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Old 11th October 2009, 10:41 AM   #61
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Quote:
Originally Posted by destroyer X View Post
So, having 200 wiskies into the bass, i will need 60 to the mids and 20 to the treble.
Those are the average figures, if all speakers have the same sensitivity. They were used in the past to determine the power rating of each speaker. Manufacturers used to combine a 60 W woofer, with a 30 W mid-range and a 10 W tweeter and call it a 100 W three-way speaker.

If you want a flat frequency response, you need the same power for all three ways, adjusted for the different sensitivities. E. g. if the woofer makes 94 dB/W/1 and the tweeter makes 100 dB/W/m you need four times the power for the bass than for the tweeter.

The configuration with 200/60/20 W works, if the bass has 10 dB higher sensitivity than the tweeter and the mid-range has ~5 dB higher sensitivity than the tweeter.

The numbers also shift for different crossover frequencies.
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Old 11th October 2009, 02:28 PM   #62
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Default Yeah...and if does not work we gonna fix that and will produce higher power versions

I hope will work.... if not...will be easy to increase power....have just to increase supply voltage and tweak a little the power units.

I have made BiAmp...and really i am using 40 percent to mids and highs...the amplifier has the same power i have into the bass unit, but i am using very low volume to the highs and mids.... the old fashion formula worked to the BiAmp.... i hope will work for TriAmp too.

We are doing dear Pacific...we go testing and doing... and this is positive... try to imagine if Henry Ford have decided heard all criticisms made to him about the assembling line.... people always see problems and logic failures in everything... at least Pacific...me and you...we build things!

People said to Henry Ford that barbecue near an automobile was crazy..because fire and gasoline are not things to be together.

Someone was arrested because told the planet was rounded.

I have no problem to say:

- "Have not worked this way"..... i use to say and i start to do another way.

They go talking and we go building.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 11th October 2009 at 02:31 PM.
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Old 11th October 2009, 04:56 PM   #63
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Uncle Charlie

Thanks for the very detailed information - even a caveman (like myself) can follow it...

I hope to have news about you signal generator and several pounds of components soon.
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Old 11th October 2009, 06:15 PM   #64
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Default You're not a caveman.... cavemen wish to be alike you

You are one of the best Acoustic Engineers i have ever met.

Thank you very much...you turn my efforts something positive.

Many pounds?

I see you have surprises to me...as Sakis Petropoulos electrolitic condensers (6) and your gift, the signal generator constitutes and a couple of pounds only.

hehehehe....nice that!..... i will have some surprises.....good!

You know... the key ring, or Key chain...those "chaveiros" from Sakis..with the Eastelectronics brand printed are very needed here..also the generator and the condensers.... i will be waiting alike a children.

Thank you, in advance, by the kindness to transport those things to me.. including your gifts to uncle Charlie.

Carlos
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File Type: jpg Key chain.jpg (611.1 KB, 230 views)
File Type: jpg Sakis condensers.jpg (801.2 KB, 198 views)
File Type: jpg Alike a children.jpg (727.7 KB, 161 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 11th October 2009 at 06:28 PM.
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Old 12th October 2009, 11:34 AM   #65
AndrewT is offline AndrewT  Scotland
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Hi,
before one can determine the power (signal voltage) to be sent to each driver (speaker) one must know the sensitivity and impedance of each driver.
After this is known or determined then one can calculate or estimate the signal voltage to be supplied to each speaker.
The result of doing this may end up with 90dB/W/m 8ohm bass requiring 100W into 8ohm, 90dB/W/m 6ohm mid requiring 150W into 6ohm and 96dB 8ohm treble requiring 25W into 8ohm.

None of this determination refers in any way to the average power levels in various different parts of the frequency range of any types of music or audio source.

Just as Pacific says
Quote:
If you want a flat frequency response, you need the same power for all three ways
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Old 12th October 2009, 11:34 AM   #66
AndrewT is offline AndrewT  Scotland
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Dx,
the driver transistor is still shown upside down.
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Old 12th October 2009, 03:07 PM   #67
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Default Here you see some pictures from the Dx TriAmp - under construction

attached,

regards,

Carlos
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File Type: jpg Dx TriAmp - 1.jpg (763.6 KB, 122 views)
File Type: jpg Dx TriAmp - 2.jpg (817.3 KB, 133 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 12th October 2009, 03:09 PM   #68
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Default More pictures

Attached,

regards,

Carlos
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File Type: jpg Dx TriAmp - 4.jpg (727.2 KB, 84 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 12th October 2009, 03:37 PM   #69
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Default Please, invert the PNP driver colector and emitter leads

They were show wrong into the schematic....also fix if you see in another schematic version.... do it for yourself if you decide to build.

Thank you Andrew T

regards,

Carlos
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File Type: jpg Fix PNP inverted driver.jpg (555.0 KB, 84 views)
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Old 12th October 2009, 03:56 PM   #70
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Default Dx TriAmp, bass unit, 62V, REVISION III schematic

The PNP driver was fixed...not inverted anymore.

Observe new adjustments to the off set and bias....new values.

Current into each power emitter resistances continue around 1 miliampere

Off set continue to be smaller than 1 milivolt (700uV)

regards,

Carlos
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File Type: jpg Dx TriAmp, Bass unit, 62V, REVISION III.jpg (901.6 KB, 87 views)
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