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Old 10th February 2016, 08:01 PM   #1
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Default Beyerdynamic A1 clone, need some help

Hi to all,
I'm kinda new to diy electronics, only made some guitar pedals, so I need your help.

So, I bought this kit:
The Best Byerdynamic A1 Headphone Amplifier DIY Kit 4 Pairs Output Transistor | eBay
and I need some clarifications before I blow something up .
First, the pcb has markings for 2200uF capacitors but the ones included in the kit are 3300uF, what will be the difference?
And second, I have a EI transformer form a halogen lamp, rated at 20VA with about 13,5V output, can it be used to power the circuit?
If it can be used, where do I connect the circuit ground, because it only has 2 output wires.

Thanks in advance.
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Old 10th February 2016, 08:44 PM   #2
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Welcome to the forum.

The 3300uF caps will give you more filtering for the power supply, no worries there.
20VA should be plenty for this amp but what does the circuit call for as an input voltage?
Take the Speaker Voltage Test!
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Old 10th February 2016, 09:24 PM   #3
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Hi, thanks for the reply.
The seller says 13.5V would work, but the recommended is 15V to 18V.
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Old 11th February 2016, 09:22 PM   #4
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What about the grounding, the transformer does not have one.
Where does the circuit ground go in this situation?
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Old 14th February 2016, 11:15 AM   #5
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The board has a ground point hasn't it? Connect it to the case. Connect the case to your power cable input so it connects to a grounded wall socket. Or connect this yourself to a copper water pipe or a radiator in the house.. This helped me a lot since most wall sockets in my home country were not grounded..
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Old 14th February 2016, 01:53 PM   #6
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Thanks for the reply.
After some research and questions, I found out that this transformer is not suitable.
So I need one AC-0V-AC, with AC being form 15V to 18V, and the circuit ground is connected to the 0V wire of the transformer.
This is where the transformer is connected:
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