500W PA amplifier with Limiter

[mihailo]

Some tutorial in Slovakian...
and site link Zosilòovaè 700W

 

[khalsa]

Very good MIHAILO KHALSA

 

[AndrewT]

Why 5A fuses for 2ohm speakers?

If the 5A fuses will pass 10Arms to the 2ohm load then maximum power is only 200W into 2r0 and that only needs +-35Vdc

Now if 20Arms were to pass to the load then maximum power would be 800W into 2r0. and that needs +-65Vdc

To get the benefit of your +-100Vdc supply rails the fuses would need to pass ~30Arms to the 2ohm speaker load. Giving ~1800W into 2r0.

Can your 5A fuses pass ~42Apk to the loading?

BTW,
6ohm speakers will run from F5A fuses.

 

[teslar]

Pcb and component side....

Hi mihailo
Thank you for share Pcb and component side.
Regards.

 

[mihailo]

AndrewT this is not my project! Found it on web, and it look interesting to me.
I need amplifier which can work on 2ohm, because I have loot PA speakers.
So I post it if someone have same problem. With some changes it will work fine.
Regards

 

[engel dela pena]

the link says http://www.zosilnovace.eu/Zosilnovac700W.htm
Zosilòovaè 700W
Technical parameters:

Supply voltage: max. + /-80V

Current protection: 2x15 fast Fuses

Output: 680W/2R, 450W/4R, 260W/8R (measured 550VA transformer with voltage 2x54V empty)

Frequency response: 10 to 180 000Hz/-3dB

Harmonic distortion: 0.034% in 480W/1kHz; 0.07% at 480W/10kHz

Intermodulation distortion: 0.037% at 300W / 80 +7 kHz

Impedance: min. 2R

Speed ​​course (SR): 35V/us

Input sensitivity: about 1.1 V for full excitation

PCB dimension: 90x260 mm

Note: Measured performances are measured on a 550VA transformer as stated in the note. Output power is measured for max. 50-10 minutes because the transformer is considerably overloading. When properly sized to about 1 kVA transformer is not a problem to achieve performance 800W/2R.

 

[wattaniya]

what happened to apex sir?

 

[rompi]

hello sir apex and all members....

i have a transformer 37-0-37 15 amps. can i use this in B500 pwr amplifier tha output voltage somthing like 80 plus -+ pls. help me so that i can start my project i have 3 15 amps transformer ....

best regaqrds

 

[AndrewT]

37 is the AC voltage from the transformer when fed with rated input voltage and loaded to deliver exactly 15Aac.

The peak of a sinewave waveform is Vac*sqrt(2)
A 37 Vac transformer will have a peak output voltage of ~52.3Vpk when driven at rated voltage and loaded to rated current.
You cannot get 80Vac nor 80Vdc from your transformer.

However, if you series connect the secondary for 74Vac and increase the supply voltage you can get a single 80Vac, if you are careful to avoid overheating.

 

[rompi]

hi hello sir andrew
im sorry im wrong my 37-0-37 is ac and when i rectify to dc it measure 80 plus dc voltage correct me if im wrong i appreciate all comments and help from all member...

regards rompi

 

[AndrewT]

37Vac does not give 80Vdc after rectification.

 

[rlg_200]

37 VAC it gives only 52.3VDC depends on the rectification/regulation you apply.

 

[rompi]

hi sir andrew and rlg.... thank you for your reply so 52.3 vdc can used this to B500 amps? im so interested to make this power amp pls help me....

regards rompi...

 

[viki_v2]

Is it possible the output will distort at high volumes if not using protection board.

 

[AndrewT]

if the operator sends too high a signal to any stage then that stage will clip.

The operator causes the distortion resulting from overload.

 

[viki_v2]

if the operator sends too high a signal to any stage then that stage will clip.

The operator causes the distortion resulting from overload.

Sir, I didn't get it, I am using mobile phone as signal input

 

[rompi]

GOOD DAY SIR ANDREW AND TO ALL MEMBERS..

SIR THANKS ALOT FOR THE REPLY SO I CAN USE MY 37 0 37 TRANSFORMER FOR B500

REGARDS

 

[teslar]

Sample 4 Channel B500

Sample 4 Channel APEX B500 and use bridge mode future.

 

[engel dela pena]

teslar
good transformer how many kilogram?

 

[aman khalsa]

hello sir teslar..

nice work...