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The BA-3 as preamp build guide
The BA-3 as preamp build guide
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Old 4th October 2021, 07:58 PM   #2201
ScottyBe is offline ScottyBe  United States
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The BA-3 as preamp build guide
Thank you guys. Much appreciated
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Old 10th October 2021, 06:20 AM   #2202
Chiptech is offline Chiptech  United States
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The BA-3 as preamp build guide
Ok. I've worked my way thru forum, made some progress pulling things together.

I've mapped out the wiring for power and I'm hoping I have it sorted correctly.

Appreciate a review and comments.
Attached Images
File Type: jpg BA-3 in process.jpg (161.0 KB, 230 views)
File Type: png BA-3 Wiring Guide 1.png (669.0 KB, 227 views)
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Old 10th October 2021, 07:28 AM   #2203
Ben Mah is offline Ben Mah  Canada
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The BA-3 as preamp build guide
I am not familiar with the boards so I cannot comment on their connections.

However your fuse is wired incorrectly. You have it parallel to the AC. It should be in series.

Wire should be from hot pin of AC socket to end of fuse holder. Then another wire from side pin of fuse holder to AC power switch. No part of the fuse should be connected to the neutral pin of the AC socket.
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Old 10th October 2021, 07:34 AM   #2204
cubicincher is offline cubicincher  Germany
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Default to Chiptech #2202

Hello Chiptech;


i made some corrections:


-always conect Earth in to your chassis/case of the amp!
-in your drawing hot and neutral at the AC-inlet are connected over the fuse - don't do that please!

-your hot at the AC-inlet should go to the fuse and from the other contact at the fuseholder to the AC-switch
-you also need a contact from the ground of your symmetrical PSU to your star ground/ earthground

This is what I saw immediately. Perhaps others can chime in and throw a second or third pair of eyes on it.
Cheers
Dirk
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File Type: jpg BA-3 Wiring Guide 2.jpg (134.3 KB, 222 views)
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Old 10th October 2021, 07:35 AM   #2205
cubicincher is offline cubicincher  Germany
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BenMah was faster!


Cheers
Dirk
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Old 10th October 2021, 07:56 AM   #2206
Ben Mah is offline Ben Mah  Canada
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The BA-3 as preamp build guide
You were probably busy making changes to the picture.
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Old 10th October 2021, 09:31 PM   #2207
Chiptech is offline Chiptech  United States
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Join Date: Apr 2019
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The BA-3 as preamp build guide
Quote:
Originally Posted by Ben Mah View Post
I am not familiar with the boards so I cannot comment on their connections.

However your fuse is wired incorrectly. You have it parallel to the AC. It should be in series.

Wire should be from hot pin of AC socket to end of fuse holder. Then another wire from side pin of fuse holder to AC power switch. No part of the fuse should be connected to the neutral pin of the AC socket.

Ben,

Thanks for the clarification/correction. This is the first time I've used a separate fuse and though I searched for explanations, I was unable to unravel it myself. But I did try.
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Old 10th October 2021, 10:04 PM   #2208
Ben Mah is offline Ben Mah  Canada
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The BA-3 as preamp build guide
Better to be safe.

Here is an example that you are probably familiar with - the typical FW amplifier power supply, with fuse:
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File Type: jpg PSUschematic.jpg (70.0 KB, 182 views)
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Old 10th October 2021, 10:07 PM   #2209
Chiptech is offline Chiptech  United States
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Join Date: Apr 2019
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The BA-3 as preamp build guide
Quote:
Originally Posted by cubicincher View Post
Hello Chiptech;


i made some corrections:


-always conect Earth in to your chassis/case of the amp!
-in your drawing hot and neutral at the AC-inlet are connected over the fuse - don't do that please!

-your hot at the AC-inlet should go to the fuse and from the other contact at the fuseholder to the AC-switch
-you also need a contact from the ground of your symmetrical PSU to your star ground/ earthground

This is what I saw immediately. Perhaps others can chime in and throw a second or third pair of eyes on it.
Cheers
Dirk
Dirk,

Thanks very much for the corrections. I have undated my chart. You indicate that I need two places where I ground to the chassis - I'm not clear on that?

thanks,
Attached Images
File Type: png BA-3 Wiring Guide 1 Revised.png (681.0 KB, 180 views)
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Old 10th October 2021, 10:25 PM   #2210
Chiptech is offline Chiptech  United States
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Join Date: Apr 2019
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The BA-3 as preamp build guide
Quote:
Originally Posted by Ben Mah View Post
Better to be safe.

Here is an example that you are probably familiar with - the typical FW amplifier power supply, with fuse:
Yep. Now that I know what to look for, it makes perfect sense.
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