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Help troubleshooting Cavalli Liquid Carbon
Help troubleshooting Cavalli Liquid Carbon
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Old 9th August 2019, 10:59 AM   #11
Nightpuma is offline Nightpuma  Norway
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Quote:
Originally Posted by Nightpuma View Post
I dont have a bench supply unfortunately.

When I unsolder the wires, the amp won't turn on.

Can I solder +16 wire to -16 and vice versa to see if the low voltage changes side?
OK, I mixed up the buttons a little bit. I can tun it on, and the reading is:

+ 16 wire = +15.8 VDC
- 16 wire = - 18VDC VDC
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Old 9th August 2019, 12:57 PM   #12
kevin gilmore is offline kevin gilmore  United States
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Quote:
Originally Posted by Nightpuma View Post

Can I solder +16 wire to -16 and vice versa to see if the low voltage changes side?
NO. does not work that way. In fact that would do a lot of damage.

You could jumper across the regulators, i.e. -16 tied to -15 and +16 tied to +15
that would tell you if the LDO's are in trouble or not.
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Old 9th August 2019, 02:29 PM   #13
Nightpuma is offline Nightpuma  Norway
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Quote:
Originally Posted by kevin gilmore View Post
NO. does not work that way. In fact that would do a lot of damage.

You could jumper across the regulators, i.e. -16 tied to -15 and +16 tied to +15
that would tell you if the LDO's are in trouble or not.
When I bypass the reg board, the amps works amp plays on both channels.

Voltage on - and + is almost equal around 16VDC.

So I suppose the conclusion is that the reg is faulty.

I think itīs to complicated for me to fix, so either I:

1. Get a new board from Avenson Audio
2. Get another board that fits.
3. Run the amp w/o reg board.

Will it be ok to run the amp on 16V for now, or should I drop it to 15V with a resistor?
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Old 9th August 2019, 05:31 PM   #14
kevin gilmore is offline kevin gilmore  United States
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what are the numbers on the 2 LDO chips?

option 1 is highly unlikely or way over priced.

option 3 is the easiest.

absolutely make sure you do not plug in or unplug headphones with the amp on even with the volume at zero.

never ever plug in both unbalanced and balanced headphones at the same time

option 4

make your own perf board with a pair of ldo regulators on it. You should be able to make something by hand using to220 parts that would fit in the case.
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Old 9th August 2019, 06:58 PM   #15
Nightpuma is offline Nightpuma  Norway
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Quote:
Originally Posted by kevin gilmore View Post
what are the numbers on the 2 LDO chips?

option 1 is highly unlikely or way over priced.

option 3 is the easiest.

absolutely make sure you do not plug in or unplug headphones with the amp on even with the volume at zero.

never ever plug in both unbalanced and balanced headphones at the same time

option 4

make your own perf board with a pair of ldo regulators on it. You should be able to make something by hand using to220 parts that would fit in the case.
I have taken some pics of the chips. Maybe you can find them. I donít know what to search for.

I will wait for the response from Avenson.

If they donít have it, making one or finding a ready made would be the options.

I like the idea of making one myself. That makes for a nice little challenge for me
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Last edited by Nightpuma; 9th August 2019 at 07:01 PM.
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Old 9th August 2019, 08:02 PM   #16
kevin gilmore is offline kevin gilmore  United States
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one is this
http://www.ti.com/lit/ds/symlink/tps7a33.pdf
the other is this
http://www.ti.com/lit/ds/symlink/tps7a47.pdf
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Old 9th August 2019, 09:43 PM   #17
Nightpuma is offline Nightpuma  Norway
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Originally Posted by kevin gilmore View Post
Thanx
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Old 9th August 2019, 09:44 PM   #18
Nightpuma is offline Nightpuma  Norway
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+15V/-15V 1A AC / DC Regulator Power Dual Supply input 15-18V UN-Assembled Kit | eBay
I could maybe use half of this

Or a couple of these:

Voltage Regulator

Last edited by Nightpuma; 9th August 2019 at 09:56 PM.
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Old 9th August 2019, 10:30 PM   #19
kevin gilmore is offline kevin gilmore  United States
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not the first one. as it clearly will not fit in the box, plus no current limit.

a pair of plus and minus regulators from the second link would definitely work.
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Old 10th August 2019, 09:57 AM   #20
Nightpuma is offline Nightpuma  Norway
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Quote:
Originally Posted by kevin gilmore View Post
not the first one. as it clearly will not fit in the box, plus no current limit.

a pair of plus and minus regulators from the second link would definitely work.
Than I will wait for response from Avenson, and if they don't have the original in stock, I will get a pair of the LDOVR regs.

And thank you so much for using your time to help me out. I am very grateful
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