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Old 1st January 2011, 09:46 PM   #1
Boscoe is offline Boscoe  United Kingdom
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Default Thoughts on the velleman K8060?

Just wondered what people thought of this amp, I have built on once but broke it and never got to listen to it. They are cheap and are good quality but are they that good?

Velleman nv

I belive this is the schematic:

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Old 2nd January 2011, 12:15 AM   #2
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Not really , no current sources , low PSRR. Darlington OPS shunted by 680pF ... questionable stability. A similar amp with a current source and a true 2 stage emitter follower output scheme would be miles ahead in durability and sound quality. (below) is a similar but much more refined amp , it's sonics would overwhelm the velleman by a VERY wide margin at the cost of 3-4 more devices (cheap). The Velleman is more of a "student" amp , not really Hi-Fi .

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Old 2nd January 2011, 09:31 AM   #3
jaycee is offline jaycee  United Kingdom
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It's a typical low cost kit amp, using cheap darlington outputs. It'll work - thats about the best you can say about it.
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Old 2nd January 2011, 10:40 AM   #4
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It's about the same circuit as a circuit from an 80's elektor catalogue.
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Old 2nd January 2011, 11:51 AM   #5
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read this problem: project vellman!!
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Old 2nd January 2011, 11:59 AM   #6
jaycee is offline jaycee  United Kingdom
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The person in that thread was trying to run the amp from higher supply voltages. on 35V supplies (using a 2x25v transformer) this circuit is OK - this is typical supply voltage, while Velleman show 40V supplies this would be the unloaded voltage, and will soon sag under load.
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Old 19th February 2013, 06:36 PM   #7
JMFahey is offline JMFahey  Argentina
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I run a pair of TIP142/147 all day long, with +/-38 to +/-40V supplies, into 4 ohms with no problems whatsoever.
Mind you, they are Guitar/Bass/PA amps, which get a beating.
Yes, supply voltages sag a lot under heavy load.
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Old 15th October 2013, 08:51 PM   #8
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Default Good amplifier

I have built this amplifier, and it works well, no problem with stability or distortion.
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Old 8th April 2014, 08:37 AM   #9
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Originally Posted by arnelofgren View Post
I have built this amplifier, and it works well, no problem with stability or distortion
Hi ! very interesting minimalist amp
May i ask about its sound ? what are you using as preamp ?
Thanks and regards,
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Old 10th April 2014, 05:15 PM   #10
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the sound of transistors that DO NOT provide their audio specs can and will be horrible
Then again you will never be able to source and reliable TIP 142-147 and the circuit suffers from a number of problems

It will stand a chance with far lower rails but still its a ticking bomb All kits produced on the above circuit and even more sophisticated with VI limiters eventually find their way to the creator

Keep away!!!! When small (60Watt ) powerful, plenty of kick, surprisingly clean sound ? check Dx amplifier or a P3A at this ratio of part count you will find nothing better in class AB add to that all parts available and loads of support !!!

Kind regards
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