Hello!
I'm happy to report that our aleph 5 project is making very good progress indeed. We are three guys building six monoblocks in total.
We finished soldering two days ago and tested them without fets first. Another post here in the forum told us that connecting the common point of C6, C8 and R7 to earth would allow us to measure as if the fets were there. All six pcb's measured fine.Yesterday we connected fets to one pcb and gradually applied voltage. A tense moment
But everything worked fine, including all the measurements. Now we had the courage to try some music, and music there was! Sweet undistorted music, although the labspeaker certainly has seen better days. After this success we hooked up our psu. Voltage on the rails was 41,2V. This is unconnected. Another tense moment as we connected everything and applied power... A slight hum from the toroid, and then silence. The toroid hum fades away and the speaker is dead silent. Nice!
Measuring R14 and Q5 gave us 5,12V. A bit higher than what the service manual suggests but is a result of the higher rail voltage? Z5 read 9,0V. Dc on the output was 12mV and ripple from the psu 40mV. IRF9610 are matched but IRFP240 aren't. This being a test run after all.
Hopefully the measurements will stay the same after averything is assembled.
A thanks to Mr. Pass for his designs and support to diy'ers. And also to this forum of course.
Eystein.
I'm happy to report that our aleph 5 project is making very good progress indeed. We are three guys building six monoblocks in total.
We finished soldering two days ago and tested them without fets first. Another post here in the forum told us that connecting the common point of C6, C8 and R7 to earth would allow us to measure as if the fets were there. All six pcb's measured fine.Yesterday we connected fets to one pcb and gradually applied voltage. A tense moment
But everything worked fine, including all the measurements. Now we had the courage to try some music, and music there was! Sweet undistorted music, although the labspeaker certainly has seen better days. After this success we hooked up our psu. Voltage on the rails was 41,2V. This is unconnected. Another tense moment as we connected everything and applied power... A slight hum from the toroid, and then silence. The toroid hum fades away and the speaker is dead silent. Nice! Measuring R14 and Q5 gave us 5,12V. A bit higher than what the service manual suggests but is a result of the higher rail voltage? Z5 read 9,0V. Dc on the output was 12mV and ripple from the psu 40mV. IRF9610 are matched but IRFP240 aren't. This being a test run after all.
Hopefully the measurements will stay the same after averything is assembled.
A thanks to Mr. Pass for his designs and support to diy'ers. And also to this forum of course.
Eystein.
hello
your radiators are MF30-2F-151.5 Conrad ? are they ?
you put one by channel of them?
if the answer is yes, be carefull, dissipation is not sufficient !
if the answer is no, it's all good...
for 36v and bias 1.9A, radiators 300x225x50 + 150x225x40 are not sufficient, for one channel
Delta T = 40°C
I use fan...120mm,12V / 7V
Phill
your radiators are MF30-2F-151.5 Conrad ? are they ?
you put one by channel of them?
if the answer is yes, be carefull, dissipation is not sufficient !
if the answer is no, it's all good...
for 36v and bias 1.9A, radiators 300x225x50 + 150x225x40 are not sufficient, for one channel
Delta T = 40°CI use fan...120mm,12V / 7V
Phill
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