PGA2500 KITS: AVAILABLE. BLACK PCB, SUPPORT THREAD.

« **on:** February 01, 2009, 11:53:47 AM »

Hi people!

Once I took a look on PGA2500 datasheet, it was some years ago,
I said "Hmmm....crap! Another chip pre? Nope!"
My bad taste is discrete, trafo-coupled, colored, etc. I'd cut my hand if I go to build chip-based pre!
Then, I heard evaluation board and said "Hmmmm....Too fast and clean to be truth!"
Many commercial pre's based on this chip appeared on market, like HV-3R, Prism Orpheus, etc.
Most of them are in very high priced range....
Well, there was PGA2500 thread on this forum...
I built a proto and was very surprised.
Studio people who tested this proto wery liked it as well.
This pre deserves name of an excellent clean preamp.
Use poly caps on input and good output stage, this is the cooking receipt.
And yes, it is possible to fit 8 pre's in 1RU.

Here's finnished, tested, fixed and polished final version of pcb's.

« **Reply #1 on:** February 01, 2009, 12:00:44 PM »

I do not see the project listed on your ordering page: http://www.groupdiy.com/index.php?topic=29771.0

How much will these be?

« **Reply #2 on:** February 01, 2009, 12:08:37 PM »

Wait

« **Reply #3 on:** February 01, 2009, 01:35:22 PM »

PGA2500 AUDIO BOARD BOM

Qty Value Device Parts
CONNECTORS
4 MOLEX-3 +/-U, OUT, OUT1, OUT3
3 JUMPER 2 PIN 0DB, DCEN, ZCEN
1 2 ROW 10 PIN INS
1 3.81 PITCH MOLEX6 PS
1 NC3FAH CON-NEUTRIK_AG_NC3 INPUT
1 NC3MAH CON-NEUTRIK_AG_NC3. OUTPUT
1 M2 ROW 8 PIN SPI

MISC
4 FERRITE BEAD 10MM PITCH L1, L2, L3, L4
1 100k 25TURNS TRIM_RJ9W CMRR

C-CERAMIC PS BYPASS
5 .1U (47N-224) X50V 5MM PITCH C1, C2, C6, C19,C20
6 224 (47N-224) X50V 5MM PITCH C21, C22, C23, C24, C29, C30

C-POLY
2 u47 7.5...10.5MM WIMA C9, C10
2 1U 7.5...10.5MM WIMA C7, C15

C-POLY OR SILVER MICA
4 33p 5MM WIMA C11, C12, C27, C28
1 100p 5MM WIMA C13
2 330p 5MM WIMA C31, C32
1 1N 5MM WIMA C33

C-TANT 10V 2.5MM PITCH
3 10...47U C3, C4, C5

C-LYTHIC
1 100u_63v PITCH 5MM C8
2 220-330UF 35V PITCH 5MM C14, C16
2 50u 35V PITCH 2.5MM C25, C26

INPUT CAPACITORS
2 6.8..10u 63v POLY CIN11, CIN21
OR AXIAL/RADIAL LYTHIC 10...47 UF 63V

RESISTORS 0.25W MF 7.5MM PITCH
1 3r3 R-EU_0204/7 R36
4 10r R-EU_0204/7 R4,R11, R12, R16, R17
2 50r R-EU_0204/7 R24, R25
1 120 R-EU_0204/7 R10
1 340 R-EU_0204/7 R6
2 1k33 R-EU_0204/7 R5, R7
3 4K7 R-EU_0204/5 R20, R21,R43
2 6k8 R-EU_0204/7 R8, R9
4 8k66 R-EU_0204/7 R30, R31, R32, R33
4 10k R-EU_0204/7 R34, R35, R41, R42
6 30k R-EU_0204/7 R22, R23, R26, R27, R28, R29
2 3M3 R-EU_0204/7 R13, R14

RESISTORS 0.125W NON-MF
4 10k 4X10K PULL-UPS RN1
4 4k7 R-EU_0207/2V R37, R38, R39, R40

SEMICONDUCTORS
4 * 1N4148. D1, D2, D3, D4
4 PN2222 OR 2N3904 Q1, Q2, Q3, Q4
1 78L05 TO-92 IC2
1 79L05 TO-92 IC3
1 OPA2604 OR NE5532 IC1
1 PGA2500 PGA2500 U1

RELAYS
4X NAIS TX2-5V HPF,PHASE,PAD,48V
Order Code: 1148605

« **Reply #4 on:** February 01, 2009, 01:35:55 PM »

BOM FOR CONTROLL PCB

Qty Value Device Parts

CONNECTORS
2 9 PIN PCB INTERCONNECT M
2 9 PIN PCB INTERCONNECT F
1 M2 ROW 8 PIN SPI
1 FLAT CABLE WITH 2X8PIN CONNECTORS, ~150MM

CAP-CERAMIC
2 0.1-0.22 UF 50V 5MM PITCH C2, C1
2 15N 50V 5MM PITCH C13, C14
CAP-LYTHIC
1 220u 10v 3.5MM PITCH C3
RESISTORS
13 10k 0.125W 5MM 5% R8, R9, R10, R22, R23, R24, R25, R28, R29, R42, R43, R44, R45
12 470 0.125W 5MM 5% R1, R2, R18, R19, R20, R21, R26,R3, R4, R5, R6, R7

3 2N3904 OR PN2222 T1, T2, T3
1 LED3MM RED LED3MM CLIP
1 PGA2500-CONTROLL PRE-PROG'D PIC U$2

1 4511D 4511SMD IC4
Order Code: 9666532

3 MEC SWITCH 3F1D MEC 48, HPF, PHS
Order Code: 1132902

3 SWITCH CAP
Order Code: 1132951

1 ALPS_ENC ROTARY ENCODER RE
Order Code: 1520809

2 HD-F103 7-SEG CC LED DISPLAY X1, X10
BLUE: Order Code: 1200600
OR: HDSP-A403, HDSP-A153, HDSP-7503 HDSP-7403 HDSP-7803, HDSP-A803 ETC.

« **Reply #5 on:** February 01, 2009, 01:36:32 PM »

PGA2500 POWER SUPPLY BOM

Qty Value Device Parts
CONNECTOR MOLEX 3.81MM X6
1 MT6-6Y PS

DIODES
6 1N4004 D1, D2, D3, D5, D8, D10
4 1N5400 D4, D6, D7, D9
2 1N5822 D11,D12

CAPS-CERAMIC
6 0.1 50V 2.5MM C9, C12, C14, C15, C20, C21
2 0.1 100V 7.5MM C2, C4

RESISTORS
1 10k R-EU_0207/10 R3
3 200 R-EU_0207/10 R1, R4, R7
1 rx+ R-EU_0207/10 R5 FOR 24V, USE 3K57; FOR 18V, USE 2K7
1 rx+ R-EU_0207/10 R2 FOR 48V, USE 7K5
1 rx- R-EU_0207/10 R6 FOR 24V, USE 3K57; FOR 18V, USE 2K7

CAPS-LYTHIC
4 100u 50V 3.5MM PITCH C10, C11, C13, C16
1 100u63v 5MM PITCH C5
1 33-47u 100v 5MM PITCH C3
3 220u 100v 7.5MM PITCH
1 1000x10v 5MM PITCH
2 3300u 10MM PITCH

IC, MISC
1 317 LM317TS
1 337 LM337TS
1 783 TL783
1 LM2576_5V
1 INDUCTOR 100-150UH 1.5-2A
2 HEATSINK

« **Reply #6 on:** February 01, 2009, 02:21:00 PM »

thought it was just my sister in law that likes to make big entrances, but no, seems the whole of Israel likes to do this

stunning (as usual) looks like bankruptcy is fast becoming a reality for me, and looks like i shall put a small marker at your door as partly responsible

Iain

« **Reply #7 on:** February 01, 2009, 09:02:20 PM »

Now if this had MIDI control so it could be one of 128 units in a remote preamp with digital output my dreams would answered

« **Reply #8 on:** February 02, 2009, 01:56:36 AM »

Maybe in a future

« **Reply #9 on:** February 02, 2009, 11:12:47 PM »

Why is the cad dollar so low compared to the Euro....i;ll never afford one your kits!

« **Reply #10 on:** February 03, 2009, 04:22:09 AM »

This is excellent!
After waiting two years for this, I almost lost hope that someone will write the code to controll the PGA2500. ( http://www.groupdiy.com/index.php?topic=2148.0 )
By the way, the preamp I was talking there was the Lavry Blue mic preamp (based on the PGA2500) ( http://www.lavryengineering.com/white_papers/4496-2-01.pdf ) and it sounded cleaner than some other very good, clean preamps like the Cranesong, Millennia HV3D and DAV.

I have a question Igor.
I have my different idea of designing the front end and the output buffer for this preamp, so I do not need the preamp PCB. There is any chance you can sell only controller boards with programmed microcontrollers? If yes, how much would they cost?
Please, say yes.

chrissugar

« **Reply #11 on:** February 03, 2009, 04:26:57 AM »

Depending on how many boards you need. I have to brake a pcb set for this,
or make a batch of controller's PCB's only.

« **Reply #12 on:** February 03, 2009, 04:38:24 AM »

Probably 8 for starting but maybe more in time (up to 24). Can you give me an estimated cost?
Many thanks.

chrissugar

« **Reply #13 on:** February 03, 2009, 04:43:42 AM »

For 8 controll boards with PIC's, it will be EUR22/set. For 24 controll boards, EUR17/set.

@3nity: take only pcb's+PIC, and order the rest by yourself,
it comes up a bit cheaper if you don't count in time spent to
order all parts and shipping cost.

« **Reply #14 on:** February 03, 2009, 05:05:50 AM »

Hmmm, very very tempted to buy 24 from the begining because of the price break. Although I don't know if I can afford at this moment to invest over 400eu only in the controllers.
Will think about it and tell you what I decided.
Thanks again.

chrissugar

« **Reply #15 on:** February 03, 2009, 05:15:51 AM »

No probs, take your time. IMHO it is excellent price

« **Reply #16 on:** February 03, 2009, 06:30:57 AM »

After reading again what you wrote here:

Quote from: Igor on February 03, 2009, 04:26:57 AM

I have to brake a pcb set for this,or make a batch of controller's PCB's only.

it made me realise that maybe it is better to ask if you would sell preprogrammed microcontrollers, because that way you don't have to break PCB sets.
Also shipping of the chips would not depend on waiting for PCB fabrication.

Thinking about it, it became clear that it is not absolutelly necessary for me to have the controller board. I will not include the polarity, high pass filter and pad switches in my preamp so I can also make my own simplified version of controller pcb, with only gain control and phantom power.
What do you think?

chrissugar

« **Reply #17 on:** February 15, 2009, 09:18:00 PM »

Bump! People interested in PCB's/kits? Only 4 kits left.

« **Reply #18 on:** February 24, 2009, 07:23:26 PM »

Wich Toroid do you recommend? some 18 - 0 - 18 at the secondary?
This one here will work? 30VA is enough for 4 pres?

Why do you suggest that the PSU could be 18V or 24V? is any related with using NE5532 or OPA2604? please let me know

Cheers!!!!

Eddie

« **Reply #19 on:** February 25, 2009, 02:38:55 AM »

Kits comes with opa2604, my guess is to run them from 22-24V.
Farnell have some nice 2x25V toroids, cheaper a bit than EUR20.
30W is enough.
If 5532 will be used, 18-0-18 will work, just calculate power supply resistors,
for 5532 it should be 18V.
The logic is very simple:

if output is 18V, voltage drop on 200R is 1.25V and on Rx is (18-1.25)V...

(200/1.25)=(Rx/16.75)

Rx in Ohms

The rest is plain math.

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