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Old 8th August 2010, 02:19 PM   #21
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Originally Posted by onis_uk View Post
im sorry but i fail to see how that picture is confusing? its rather basic ... 12v to power the board and then the relays cut the + speakers wires !!!!
O.K. thanks, I was more confused about the 24 VDC writing on the relay board.
So I made my thoughts how to feed the relay board with 24VDC when I take 12 V from the SMPS ... ? Couldnīt see 2 x 12 V source which were connected in series. Maybe the 24 VDC writing refers to a DC/DC transformation closed to it

That and the issue with IN+ and IN- while both are referring to L+ and R+ ... Would this really not confuse a greenhorn like me ?
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Old 8th August 2010, 02:26 PM   #22
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Originally Posted by AP2 View Post
Hi All,
I think these amps that can go low voltage / battery is better to use a small relay directly to the output signal of the preamp (use a switch to disable when gnd). this is a more elegant but requires a simple circuit lm339. .. or brutal connection of the small relay at switch (ON-OFF VCC) with a small constant R-C.

Regards

P.S. it is possible use a FET for switch to gnd signal from preamp-out.
Hi AP2,
in fact I want to check up a 12 V SLA battery. Which solution you choosed to solve this problem ? Could you explain me which parts I need ? Maybe via drawing or design ? But not complicated. I am to be confused very easily
Thanks till now
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Old 9th August 2010, 02:08 AM   #23
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Thats indeed it, 12V to the power jack ( up to 15V is fine also ) and the positive speaker wires run true the relays.

putting it at the input side doesn't work, because then the capacitor of the pre-amp will equalize it self to the input capacitor of the amplifier and that also causes a pop.

greetings,

Arjen
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Always check the power supply... and my spelling...
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Old 10th August 2010, 10:33 AM   #24
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Hi,
It..work without "pop"

Regards
Attached Images
File Type: jpg Relay.jpg (8.0 KB, 211 views)
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Old 10th August 2010, 03:37 PM   #25
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Hi AP2,

I will first check up Arjenīs relay board. No need to build up another solution at moment ... I would also say that placing the circuit between pre and power is not so good than between power and speakers (just regarding sound influence and not safety issues). Relays I knew before were always acting closed to the speakers ... thanks anyway

Last edited by TheDealer; 10th August 2010 at 03:39 PM.
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Old 12th August 2010, 11:55 PM   #26
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I donīt know what is the reason but Arjens relay board doesnīt work well. I also donīt want to make his projects bad.

I think I have connected all wires right. The problem is that you have to switch your CD-Player ON before supplying the TA2020 board + buffer amp with power. Otherwise when you power both and after then you switch ON the Player you still get this loud bump out from the speakers. UUuuHHH better than no solution at least ...
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Old 18th August 2010, 08:28 PM   #27
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Hi guys,

I have obtained a pair of TK2050 boards from Arjen. I had a nasty pop the first time I powered down the amp because I did not adjust the multi-turn pot on the board. You need to adjust it for exactly 0 DC offset. (using a sensitive voltmeter)

The dealer : Try and power down all your gear simultaneously(with a single flick of a switch) after you finish listening. Same goes for when you power up. That way I guess you wont have any start up or power down problems.

Hope that helps.
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Old 18th August 2010, 09:34 PM   #28
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I solved this nasty pop in changing to 2 separate powersupplies. A battery for the buffer amp and a smps for the power board. But I have though that still 2 open issues to be cleared. Maybe you can help:
Arjenīs TA2020 board: 1 channel into amp 2 channels on spekaers - WHY ?
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Old 19th August 2010, 12:51 AM   #29
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Edit: things became meanwhile better.
One battery + powerboard + keeping order and reduce the cables = VERY GOOD RESULT !
Hope to integrate the tube buffer amp soon also well matched into system
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Old 19th August 2010, 06:38 AM   #30
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Hi,

What are your listening impressions of the buffer amp compared to any of your other pre-amps ? I am currently using an Oatley K272A mini valve preamp running on a 12V battery as well.

Cheers,
Dinesh
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