Hi,
This is another K8060 DIY amp from Velleman. Yes, I've read all the good advise here about this amp. 😀
However I had already the components before I read the experiences on this forum and I must say they are true.🙂
The K8060 is a very delicate lady and if you do not handle this amp properly you will have to change the TIP's a lot, especially in my situation. I have a Denon CEOL RCD-N9 and am not satisfied with the class D amp in it. This amp cannot drive my ASW Genius 300 speaker (4 Ohm) properly. Another problem is that is has not a proper output for a power amplifier and therefore I use the headphone output. With the 0.6V RMS sensitivity of the K8060 unit you can overload the input very easy. Which I did. The next step is to put the pre amp in front of it with with an attenuation of 11. So 5 V will be downsized to 0.450 V. A save value.
At the moment the power rails are 40 V, Transformer 2 x 30 V AC. That is too much for the amp with a 4 Ohm load. So I will lower the power rails to 28 ~ 30 V. by putting 2 x (10 x BY500) diodes in series and anti parallel in the AC power lines for each amp. A bit pity but safety first. Don't want to burn more Tip's or fry my speakers although there is an K4700 speaker protection unit installed.😉
The units are mounted in a wooden casing and I found out that this is very sensitive for hum and noise. If I put the unit to close to the CEOL you hear the hum. A meter beside the CEOL and the amp is dead silent.
At first I had the inputs, outputs and mains on the back of the amp. You can still see the holes. But that gave a hum and noise. After reading the information about ground loops I decided to rearrange the wiring. Now the mains wiring are on the back and the in- and outputs are on the front. The amp is dead silent now.
The next step is to assemble the pre-amp. Also a Velleman unit K8084. This is not all state of the art but it will suffice. The point is that you have fun and see a positive turn towards a better sound.
I had already a listing moment with my iPhone as source and it sound good, better than the dull D-class amp of the CEOL. There is nice bass, the mid and high are clearer.
Marcel
This is another K8060 DIY amp from Velleman. Yes, I've read all the good advise here about this amp. 😀
However I had already the components before I read the experiences on this forum and I must say they are true.🙂
The K8060 is a very delicate lady and if you do not handle this amp properly you will have to change the TIP's a lot, especially in my situation. I have a Denon CEOL RCD-N9 and am not satisfied with the class D amp in it. This amp cannot drive my ASW Genius 300 speaker (4 Ohm) properly. Another problem is that is has not a proper output for a power amplifier and therefore I use the headphone output. With the 0.6V RMS sensitivity of the K8060 unit you can overload the input very easy. Which I did. The next step is to put the pre amp in front of it with with an attenuation of 11. So 5 V will be downsized to 0.450 V. A save value.
At the moment the power rails are 40 V, Transformer 2 x 30 V AC. That is too much for the amp with a 4 Ohm load. So I will lower the power rails to 28 ~ 30 V. by putting 2 x (10 x BY500) diodes in series and anti parallel in the AC power lines for each amp. A bit pity but safety first. Don't want to burn more Tip's or fry my speakers although there is an K4700 speaker protection unit installed.😉
The units are mounted in a wooden casing and I found out that this is very sensitive for hum and noise. If I put the unit to close to the CEOL you hear the hum. A meter beside the CEOL and the amp is dead silent.
At first I had the inputs, outputs and mains on the back of the amp. You can still see the holes. But that gave a hum and noise. After reading the information about ground loops I decided to rearrange the wiring. Now the mains wiring are on the back and the in- and outputs are on the front. The amp is dead silent now.
The next step is to assemble the pre-amp. Also a Velleman unit K8084. This is not all state of the art but it will suffice. The point is that you have fun and see a positive turn towards a better sound.
I had already a listing moment with my iPhone as source and it sound good, better than the dull D-class amp of the CEOL. There is nice bass, the mid and high are clearer.
Marcel
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