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200W MOSFET CFA amp
200W MOSFET CFA amp
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Old 15th February 2018, 09:34 AM   #1251
Tesla Audio is offline Tesla Audio  Croatia
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Damire
good question. I'm not sure at the moment. Maybe to bring separate full audio signal before it is splitted by crossover.
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Old 15th February 2018, 12:07 PM   #1252
Tournesol is offline Tournesol  Belgium
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Damire
good question. I'm not sure at the moment. Maybe to bring separate full audio signal before it is splitted by crossover.
You can set it as a peak meter.
attached, the idea.
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File Type: jpg peak-m.JPG (24.3 KB, 636 views)
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Old 15th February 2018, 03:32 PM   #1253
Krisfr is offline Krisfr  United States
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Krisfr
when I said analog VU meter it means analog instrument not digital. Like in this photo. I have also idea to put LCD display in case that I will not be satisfied with analog.
Total cost Alu material + water cut is 150 Eur for 2 cases. Case is big and robust.

Look at this if you like to see what can be done. Again very beautiful work and soon to be listening. Thanks

YouTube
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Old 15th February 2018, 04:09 PM   #1254
Tournesol is offline Tournesol  Belgium
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You can set it as a peak meter.
attached, the idea.
And, if you are afraid of a non linear little load at your loudspeaker's output:
R1&R2 has to be set at the limit of conduction (the needle of the vu meter just moving at the limit you can see ;-)
The 4.7µF fasten the measurement of the peaks, while the 22µ slow the decrease .
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Old 15th February 2018, 06:35 PM   #1255
Tesla Audio is offline Tesla Audio  Croatia
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Tournesol
For what kind instrument is suitable this schematic. I have 100 uA meter. Idea was to buy soldered modul from ebay.
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Old 15th February 2018, 10:51 PM   #1256
Tournesol is offline Tournesol  Belgium
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Originally Posted by Tesla Audio View Post
Tournesol
For what kind instrument is suitable this schematic. I have 100 uA meter. Idea was to buy soldered modul from ebay.
It will be OK. You can adjust the bridge values that load the amps outputs to adjust the sensitivities. First with a sin at full amp power to get, by example +3dB on continuous mode. On each amp, because your meter will always show the highest level of the three.
Then, with the amp output at -3dB from full power, adjust, if needed the value of the 4.7µ in order the meter do not goes over +1dB when you put the sin signal from off to on.
A pure vu meter will never indicate something useful with musical transients. And what you want is to be sure you dont bring any amp to clip, right ?
2n2222 will be perfect for transistors.
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Last edited by Tournesol; 15th February 2018 at 10:55 PM.
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Old 18th February 2018, 03:36 AM   #1257
fredlock is offline fredlock  United States
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Hi Damir,

Do you have available board to sell? How much is it?

Thanks,

Fred
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Old 18th February 2018, 05:21 AM   #1258
dadod is offline dadod  Croatia
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Hi Damir,

Do you have available board to sell? How much is it?

Thanks,

Fred
Hi Fred,
I have four more 200W boards 46 EUR each but no any feedback small boards (included in the price). I will order more those small boards but it will take time (Chines New Year). Is this OK with you to wait?
BR Damir
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Old 8th March 2018, 08:13 AM   #1259
dadod is offline dadod  Croatia
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Any progres in building 200W version?
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Old 2nd April 2018, 11:25 AM   #1260
vitalica is offline vitalica  Europe
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Some time ago I had the first auditions with the Dado GW MK3 preamp which I was very surprised at, how well it sounded.
Last night I did an audition with amp Dado 200 MOSFET amp and GW MK3 preamp.
What can I say ... It's so good that I stayed until late at night to listen.
It impresses you all - crystalline voices, very beautiful and articulated bass (even at low volume), very silent. Having a lower voltage (+ _45V) and a generous heatsinks, I set a 300mA bias on the MOSFET. The sound was special. I will come back with pictures later, this amp deserves to be put in the beautiful case.
A question
Would it be a win if I put 2SJ201 / 2SK1530 (instead of IRFP240 / 9240)?
If so, what changes should I make?
Thank you.
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