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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th March 2010, 05:17 PM   #1
Obe1 is offline Obe1  United States
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Default Helder MKII TA2020 Amp PSU Wiring

Hello All,

I just purchased one of Arjen Helder's MKII TA2020 amplifiers and the associated DC power supply. Arjen includes a SPST power switch with an internal LED. I assume this switch is to control DC power into the amplifier board, so I think it makes sense to add my own power switch to the AC mains as well (ahead of the PSU). In fact, I'm not sure why I need Arjen's power switch at all, if I provide my own power switch on the AC mains.

The attached sketch is my attempt to guess how the power circuit should look. Any feedback or suggestions on how best to wire-up one of Arjen's amplifiers is most welcome.

Best regards,

Obe1
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File Type: jpg TA2020_PSU_Wiring_v102.jpg (152.0 KB, 789 views)
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Old 6th March 2010, 03:38 PM   #2
onis_uk is offline onis_uk  United Kingdom
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looks ok to me !
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Old 6th March 2010, 05:49 PM   #3
audi0 is offline audi0  Australia
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Default resistor

Don't forget that you will need a resistor on the LED! The value varies a bit depending on the LED colour, forward current and typical voltage.
Resistor value = source voltage - LED operating voltage / by the LED forward current.
eg. 12 - 2.1 = 9.9 / by 30 = .33 or 330 Ohms
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Old 6th March 2010, 05:52 PM   #4
Obe1 is offline Obe1  United States
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Hi onis,

It took several days, but I just got an email back from Arjen that my connection digram would work. Unfortunatly, he didn't offer any thoughts on how to make it better. I guess I'll just have to wait for the goods to arrive from China and then play around a bit.

Thanks and take care,

Obe1
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Old 6th March 2010, 05:55 PM   #5
Obe1 is offline Obe1  United States
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Hello Audi0,

Yes. That's a good point. I'll run some test once it arrives, as I've seen some of these illuminated switches have their own internal dropping resistor.

Thanks,

Obe1
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Old 6th March 2010, 06:04 PM   #6
audi0 is offline audi0  Australia
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Yeah, sorry I didn't see the illuminated switch in the picture Why would you want to switch it twice? I would think that the AC switch would be sufficient
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Old 6th March 2010, 06:27 PM   #7
Obe1 is offline Obe1  United States
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Hi audi0,

Well, if you read my original post, I had the exact same question. On one hand just switching the AC on & off seems adequate, yet Arjen went to the trouble of including a DC switch, so maybe it has some value. Perhaps it helps minimize "thumping" your speakers during power ups or downs.

Thanks,

Obe1
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Old 6th March 2010, 06:37 PM   #8
audi0 is offline audi0  Australia
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Some of us run our amps off of batteries, on one of my systems I use a 12v 7.2Ah SLA supply , the switch could be employed in such a case.
The SMPS could be left running and you could switch the DC?
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Old 16th March 2010, 03:07 PM   #9
Obe1 is offline Obe1  United States
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The amplifier and power supply I ordered from Arjen (just 2 weeks ago) arrived yesterday. I ran some tests on the illuminated rocker switch and discovered that the lamp is a neon bulb and not an LED as illustrated in my sketch in post #1. As such, this lamp will need a lot more than 12Vdc to illuminate and so this switch is better suited for control & indication of AC mains power.
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Old 7th June 2011, 03:22 PM   #10
gychang is offline gychang  United States
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Quote:
Originally Posted by Obe1 View Post
The amplifier and power supply I ordered from Arjen (just 2 weeks ago) arrived yesterday. I ran some tests on the illuminated rocker switch and discovered that the lamp is a neon bulb and not an LED as illustrated in my sketch in post #1. As such, this lamp will need a lot more than 12Vdc to illuminate and so this switch is better suited for control & indication of AC mains power.
realize this is an old thread, I have the same board and considering it putting it all together.

How does it sound?, any difficulties in getting it all connected?, will likely add pot/volume and 2 way RCA input selector.
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Good sound from Davis, CA
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