?:
... anywhere in the US?

I really like the look (or something similar)

Click to expand...

Ive looked in Farnell and others but can't find the small (shape/Q) knobs in grey
Is the pic of Igor's build? - if so can you tell me where you got your supply of knobs.
Thanks in advance

Hi Mikey, I got my knobs from Elma Israeli distributer. They available from Farnell as well.
IIRC there are Cat Nr's at this thread elsewhere.

Farnell codes for Elma knobs:
1209827
1209793
1209799
1209801
1209803
1209807
1209805
1209808
1209809
1209810
1209811
1209749
1209758
1209775
1209825

MikoKensington said:

What PSU are you using?  What's your location? 

Click to expand...

I am using 24v. PCB board supplied by Igor!

Igor said:

Use 15-30w toroidal trafo, 2x (~24v)

Click to expand...

Thanks for the information Igor! I appreciate it.

Now, I am right with this choices, which would work the best?

http://www.newark.com/multicomp/mcfe050-25/transformer-50va-2-x-25v/dp/38K4554?_requestid=32364
http://www.newark.com/multicomp/mcfe015-25/transformer-15va-2-x-25v/dp/38K4544?_requestid=32734

Or this  other type:

http://www.newark.com/multicomp/mcta120-25/_/dp/38K4907?_requestid=33242

Thanks for you help!
Cheers!

i have founded this :

direct replacement discrete op-amp for opa2604

http://www.bursonaudio.com/burson_opamp.htm
(scroll down a little)

anyone used  this on Sontec EQ, or any other project. any opinions

kambo said:

i have founded this :

direct replacement discrete op-amp for opa2604

http://www.bursonaudio.com/burson_opamp.htm
(scroll down a little)

anyone used  this on Sontec EQ, or any other project. any opinions

Click to expand...

Nice one!

I'd also like to know how they sound and work.

Also noticed this google add

Rafael, I hope you use +/- 24V I supplied with kit, right?

This one seems fine:
http://www.newark.com/multicomp/mcfe050-25/transformer-50va-2-x-25v/dp/38K4554?_requestid=32364

Never tried Burston op-amps, but IMHO opa2604 are really good price- and quality- wise in Sontec.

Igor said:

Rafael, I hope you use +/- 24V I supplied with kit, right?

This one seems fine:
http://www.newark.com/multicomp/mcfe050-25/transformer-50va-2-x-25v/dp/38K4554?_requestid=32364

Never tried Burston op-amps, but IMHO opa2604 are really good price- and quality- wise in Sontec.

Click to expand...

Yes I am! Thanks for your help Igor!
Cheers!

hey guys,

I just cracked open the knobs that I got from Igor with the PCB's after many months.  I'm a little confused with the 5k Lin pots and the 100k Rlog pots.  2 of the 5k pots (of 10 in the package) have 5 legs, 3 in front, 2 in back.  The PCB accepts 5 legs, so where do I put the 2 I have?

The 100k pots have 6 legs, with a ground leg (?) in the back, but the PCB doesn't accept this ground leg, so do I just clip that off?

Also, should there have been nuts for the pots included?  I did not get any, so just curious...

Have read through this thread, but can't seem to find that info.

Thanks!
Sig

The pictures I have of completed units have the 5 legged pot in the Lo Q position on the far left.

Steve

It's all been discussed folks - the five legged pot has a switch built-in, if turned fully counter-clockwise, so you can have a shelving or peaking low band.

hth, christoph

Ahh cool.  Well, I've read this entire thread, and I'll be honest I have not seen this before.  So the pads on the other 5k pots can just remain empty then?

What about the 100k pots and the extra leg?  And are nuts necessary for the pots?

Thanks a bunch,
Sig