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Old 31st March 2013, 12:02 PM   #151
Dimitris
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Can you please tell us a bit more on how are you using the second psu?
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Old 31st March 2013, 06:52 PM   #152
pchw is offline pchw  United States
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The second PSU is a 5V reg, based on Martin's
Using 3-pin regulators off-piste: part 4

It is for the separate 5V supply. You can see it soldered to one of L4's (removed) pads that is connected to L5. Ground is soldered to neaby ground plane. Another convenient 5V soldering pad is the V4 test point. FWIW, there are 2 9-0-9 transformers in the ATX PS case.

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Old 4th April 2013, 07:29 PM   #153
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For my custom model I'd like to use a power entry connector with a built in switch. The idea is that switch will control the power to the digital circuitry, besically keeping that on all the time. A second switch on the front panel will control power to the mechanism motors and the display. My experience tells me keeping the digital stuff cooking all the time makes for better sound.

What is the feeling on using a power inlet with built in filtering? Something like this

15CUFE1 - TE CONNECTIVITY / CORCOM - POWER ENTRY MODULE, MALE, 15A | Newark
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Old 4th April 2013, 10:17 PM   #154
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I ve been using schafner ones for quite some time with excellent results. The one that has dual everything, including fuses.

FN389B-6-21 Schaffner | Mouser
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Old 4th April 2013, 11:00 PM   #155
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Mmm, looks nice.

I wonder if using a regular inlet and hanging a really good cap like a Mundorf or V-Cap on the primary side would be better.
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Old 24th April 2013, 06:21 PM   #156
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Tibi, with respect to my plan of having separate 8V and 5V supplies, does the 8V feed anything besides the mechanism? I'm trying to decide if I want to keep the 8V and 5V powered on all the time, and add a switch for the display only, or add that "run time" switch for the entire 8V feed and display. If the 8V does not power anything on the main PCB that "needs" to be on all the time then I'd make that part of the switch to throw when wanting to play a CD.
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Old 24th April 2013, 06:38 PM   #157
tvicol is offline tvicol  Romania
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Tony,

8V power directly only LA6541.

Regards,
Tibi
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Old 24th April 2013, 11:34 PM   #158
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Quote:
Originally Posted by tvicol View Post
Tony,

8V power directly only LA6541.

Regards,
Tibi
Thanks Tibi. I guess then it will be okay to keep the 8V feed as separately switched, but I think I will do it at the 8V output of the PS board, and not at the AC input. That way at least the PS will remain at a quiescent operational state.
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Old 27th April 2013, 01:49 AM   #159
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If I want to keep the buttons active, but cut power to the display, how would I do it?
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Old 27th April 2013, 06:36 AM   #160
tvicol is offline tvicol  Romania
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Normally if you put a switch on LC78601 pin 40 - Vlcd1. This should allow you to switch on/off internal lcd mux.

Regards,
tibi

Last edited by tvicol; 27th April 2013 at 06:54 AM.
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