Farther process,testing using +/-35v.
Two 18R/10W resistors instead of fuses.
Input shorted.
Out is open,no load.
Underbiased. 159mV throu 18ohm/10w.
Offset =5mV I think because Vzener=10v still not 12v.
Amplifier is rock stable again!
Two 18R/10W resistors instead of fuses.
Input shorted.
Out is open,no load.
Underbiased. 159mV throu 18ohm/10w.
Offset =5mV I think because Vzener=10v still not 12v.
Amplifier is rock stable again!
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+/-35v,no protective resistors,fuses in situ.
Bias adjusted for 13mV/0.22ohm=0.059A or 59mA.
Still no smoke,no smell.
I think that is time for cheap speakers connection.
I will connect in series with 10.000uf cap.Yes i will try to keep cheap speakers safe for other amplifiers checking!
Next step,using a pair of more expencive speakers....with caps again.
Finall step,+/-45v.
Stay tuned!
Bias adjusted for 13mV/0.22ohm=0.059A or 59mA.
Still no smoke,no smell.
I think that is time for cheap speakers connection.
I will connect in series with 10.000uf cap.Yes i will try to keep cheap speakers safe for other amplifiers checking!
Next step,using a pair of more expencive speakers....with caps again.
Finall step,+/-45v.
Stay tuned!
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If I want to build this amp. Does somebody (preferably in EU), I am in Denmark) have spare PCB´s I can buy. I am interested in using two pairs of output mosfets, since my powersupply will probably end up, around +/- 45-50VDC.
Yes,I don't afford more destroyed speakers.💣
Singing in stereo!
Please do not ask for impressions,wait the for the next step😉
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Well that is good 👍
Could be a long wait because you'll probably just want to keep listening to it......
🙂
Final test.+/-45v.
Yes,it is rock stable again.
I want to mention that it isn't a good option to use a lower voltage power supply than +/-45v.
If you will use a lower voltage like +/-35v you will expect high distortion playing near to clip levels.
Yes,it is rock stable again.
I want to mention that it isn't a good option to use a lower voltage power supply than +/-45v.
If you will use a lower voltage like +/-35v you will expect high distortion playing near to clip levels.
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You should be able to get around 35 to 40 watts rms into 8 ohm on the lower supply.
Pleased to hear it's all good so far 🙂
Pleased to hear it's all good so far 🙂
Hi Mooly next will become THD measurements.
I like a complete test!
In the meantime I will prepare new speakers.
The Asathor published here in DIY.
https://www.diyaudio.com/community/threads/asathor-a-jbl-4367-clone.367215/page-20#post-7175826
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👍 OK then.
We're just all waiting for you to listen to it and go OH WOW 😀 😀 😀
We're just all waiting for you to listen to it and go OH WOW 😀 😀 😀
Is that negative base edge oscillation in #1,313 last picture (input 560mV clip) normally expected?
Hi salas,this is my question too.
In any case I must clarify that I need to repeat this measurement connecting a thiele circuit .
I have to repeat this measurement because no thiele circuit was used.
