500W PA amplifier with Limiter

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#521
Your work can help to other diyers without expirience to not be afraid to build their own amplifier, somethimes only soldering is needed (if someone build and test amplifier circuit before you), and learn ohm's law.
Regards
 
Last edited:
#523
without an understanding of Ohm's Law one cannot specify the fuse for a piece of equipment.
Without arithmetic one can forget about following a schematic.

Without arithmetic one can never get beyond copying someone else's explicit instructions.
 
#528
Transformer

hamub said:
if i use it with the b500 how much power can i get considering that after rectifying its gonna be something like 45-0-45. I want to use this transformer till i get a good one
Click to expand...

is it ok for this transformer which i rewound the secondary to draw a current of 1.7AMPS at the primary when not loaded for a 220 volts supply. I connect my ammeter in series.
 
#531
1.7A when on no load equates to 374W for zero secondary output.
That 374W must escape as heat.

I do not believe that the 1.7A figure has been measured correctly.
It cannot be right. The transformer would be smoking, or worse, if it was dissipating 1.7Aac @ 220Vac
 
#532
AndrewT said:
1.7A when on no load equates to 374W for zero secondary output.
That 374W must escape as heat.

I do not believe that the 1.7A figure has been measured correctly.
It cannot be right. The transformer would be smoking, or worse, if it was dissipating 1.7Aac @ 220Vac
Click to expand...

the figure is correct Andrew. This tx is as cold as the antarctic. I took it from a microwave oven rewound it to give 32-0-32 at the secöndary. I did not wind the primary.
 
#533
AndrewT said:
1.7A when on no load equates to 374W for zero secondary output.
That 374W must escape as heat.

I do not believe that the 1.7A figure has been measured correctly.
It cannot be right. The transformer would be smoking, or worse, if it was dissipating 1.7Aac @ 220Vac
Click to expand...
don't forget the P.F. (power factor). an unloaded transformer acts as an iron cored inductor, so most of the 374VA are VARs not watts.:bulb: And it is the few watts that will contribute to the heating.
 
#538

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