To Raoul : Still nothing on mail - kazzatel(at)seznam.cz 😎 EDIT: @ removed by peranders, SPAM protection
Bill don't like us, so we must try it again 😱) . I'm sorry, I don't know correct english words, but I'm " total bezofen " now. I'm sorry guys, I must go to sleep now. 😉
Hi Pavel,
I can't seem to get through to you by email. I was wondering what the final cost of the boards were, including shipping (I live in the US). Also, how you like to receive payment. My email is:
lawsower(at)yahoo.com
Best regards
Steve
I can't seem to get through to you by email. I was wondering what the final cost of the boards were, including shipping (I live in the US). Also, how you like to receive payment. My email is:
lawsower(at)yahoo.com
Best regards
Steve
I have normally no problems with emails to Pavel. Maybe the trouble is in your end?Raoul said:
Thanks to PMA you can see measuring results of distortion LM 4780 in PA 03 module, measured by his multitone method. You can compare distortion of generator with distortion of complete amp. All is measured by output power 5 W / 8 Ohm and results are surprisely good. At first distortion of generator by 10 kHz :
Attachments
-100 dB approx for the 3rd tone, = 0.001% and -95dB for first harmonic. Impressive for a "bad" and "boring" IC according to some.
peranders said:
100dB with 16bit measuring resolution?
from Spectraplus help:
"An important factor in determining the quality of the sampled sound is the number of bits per sample. This specifies the number of discrete levels that are used in the analog to digital (A/D) conversion process and directly affects the dynamic range of the measurement. The theoretical dynamic range is shown below:
8 bit sampling precision = 48 dB
16 bit sampling precision = 96 dB
In practice, the achievable dynamic range is less that the theoretical maximum due to internal noise and other factors. Refer to your sound card documentation for the actual performance figures."
I'll guess there are some difference when you do a FFT.
Here you can check measurements done with my stuff
Here you can check measurements done with my stuff
Hi!
For much required PCBs I would suggest this firm in India:
http://shogini.com/html/index.htm
Work is very good, prices reasonable and yes they do small quantity trial run too.
Just a suggestion.
Regards
Rahul
For much required PCBs I would suggest this firm in India:
http://shogini.com/html/index.htm
Work is very good, prices reasonable and yes they do small quantity trial run too.
Just a suggestion.
Regards
Rahul
2x220W/4ohm questions...
I'm looking for amps to power a pair of Siegfried Linkwitz's Thor subwoofers - Pavel's website says that the PA03 modules can be paralleled for high current output 220W/4ohm operation amking it perfet for the job. (And much cheaper than the $750 amp Siegfried suggests).
Are two modules needed for 2x220W or four modules?
Also, what does his kit contain? Just the PCB or everything except the power transformers, rectifiers, and PS caps?
For a subwoofer amp would I need 2 or 4 transformers?
I'm looking for amps to power a pair of Siegfried Linkwitz's Thor subwoofers - Pavel's website says that the PA03 modules can be paralleled for high current output 220W/4ohm operation amking it perfet for the job. (And much cheaper than the $750 amp Siegfried suggests).
Are two modules needed for 2x220W or four modules?
Also, what does his kit contain? Just the PCB or everything except the power transformers, rectifiers, and PS caps?
For a subwoofer amp would I need 2 or 4 transformers?