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Old 13th September 2012, 12:55 AM   #171
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Certainly There's Very Very Few Namebranded Amps That Do What They Claim, I Don't Know, Lets Say POWERSOFT? CAMCO? LabGruppen? But Even For Those Badass Amps There's No Substantial Rules & Regulations About Power Ratings In Their Wide Range Of Technical Tests, So They Can Easily Claim Overrated Parameters On Their Products, And Hell Lets Speak The Truth Between Us, How Many People You Know That Have Any Knowledge About Amp Specs? They Need Just A Thing To Put Sound On Their Speaker System And That's It !!! Very Few People Cares Even About Speaker Impedance.
Just My Point Of View.....
Cheers To Anyone.....
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Last edited by kimberlator; 13th September 2012 at 12:58 AM. Reason: Correct Information !!!
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Old 13th September 2012, 01:05 AM   #172
AJT is offline AJT  Philippines
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as long as we are aware that most power claims are just that, claims, then i guess we are on the ground....the dreamin' goes on.....

it is either FTC or it is not.....
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Old 13th September 2012, 05:44 PM   #173
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Default ?

Quote:
Originally Posted by Tony View Post
as long as we are aware that most power claims are just that, claims, then i guess we are on the ground....the dreamin' goes on.....

it is either FTC or it is not.....
Yes, We Are Aware So All People Are, But Not Everyone Know For Sure If "PYLE" Amplifier Will Deliver 1000Watts Per Channel @4R As The Amp States In Its Front Plate, Right?
"PYLE" Amplifier Will Deliver 1000Watts Per Channel @4R..Hummmmm......FTC Or EIA? Or Both? And Believe It Or Not This Same Issue Applies In A Very Wide Variety Of "NAMEBRANDED" P.A. Amps, Because As The Article Reads "There's No Such Regulations For Professional Audio Equipment" Nice Dont You Think????
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Old 17th September 2012, 01:08 AM   #174
DIYGEEK is offline DIYGEEK  United States
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Default I'm in...!!!

I have two large transformers from QSC amplifiers USA1310 and MX1500

I desire to build a large 500watt 8 ohm amp capable of 4 ohm sub work.

I like Workhorse design seems very roubust... lets continue this was getting intresting.

A posting of Rods revised circuit would be great too.

My transformers hit 95 volts after regulation, would love a great circuit for them.

Pat
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Old 17th September 2012, 03:46 PM   #175
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@ Sir Vedmitraa
Maybe you have done a mistake, as in the pic you have connected 0.22R resistor to the base of the transistor which goes to the output, and 4.7R resistor to the emitter of the transistor on both sides, Kindly check before powering up.

Regards,
Aniket
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Old 19th September 2012, 07:54 AM   #176
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Thanks Aniket for pointing out the fault.that photo is quite old yeah there was this mistake but I rectified that mistake next day.Here is the photo of working amp with 1 ohm load and digital meter connected at output with test tone of 1khz.Meter is showing output voltage.
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Old 19th September 2012, 08:12 AM   #177
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I am not familiar with any instrument at least like the ones shown in the picture that are able to measure correctly anything above 400HZ but may be i am wrong .....
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Old 19th September 2012, 08:23 AM   #178
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I have used my cheap DMM @ upto and including 50kHz.

I use the comparison method when ever I need good accuracy and/or repeatability.

If I set up an input attenuator that exactly cancels the gain of the amplifier under test, then I can compare the input voltage before the attenuator with the output voltage after the amplifier.
I am comparing DMM Vac readings that are the SAME voltage and the SAME frequency.

If the DMM tells me the voltages are the same, then I believe it. Even when I know that the DMM is decades outside it specified operating frequency range. eg, the input could be set to read 2Vac at 200Hz and at 900Hz, but might read 1.4Vac at 10kHz and 525mVac at 50kHz.
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Last edited by AndrewT; 19th September 2012 at 08:26 AM.
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Old 19th September 2012, 06:49 PM   #179
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Well I am not that much in theories but when measured with this meter it gave me 66 volts on 100hz ;61.4 volts on 1khz and 52 volts on 20 khz;on 1 ohm load at output signal voltage 1volt with my signal generator on sine wave and rail voltage 90-0-90 on load.
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Old 21st September 2012, 08:59 PM   #180
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Default works I have been doinng

Thanks to all seniors in diyaudio because of them i could do this work ,some of my works photos,please see my page at facebook for more photos.
Vedmitra Sharma
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