DJLeco wrote:
Mine club amplifier, saturday it have sudden death...
Working on 2,66 ohm/channel/mid-hi 110 Hz above.
Died NTC thermistors 10 ohm from inrush current limmiter circuit.
But oficially, those must been shorted by blue relais after 2-3
seconds from startup, but relais doesnt receive 24 volts for coil...
TO ALL OWNERS OF PROLINE 2700,PROLINE 3000, SI PHONIC, check and better , REPLACE, parralel diode on relais coil (D503 at Proline 2700 si 3000),Specially if is 1N4148 with 1N4007.
Also replace the transistor wich commands the 24Vdc for relais coil (TR503 at Proline 2700 si 3000), officialy is C2240 (2SC2240) with BD139 or better, BD237.
As ideea, the ones wich have Proline 2700, or Proline 3000 amps, and found those NTC thermistors burned, the relais doesn't work well.
Amp 1:
Burned PCB:
Output devices, originals ON Semiconductor:
Final stage Ch1:
Trafo:
NTC:
NTC differency with the ones that I put there:
NTC changed:
Secondary Cu-Em, just 1,5mm diameter, TOO TINY!!
Soft start:
Here is where must be changed those transistors and diode!
[size=16]Small movies:
Inrush current limmiter now working!:
http://www.youtube.com/watch?v=3J2CUXPKCiU" rel="nofollow - http://www.youtube.com/watch?v=3J2CUXPKCiU
Prezentare+1Ch @ 1000 Hz ,max 76,5 Vrms-4 ohm:
http://www.youtube.com/watch?v=CaAO_yaPS5o" rel="nofollow - http://www.youtube.com/watch?v=CaAO_yaPS5o
Ch1+Ch2 @ 1000 Hz/4 ohm:
http://www.youtube.com/watch?v=LsouZ0Eudxo" rel="nofollow - http://www.youtube.com/watch?v=LsouZ0Eudxo
Ch1+Ch2 @ 100 Hz/4 ohm:
http://www.youtube.com/watch?v=G_m_axkDSdU" rel="nofollow - http://www.youtube.com/watch?v=G_m_axkDSdU
Ch1+Ch2 @ 30 Hz/4 ohm:
http://www.youtube.com/watch?v=MRlikzJa1xw" rel="nofollow - http://www.youtube.com/watch?v=MRlikzJa1xw
Ch1+Ch2 @ 5000 Hz/4 ohm:
http://www.youtube.com/watch?v=YFWdPjgsOdI" rel="nofollow - http://www.youtube.com/watch?v=YFWdPjgsOdI
Ch1+Ch2 @ 10000 Hz/4 ohm:
http://www.youtube.com/watch?v=68dINx3DB5U" rel="nofollow - http://www.youtube.com/watch?v=68dINx3DB5U
Ch1+Ch2 @ 20000 Hz/4 ohm:
http://www.youtube.com/watch?v=2-YvTKGzxPY" rel="nofollow - http://www.youtube.com/watch?v=2-YvTKGzxPY
Just Ch 1 @1000Hz and 100 Hz/2 ohm:
http://www.youtube.com/watch?v=Ub5dnu0a4ww" rel="nofollow - http://www.youtube.com/watch?v=Ub5dnu0a4ww
Just Ch 1 @30 Hz-2 ohm
http://www.youtube.com/watch?v=I91SYI4EvHo" rel="nofollow - http://www.youtube.com/watch?v=I91SYI4EvHo
Just Ch 1 @100 Hz/2 ohm supply voltage dropping:
http://www.youtube.com/watch?v=XwinMDbpQXk" rel="nofollow - http://www.youtube.com/watch?v=XwinMDbpQXk
Advantages and disadvantages:
http://www.youtube.com/watch?v=Fmv_1kOnTuc" rel="nofollow - http://www.youtube.com/watch?v=Fmv_1kOnTuc
Comments or questions,are welcomed!
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