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Old 16th July 2013, 04:22 AM   #21
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controversial power from Lamongan Indonesia
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Old 17th July 2013, 01:14 PM   #22
JMFahey is offline JMFahey  Argentina
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Quote:
they are a group of very excited
No doubt.

You should edit that to:

Quote:
they are a group of very excited NOOBS
Don't worry, we have a lot of excitement around here , about a 1000W amp which was posted *almost* as a joke, considering that same amp designer has also posted *impressive*, World class amps here, but none of them created such a sensation.

I guess "1000W" is the magic label
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Old 18th July 2013, 10:47 PM   #23
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by JMFahey View Post

Don't worry, we have a lot of excitement around here , about a 1000W amp which was posted *almost* as a joke, considering that same amp designer has also posted *impressive*, World class amps here, but none of them created such a sensation.

I guess "1000W" is the magic label
There are different tradition in the country, single pair tip3055/2955 is 100watt, single pair 2n3055/mj2955 is 150W single pair sanken MT200 is 200W, then 4pair that MJL should be 4x150W or 600W.

Also that TIP won't work at high voltages. I found this sch
http://s19.postimg.org/jk0y7uf5f/Namec_sch.png
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Old 22nd July 2013, 08:47 PM   #24
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how to get out 1000wat?
no draw bias.
45Vac 1000wat how do you calculate it?
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Old 29th July 2013, 01:43 AM   #25
Riff is offline Riff  Indonesia
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Quote:
Originally Posted by ontoaba View Post
There are different tradition in the country, single pair tip3055/2955 is 100watt, single pair 2n3055/mj2955 is 150W single pair sanken MT200 is 200W, then 4pair that MJL should be 4x150W or 600W.

Also that TIP won't work at high voltages. I found this sch
http://s19.postimg.org/jk0y7uf5f/Namec_sch.png
look like pioner 010, i think it's a same PA...or something plagiat lol...
ocl+pioner+pa+010.jpg
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Old 29th July 2013, 03:16 AM   #26
gootee is offline gootee  United States
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Quote:
Originally Posted by jolodonk07 View Post
how to get out 1000wat?
no draw bias.
45Vac 1000wat how do you calculate it?
45 Volts AC RMS gives 63.64 Volts Peak.

Subtract 3 Volts for worst-case rectifier drop. Gives 60.64 Volts peak.

Assume 6 Volts (just a guess) for minimum voltage between power rail and output, Vclip, across amplifier.

So peak rail voltage, Vrailpk, is assumed to be 60.64 Volts.

You cannot get 1000 Watts RMS into 2 Ohms or more, with that rail voltage.

But you could get 1000 Watts RMS into 1 Ohm:

Voutpk = √(2(P_rms)(Rload))

For 1000 W RMS into 1 Ohm:

Voutpk = √(2(1000)(1)) = 44.72 Volts Peak

Vout_RMS = 31.62 Volts

The minimum reservoir capacitance would be:

Cmin (in uF) = 1000000(Vpk/(Rload(Vrail-Vclip-Vpk)))( (1/(2 fmains)) + (0.02/Voltage_Rating) )

Cmin (in uF) = 1000000(44.72/(1(60.64-6-44.72)))( (1/(2x50)) + (0.02/63) )

Cmin = 46520 uF

I would recommend using qty 10 x 4700 uF, at a minimum.

If you used 100000 uF, then the max rated RMS output power would be 1226 Watts, because the max clipping voltage would be lower, so the rated max peak output voltage could be higher.

-------------------

For higher-impedance speakers:

Voutpk = √(2(P_rms)(Rload))

Voutpk for 1000W RMS into 8 Ohms would be 126.4 V peak. You would have to add Vripple, Vclip, and Vdiodes to that, to get the needed transformer output voltage. The peak current would be 15.8 amps. So maybe add 15 Volts, giving 141 V pk, or 100 V RMS transformer output. The good news is that it would only need about 22000 uF per rail.

Voutpk for 1000W RMS into 4 Ohms would be 89.4 V peak. You would have to add Vripple, Vclip, and Vdiodes to that, to get the needed transformer output voltage. The peak output current would be 22.4 amps. So maybe add 15 Volts, giving 104.4 V pk, or 74 V RMS transformer output. The good news is that it would only need about 25200 uF per rail (but 47000 uF would get the ripple down to 5%).
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Old 29th July 2013, 03:23 AM   #27
bimo is online now bimo  Indonesia
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Many amp. kits from Indonesia claimed more power than it's should be. They can not distinguish about RMS power and PMPO power or they did not care. I doubt they even measure their designs. It is shame .
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Old 29th July 2013, 03:30 AM   #28
bimo is online now bimo  Indonesia
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Quote:
Originally Posted by jolodonk07 View Post
how to get out 1000wat?
no draw bias.
45Vac 1000wat how do you calculate it?
Typical question from Indonesia (HOW). Can you ask "WHY" question?
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Old 29th July 2013, 04:07 AM   #29
naf is offline naf  Indonesia
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Old 29th July 2013, 05:17 AM   #30
gootee is offline gootee  United States
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Correction:

Quote:
If you used 100000 uF, then the max rated RMS output power would be 1226 Watts, because the max clipping voltage would be lower, so the rated max peak output voltage could be higher.
Should have written "max ripple voltage" instead of "max clipping voltage", there.
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