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Old 18th August 2011, 05:48 AM   #11
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tnx for the enlightment, can you help me how to know the actual amp. rating value counterpart between torroidal and ei transformer eg. what will be the counterpart for 160va torroid.., would it be 6amp ei transformer? coz torroidal are hard to obtain or to expensive here in the philippines
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Old 18th August 2011, 12:45 PM   #12
sreten is offline sreten  United Kingdom
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Hi,

The transformer rating depends on what rail voltages you use and
that depends to an extent on the efficiency of the heatsinking fitted.

I'd fit around 100VA, toroidal or EI. For reliability I'd run it off 25-0-25VAC.
But up 30-0-30V is possible, for 8 ohms, 25-0-25V for 4 ohms IMO.

rgds, sreten.

Its a case of RTFM : http://www.vellemanprojects.eu/downl...vm100_rev1.pdf
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Old 19th August 2011, 12:45 PM   #13
timpert is offline timpert  Netherlands
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Most probably, you have gotten this manual with the kit:

http://www.velleman.eu/downloads/0/i...k8060_rev1.pdf

If the info in this manual is insufficient for you to hook up the transformer, then please, do not continue your work on this amplifier without the direct help of someone who knows what he or she is doing. And forget everything that has been said in this thread about alternative power supplies for the time being, just stick with the manufacturer's recommendation. Velleman indicates a level 5 for this kit, their most advanced level. Considering this, the nature of your questions worries me a bit...
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Old 19th August 2011, 01:11 PM   #14
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I HAVE CONSTRUCTED THIS AMP USING A TOROIDAL TRANS 2X30V 4,3A WITH SUCCESS. YOU CAN USE ALSO COMMON TRANS WITH THE SAME SECONDARY VALUE.2X25 V IS THE LOWER VALUE.BUT KEEP IN MIND TO HAVE 4.3A AT LEAST
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Old 19th August 2011, 03:52 PM   #15
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In case it did not come across clearly, you should also use a separate transformer for each board. E.g. two 25-0-25 160VA transformers for stereo.

You will have trouble to manage signal ground otherwise.
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