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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 28th December 2015, 08:52 PM   #331
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Default * New IO Board Coming *

Per previous notice on this thread I am crafting a new IO PCB that expands the inputs from 1 to 5 selectable.

Inputs 1 & 2 will be balanced. Inputs 3,4 & 5 will be unbalanced. The outputs will be both balanced and unbalanced and muted turn on delay as same as the current IO board.

Your purchase will be for the new IO PCB as well as the RCA phono blocks (they are quality OEM parts) as well as the front panel selector switch. The selector switch has a splined shaft identical to the dimensions of the main board pots. Each board is a stereo pair.

The cost will be $20 for the IO kit plus actual cost to ship (shouldn't be much this time)

The following forum members have already notified me that they want one or more kits:

* Those wanting the NEW 5 Input IO kit

georgebrooke - 1 enhanced IO kit - PAID
Rick G - 1 enhanced IO kit - PAID
mik000000 - 1 enhanced IO kit - PAID
hfxrzw - 2 enhanced IO kits PAID
mordikai - 2 enhanced IO kits
vasillis - 2 enhanced IO kits - PAID
redjr - 1 enhanced IO kits + 1 PWR_Supply_PCB - PAID
zrxshack - 2 enhanced IO kits - PAID
raymondo - 1 enhanced IO kit
still4given - 1 enhanced IO kit
dennismiller55 - 1 enhanced IO kit - PAID
Phillipp23 - 5 enhanced IO kits
PJN - 1 enhanced IO kit - PAID
djonesii - 1 enhanced IO kit
kimon - 1 enhanced IO kit
bfg4wd - 1 enhanced IO kit - PAID
emyeuoi - 1 enhanced IO kit - PAID
rock12 - 1 enhanced IO kit - PAID
herb1diaz - 2 enhanced IO kits
Mraudionut - 2 enhanced IO kits + 1 PWR_Supply_PCB - PAID
TFW - 1 enhanced IO kit - PAID
OZAM - 2 enhanced IO kits

I will leave this up for a couple of weeks while I accumulate the parts. Let me know if you want to be added.

I have also ordered a few more project main & power supply PCBs for those that have contacted me recently.

* Those wanting a complete kit (includes the new 5 input IO board)

sasha70 - 1 kit + 1 PWR_Supply_PCB - PAID
HaroldHill - 1 kit + 1 PWR_Supply_PCB
analog4ever - 1 kit + 1 PWR_Supply_PCB - PAID
vu2ets - 1 kits + 1 PWR_Supply_PCB

** Let me know if you want a complete kit. **
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Carl Huff
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Old 29th December 2015, 12:01 AM   #332
Rick G is offline Rick G  United States
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Doug Self Preamp from Linear Audio #5
Still4given,
Terry, is your offer for a PDF of you PS Board still on.? If so i would like to try it.

Rick
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Old 29th December 2015, 01:13 AM   #333
still4given is offline still4given  United States
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Rick G View Post
Still4given,
Terry, is your offer for a PDF of you PS Board still on.? If so i would like to try it.

Rick
Hi Rick,

Sure. Here is the PDF for Iron transfer. Let me know if you need something different.

Blessings, Terry
Attached Files
File Type: pdf Preamp PSU iron transfer.pdf (52.7 KB, 157 views)
File Type: pdf Preamp PSU solder helper.pdf (17.6 KB, 120 views)
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Old 29th December 2015, 02:26 PM   #334
PJN is offline PJN  United States
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Hi All,

I'm ordering parts now, having problems sourcing the LM4562 from Digkey, says the min quantity to order is 200 units. I searched and saw mention of using the NJM4562 earlier in the thread. what are you using and where did you get them ?

Thanks,

Paul
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Old 29th December 2015, 07:19 PM   #335
PJN is offline PJN  United States
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Never mind, I was able to find them at Newark for $3.12 each, if anyone else needs them better hurry up they only have around 300 or so left.
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Old 29th December 2015, 09:09 PM   #336
Rick G is offline Rick G  United States
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Doug Self Preamp from Linear Audio #5
Still4given,
What is the size of the board.?

Rick
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Old 29th December 2015, 11:30 PM   #337
still4given is offline still4given  United States
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Rick G View Post
Still4given,
What is the size of the board.?

Rick
100mm x 45mm, 3.93" x 1.77"

I just built one this morning with L7824/KIA7924 regulators. Puts out +-26.8VDC.

Pretty cool.

Last edited by still4given; 29th December 2015 at 11:34 PM.
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Old 30th December 2015, 03:51 PM   #338
orjan is offline orjan  Sweden
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Location: Stockholm
Hi,

Finally had time to start to build.

2 questions:
- pots are in schematic marked 5k exept for volym that is marked 5k lin, I guess all pots are lin?
- the Nichicon caps in the BOM are NP as far as I understand, on the PCB some are marked with a +. I guess that's if someone want's to use polarized caps?

/örjan
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Old 30th December 2015, 04:08 PM   #339
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by orjan View Post
Hi,

Finally had time to start to build.

2 questions:
- pots are in schematic marked 5k exept for volym that is marked 5k lin, I guess all pots are lin?
- the Nichicon caps in the BOM are NP as far as I understand, on the PCB some are marked with a +. I guess that's if someone want's to use polarized caps?

/örjan
Yes on both questions.
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Carl Huff
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Old 30th December 2015, 04:10 PM   #340
PJN is offline PJN  United States
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Join Date: Dec 2004
Location: Pa, USA
I'm starting to put together a case for my pre, I printed out the graphic that Carl posted (front panel 00)on 8 1/2" x 11" paper in landscape mode to see if it would line up with the pots on the board, didn't fit, came up a bit short. I was planning on printing a decal on a transparency to apply to the front. Did anyone figure out the correct size for the panel print out yet ?

Paul
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