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Old 30th June 2010, 08:47 PM   #11
onis_uk is offline onis_uk  United Kingdom
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Primary

0v – 200v – 220v – 240v



Secondary

0 – 22volts @ 2A

0 – 12volts @ 7.5A

surely that means 240v input and cant i just use the 12v 7.5 secondary to power the amps ?
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Old 1st July 2010, 01:04 AM   #12
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Hi there Onis,

Please consider the following,

1- in my eye's torroidial transformers are ideal, as long as a good secondary stage has been implemented with a proper bridge rectifier and big buffer capacitor.
2- if you rectify AC to DC, the voltage increases, the is roughly calculable with AC X 1.4 = DC, but the rectifier also eats about 1 volt usually.

best case you find yourself a 10V ~ 11V Transformer, thats right about good, and if it has 5 A max, its plenty!

Greetings!

Arjen Helder
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Old 4th July 2010, 01:11 PM   #13
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Hi Arjen,
I suspect you missed my eMail I sent you days ago regarding your new speaker output relay board. If you donīt know who I am please PM.

I would be pleased if you would act on this issue. I disconnected the buffer amp + MK III TA2020 system meanwhile and would be happy to build up an well working system in a case soon.

Thanks
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Old 4th July 2010, 01:20 PM   #14
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Hi , O.K. I have read this meanwhile from onis_uk:
Arjen Helder Buffer V2

I am waiting till the technical issues cleared up completely.
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Old 7th July 2010, 06:39 AM   #15
Ipanema is offline Ipanema  Malaysia
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Default humming

Hi, I got the TA2020 version 2.0A and tube buffer V1.3 board. It got quite a loud low Hz hum even when volume pot is fully turned down. Does anyone have this problem? I've tried this tube buffer with other power amp, but the hum still does exist. Regards.
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Old 7th July 2010, 11:39 AM   #16
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Hi there Ipanema,

you could first of all double check your grounding for the input signal and power supply, and second of all, on the PCB nect to the potentiometer there is a via that is put there to ground the metal parts of the potmeter. you can scratch some coating away and solder a wire fron the via to the pot housing.

if you cannot solve it, you can send me a photo of the set-up and ill scan that for any connection trouble.

Greetings,

Arjen Helder
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Old 7th July 2010, 01:04 PM   #17
Ipanema is offline Ipanema  Malaysia
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Hi Arjen,

Thanks for your reply. The humm is gone after I change the 12V wall-adapter from the transformer type to SMPS type. Both are rated at 1A, 12V DC and does not comes with earth pin.

I can't find the output relay board on your ebay store. How much do you sell it?

Regards.
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Old 8th August 2010, 12:33 AM   #18
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Default Arjen is seems to be in vacation...

maybe another expericenced member can help me how to connect the relay board to the TA2020 mkIII-board

The pic here from arjen:
Curing Arjen helder amp power off pop !!!

makes me a bit unsure regarding the powersupply connection ... instead of L or R he writes Input + and - . Thatīs really confusing and seems not to be well calculated before...

BTW: Arjen seems to be in vacation because I must start here the same question after he didnīt reply to my PM message
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Old 8th August 2010, 09:32 AM   #19
onis_uk is offline onis_uk  United Kingdom
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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 !!!!
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Old 8th August 2010, 10:38 AM   #20
AP2 is offline AP2  Italy
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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.
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