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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 7th October 2018, 05:32 AM   #1201
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Quote:
Originally Posted by Carl_Huff View Post
Yup, that's it minus the Lorlin front panel switch. Mouser stocks them now.
Thank Carl, but will you ship the pots from Tayda with the PCB kit?
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Old 7th October 2018, 05:53 AM   #1202
Carl_Huff is online now Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
Thank Carl, but will you ship the pots from Tayda with the PCB kit?
I do not supply the pots. Buying the pots has been left up to the builder.

Is buying those pots a problem for you?
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Best Regards,
Carl Huff

Last edited by Carl_Huff; 7th October 2018 at 05:58 AM.
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Old 7th October 2018, 06:08 AM   #1203
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Quote:
Originally Posted by Carl_Huff View Post
I do not supply the pots. Buying the pots has been left up to the customer.

Is buying those pots a problem for you?

No I am asking because they were part of the kit in the beginning, I am doing my BOM list right now and i am checking what do i have new to buy (not in my inventory), thanks
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Old 7th October 2018, 12:11 PM   #1204
batteryman is offline batteryman  United Kingdom
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Join Date: Jun 2011
Location: SCOTLAND
Default Omeg green pots now available in the UK

At last my order of 4k7 pots arrived so can get on with the build

CPC still have 90 in stock.

https://cpc.farnell.com/omeg/pc2g16e...4k7/dp/RE04429
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Old 7th October 2018, 08:42 PM   #1205
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
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Quote:
Originally Posted by DoubleIPA View Post
Thanks!

I'm finding several parts, like the aluminum electrolytic capacitors (UES1V101MPM), to be out of stock at mouser and digikey. I found a few on arrow.com, but not all of them and it seems like many are back-ordered until Feb 2019. Looks like I'll be waiting a while.
look at TME
They dispatch in New Zealand

Last edited by Hicoco; 7th October 2018 at 08:45 PM.
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Old 10th October 2018, 01:33 PM   #1206
Freecrowder is offline Freecrowder  United States
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Join Date: Jun 2007
Thanks HADIHF for the I/O schematic. Very Nice. Needed for troubleshooting. Can anyone take a quick measurement of the output of the 12v reg on their boards and report your voltage? Mine measures 17vout with 19vdc input. I expect the 19 in that is what the power supply is. I checked for orientation and then replaced it but still the same. Everything works okay but it's just bugging me.
BTW build your own cables everything can be purchased from Amazon. Much cheaper in the long run.
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Old 10th October 2018, 02:45 PM   #1207
manamanam is offline manamanam  Greece
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Join Date: Jun 2009
Location: Athens
Quote:
Originally Posted by Freecrowder View Post
Thanks HADIHF for the I/O schematic. Very Nice. Needed for troubleshooting. Can anyone take a quick measurement of the output of the 12v reg on their boards and report your voltage? Mine measures 17vout with 19vdc input. I expect the 19 in that is what the power supply is. I checked for orientation and then replaced it but still the same. Everything works okay but it's just bugging me.
BTW build your own cables everything can be purchased from Amazon. Much cheaper in the long run.
Reg output should be 12VDC and input should be 17VDC
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Old 10th October 2018, 03:17 PM   #1208
paulf is offline paulf  United Kingdom
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Join Date: Sep 2004
Location: Europe
Quote:
Originally Posted by Freecrowder View Post
Thanks HADIHF for the I/O schematic. Very Nice. Needed for troubleshooting. Can anyone take a quick measurement of the output of the 12v reg on their boards and report your voltage? Mine measures 17vout with 19vdc input. I expect the 19 in that is what the power supply is. I checked for orientation and then replaced it but still the same. Everything works okay but it's just bugging me.
BTW build your own cables everything can be purchased from Amazon. Much cheaper in the long run.
Hi Freecrowder - some reports of regulator oscillation in thread #1058 and onwards. This results in the o/p voltage sitting ~2 V below the i/p voltage, which sounds like what you are seeing. Suggested fixes were additional capacitance - one user suggested soldering SMD caps directly on the regulator pins, on the underside of the board.
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Old 11th October 2018, 03:08 PM   #1209
Freecrowder is offline Freecrowder  United States
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Join Date: Jun 2007
Excellent info paulf! Iv'e never experienced an oscillating 3 terminal reg before. I'll reference the data sheet for solutions.
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Old 12th October 2018, 02:46 PM   #1210
Freecrowder is offline Freecrowder  United States
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Just an update. A 22uF tantalum directly across output to common solved the problem. I also notice that both pass transistors on the DC PS run much cooler now. You couldn't hold your fingers on them for more than 5 seconds before.
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