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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 5th October 2018, 12:07 AM   #1181
DoubleIPA is offline DoubleIPA  New Zealand
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Join Date: Mar 2011
Location: Tauranga, New Zealand
BD Enterprises was great until shipping and the cheapest they'd do for $5.71 worth of product is $72. Will try to ship it to a friend in the USA and have them ship it over.
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Old 5th October 2018, 04:52 PM   #1182
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Doug Self Preamp from Linear Audio #5
Hi Carl,
Is The power supply PCB that you sent is the last PCB fully adjustable ? Because I don't have the BOM in the package you sent, i have the no adjustable Power Supply BOM (SERIES VREG_FIXED_PWR_SUPPLY.zip)
Thanks
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Old 5th October 2018, 05:00 PM   #1183
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
Hi Carl,
Is The power supply PCB that you sent is the last PCB fully adjustable ? Because I don't have the BOM in the package you sent, i have the no adjustable Power Supply BOM (SERIES VREG_FIXED_PWR_SUPPLY.zip)
Thanks
Some builders were struggling with the 'adjustable' nature of the power supply. Some to the point of blowing up op amps with over voltage. As result I began shipping a fixed voltage version. The voltage out is determined by a resistor pair.
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Carl Huff
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Old 5th October 2018, 05:24 PM   #1184
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
Some builders were struggling with the 'adjustable' nature of the power supply. Some to the point of blowing up op amps with over voltage. As result I began shipping a fixed voltage version. The voltage out is determined by a resistor pair.
Thank Carl, i saw also some post with builders complaining and asking for adjustable because there was different voltage between + and -.
is it to late because i prefer adjustable?? i also asked for the last version!!!!!!
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Old 5th October 2018, 05:50 PM   #1185
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
Thank Carl, i saw also some post with builders complaining and asking for adjustable because there was different voltage between + and -.
is it to late because i prefer adjustable?? i also asked for the last version!!!!!!
The fixed voltage reg supply that I have been supplying of late is an 'old school' series regulated design that is much tighter as to output voltage. The voltage out can be changed using a different resistor pair. However if you want the pot adjustable version please let me know quickly as your package is ready to ship and I would need to swap out the PCB.
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Carl Huff

Last edited by Carl_Huff; 5th October 2018 at 06:15 PM. Reason: Spelling ... argh
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Old 5th October 2018, 07:08 PM   #1186
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
The fixed voltage reg supply that I have been supplying of late is an 'old school' series regulated design that is much tighter as to output voltage. The voltage out can be changed using a different resistor pair. However if you want the pot adjustable version please let me know quickly as your package is ready to ship and I would need to swap out the PCB.
i really appreciate Carl, i am sure the Fixed Voltage reg is very tight as to output voltage. i also prefer to have the freedom to adjust the voltage without desoldering the resistors.
Please i will really appreciate that you dispatch the package with the adjustable voltage PCB.
Thanks
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Old 5th October 2018, 07:17 PM   #1187
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
... Please i will really appreciate that you dispatch the package with the adjustable voltage PCB.
Thanks
Not a problem. I will make the swap.
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Carl Huff
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Old 5th October 2018, 07:22 PM   #1188
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
Location: Provence
Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
Not a problem. I will make the swap.
thank you
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Old 5th October 2018, 08:53 PM   #1189
Hicoco is offline Hicoco  France
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Join Date: Feb 2018
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Doug Self Preamp from Linear Audio #5
Quote:
Originally Posted by Carl_Huff View Post
What do you think of this?? Does that work for you?
https://www.diyaudio.com/forums/atta...jumpers_00-jpg


Carl, again thank for your help, i would like also check with you about this PCB and be sure that you will sent this one with 230V, yes we have also 230V/240V here in France
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Old 5th October 2018, 09:07 PM   #1190
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by Hicoco View Post
https://www.diyaudio.com/forums/atta...jumpers_00-jpg


Carl, again thank for your help, i would like also check with you about this PCB and be sure that you will sent this one with 230V, yes we have also 230V/240V here in France
Aah, okay. That will delay your order 10 to 14 days as I will need to send that out for fab. I have no problem with that as I had planned on stocking them anyway. Just note that your shipment will be delayed.
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Carl Huff
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