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500W PA amplifier with Limiter
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Old 15th November 2011, 10:36 AM   #1791
AndrewT is offline AndrewT  Scotland
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post1786
shows how to calculate Vpk from load and power specification.
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Old 15th November 2011, 01:11 PM   #1792
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by AndrewT View Post
post1786
shows how to calculate Vpk from load and power specification.
Thanks you Andrew T
Ok, now for 500W into 4R load
Vpk = sqrt(500 * 4 * 2)
= sqrt(4000)
Vpk = 63.2
Now I know to get 500W into 4R load we need 63.2 Vpk but
how I know the ideal rail voltage to get this 63.2 Vpk?
If the rail voltage says +80/-80V DC is this enough?
I know to get 63.2 Vpk we need higher rail but don't know how much high

also the Vac from trafo says 57Vac = 80VDC
in real life maybe not 80VDC, it's will drop anyway... bad caps or something else

I'm sorry if I miss the formula to calculate this rail voltage, if there was posted

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Old 15th November 2011, 01:15 PM   #1793
irvynejay is offline irvynejay  Philippines
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Quote:
Originally Posted by JOHN BALI View Post
Hi everyone,

Hi jacobsetti, have you built it one?
Mr Mile will be answer you if you built one of this good amp
Maybe 60 - 0 - 60 volt DC will give you 300w to 4R
see this one 100W Ultimate Fidelity Amplifier AX20

I made it, my B500
already on the heatsink & hope not too small
But:
1. Why offset just to high
as recommended 20mV or less, my B500 is
-466mV & -123mV
& the voltage
on 100ohm resistor is little below 0,5V
on base emitter KSE340(bias) is little below 2V

2. use 2 x transformer 50Vac but
DC after rectifier is 61VDC, should be 65-66VDC
(Vac is drop to 46Vac because test is at night)
Maybe bad caps or something?

Anyone please help, where do I start to check it out?

Regards
Have you found the problem?
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Old 15th November 2011, 01:25 PM   #1794
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by JOHN BALI View Post
This is my new pcb design, change of 43k with 10k + 33k
another one is on page 500W PA amplifier with Limiter

enjoy
I'm sorry there was a mistake to my design...
pin of IC is split
pin 1 & pin 3
now there is two jumper on the back side of my PCB
that was make the amp not working...
I feel so sorry if there was anybody made it too

Now this couple amp I made has 8mV & 9mV offset
I will post picture soon

Regards
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Old 15th November 2011, 01:31 PM   #1795
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by irvynejay View Post
Have you found the problem?
Yes I have...
Now it's working, but when the volume just a little the sound is distort
Maybe some bias adjust will fix this,
but I will experience with this
I want to otak atik
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Old 15th November 2011, 01:40 PM   #1796
irvynejay is offline irvynejay  Philippines
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try to separate S ground and main ground
on your PCB main and s ground is joined it should be separated

mark red should be on separate wire going to ground of psu
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File Type: jpg APEXaudio B500 PCBMON.jpg (460.5 KB, 1187 views)
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Old 15th November 2011, 04:25 PM   #1797
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by JOHN BALI View Post
but
how I know the ideal rail voltage to get this 63.2 Vpk?
If the rail voltage says +80/-80V DC is this enough?
I know to get 63.2 Vpk we need higher rail but don't know how much high

also the Vac from trafo says 57Vac = 80VDC
in real life maybe not 80VDC, it's will drop anyway...
expect the quiescent voltage of a ClassAB amplifier to be ~1V below the Vpk at the smoothing capacitors.
This will result in ~83V-1Vdc on the supply rail when the mains is at nominal voltage and the amplifier is biased to it's design settings.
Expect this 82Vdc rail voltage to vary by ~+-6% for mains supply variations. That will give you supply rail voltage range when delivering zero power of ~78Vdc to ~88Vdc.

Now to delivering maximum power.
Are you a manufacturer that is guaranteeing the maximum power at the output for the full range of possible mains voltages? Or a manufacturer looking to impress gullible customers where the guaranteed maximum power can only be delivered when mains supply is at maximum voltage tolerance?
Or a DIYer who wants Maximum Power when mains is at nominal supply voltage? Or do you want to design the output stage to survive the rare operational condition of maximum output power being delivered when mains supply voltage is at maximum tolerance?
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Old 16th November 2011, 05:21 AM   #1798
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by AndrewT View Post
Now to delivering maximum power.
Are you a manufacturer that is guaranteeing the maximum power at the output for the full range of possible mains voltages? Or a manufacturer looking to impress gullible customers where the guaranteed maximum power can only be delivered when mains supply is at maximum voltage tolerance?
Or a DIYer who wants Maximum Power when mains is at nominal supply voltage? Or do you want to design the output stage to survive the rare operational condition of maximum output power being delivered when mains supply voltage is at maximum tolerance?
I don't wanna be a manufacturer looking to impress gullible customers
like that (like the picture bellow)
I don't want to lie or lying costumers like that
I have take a look what inside, there is one tafo 23,5Vac ct 23,5Vac (150VA maybe)
amplifier circuit using 1 pair TIP2955/3055 per channel
load 8 ohm
so the rail says +/-32 VDC
power output = ... I don't know how to calculate?
maybe only 50 to 60 watt, to get 50W need 28.2Vpk?

I am a DIYer who wants maximum power when my mains voltage allow to do maximum.
right here the ac main voltage not so good regulation
when at evening - night the voltage drop to 180V - 200V ac
normally its 220V ac

I don't have measuring equipment such as oscilloscope, but multitester only
So to get 500W to 4 R load = ... V DC? Please the formula or an example

Regards
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Old 16th November 2011, 05:26 AM   #1799
JOHN BALI is offline JOHN BALI  Indonesia
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Quote:
Originally Posted by irvynejay View Post
try to separate S ground and main ground
on your PCB main and s ground is joined it should be separated

mark red should be on separate wire going to ground of psu
Yes mam...
It's just for testing amp...
The PCB track is separate

Few days ago I saw this Apexaudio Vertex Amp 2 Step - SOLFEGIO | www.solfegio.com
that is on Indonesian forum
Its really you (I don't think so) or someone else try to surprise the forum
I'm sorry if all of this make you mad

Thanks
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File Type: jpg correctting pin 1 to 3 copy.jpg (255.4 KB, 951 views)

Last edited by JOHN BALI; 16th November 2011 at 05:30 AM.
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Old 16th November 2011, 08:14 AM   #1800
irvynejay is offline irvynejay  Philippines
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yes your correct that's my post on your forum

no im not mad why do i have too?
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