@zman, Nikosokey and Project16,
Thanks Fellas,
My USSA5 will have a unique look. I hope others will appreciate its appearance as well. One thing is for sure, ALL will enjoy the music it reproduces 😀
Thanks Fellas,
My USSA5 will have a unique look. I hope others will appreciate its appearance as well. One thing is for sure, ALL will enjoy the music it reproduces 😀
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I think i found it ,, for you my friend Do.
5002 Keystone Electronics | Mouser Greece
Test Points Circuit Board Hardware - PCB | Mouser Greece
5002 Keystone Electronics | Mouser Greece
Test Points Circuit Board Hardware - PCB | Mouser Greece
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@nikosekey,
Can you share with us what is your bias level, heatsink and ambient temperature?
Thanks
Can you share with us what is your bias level, heatsink and ambient temperature?
Thanks
@ Μeanie my pleasure ....
The dimensions of the Heatsink are 15.5cm X 27.5cm X 4cm fins.
I tested the amplifier with transformer voltages of 18 volts DC and 26.5 DC volts at ambient temperatures about 20 C. The bias level 60mv about 1.20A , Temp on heatsink with +/- 18V dc 1.2A bias about 38C. Temp on heatsink with +/- 26.5V dc 1.2A bias about 45C...
I haven't decided the voltages of the transformer since I don't know if I'll go beyond the main power supply CRC and ripple eater ...
I still haven't read any reports about any differences between CRC vs CRC with Ripple eater here in this thread ....
The dimensions of the Heatsink are 15.5cm X 27.5cm X 4cm fins.
I tested the amplifier with transformer voltages of 18 volts DC and 26.5 DC volts at ambient temperatures about 20 C. The bias level 60mv about 1.20A , Temp on heatsink with +/- 18V dc 1.2A bias about 38C. Temp on heatsink with +/- 26.5V dc 1.2A bias about 45C...
I haven't decided the voltages of the transformer since I don't know if I'll go beyond the main power supply CRC and ripple eater ...
I still haven't read any reports about any differences between CRC vs CRC with Ripple eater here in this thread ....
Attachments
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Levendi Niko,
have you got Gerber files or a black and white image for the ripple eater PCB?
Regards
Harry
have you got Gerber files or a black and white image for the ripple eater PCB?
Regards
Harry
Ripple Eater some measurments .....Oh amazing .....
Attachments
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Ηi
i have some explanations about my above measurements ... my main power supply
CRC consists of two 4.700uf caps per rail with a trafo 2x15 V 200VA, bias of the amp about 1.25A , i measure with my old scope 0.2V /Div about 850mv ripple pk-pk as the photo simulation ... after the Ripple eater scope 5mv /Div looks about 2-3 mv.... the other foto of my scope is with magnifier knob pull out X10 ..
Also i listening music with and without ripple eater ....mmm this amp promise me very good acoustical results i prefer to write my impresions with a good CRC over the amp...
i have some explanations about my above measurements ... my main power supply
CRC consists of two 4.700uf caps per rail with a trafo 2x15 V 200VA, bias of the amp about 1.25A , i measure with my old scope 0.2V /Div about 850mv ripple pk-pk as the photo simulation ... after the Ripple eater scope 5mv /Div looks about 2-3 mv.... the other foto of my scope is with magnifier knob pull out X10 ..
Also i listening music with and without ripple eater ....mmm this amp promise me very good acoustical results i prefer to write my impresions with a good CRC over the amp...
Attachments
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After a year, since I first contacted FAB for his PCB and awesome build manual.
I finally completed this fantastic power amp. Along the way, I kept changing power supply during bench testings, and I decided to use twin SLB, and build it as a twin monobloc in a compact chassis, and SSR for speaker protection.
It took about an hour to reach full working temperature of about 53degC, its slightly high on this compact chassis, it was 48degC on a Conrad heatsink 350x150x50mm.,with an ambient of about 22degC. Bias was 1.35A on a rail of +/- 23.8Vdc.
So for anyone that is going to build this amp, my advice would be, to first read FAB's manual front to back a few time, make sure you know what is the next step beforehand, it will save you from any headache. It is a comprehensive manual written in a systematic way of approach. As long as you follow the steps, you can't go wrong!
Time for some serious listening... Thanks, Fab!
I finally completed this fantastic power amp. Along the way, I kept changing power supply during bench testings, and I decided to use twin SLB, and build it as a twin monobloc in a compact chassis, and SSR for speaker protection.
It took about an hour to reach full working temperature of about 53degC, its slightly high on this compact chassis, it was 48degC on a Conrad heatsink 350x150x50mm.,with an ambient of about 22degC. Bias was 1.35A on a rail of +/- 23.8Vdc.
So for anyone that is going to build this amp, my advice would be, to first read FAB's manual front to back a few time, make sure you know what is the next step beforehand, it will save you from any headache. It is a comprehensive manual written in a systematic way of approach. As long as you follow the steps, you can't go wrong!
Time for some serious listening... Thanks, Fab!
An externally hosted image should be here but it was not working when we last tested it.
Hi Meanie
Which is the secondaries voltages to get 23.8V output on SLB , and your currently dimensions of your heatsink?
Which is the secondaries voltages to get 23.8V output on SLB , and your currently dimensions of your heatsink?
@nikosokey,
I got my transformer from Altronics(Melbourne), they are 18Vac.
However with our local main supply at 235Vac most of the time, I got nearly 20Vac at the secondary, after the SLB, I got from 23.6~23.8Vdc
I did try the recommended 22Vac transformer, but I can't install them(500VA each) in my compact chassis, maybe next bigger chassis...
Current heatsink is 300x180x50mm. I still prefers heatsinks by Conrad Engineering, they are the perfect size for 25W Class A amp applications.
I got my transformer from Altronics(Melbourne), they are 18Vac.
However with our local main supply at 235Vac most of the time, I got nearly 20Vac at the secondary, after the SLB, I got from 23.6~23.8Vdc
I did try the recommended 22Vac transformer, but I can't install them(500VA each) in my compact chassis, maybe next bigger chassis...
Current heatsink is 300x180x50mm. I still prefers heatsinks by Conrad Engineering, they are the perfect size for 25W Class A amp applications.