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Old 23rd October 2011, 03:57 AM   #2041
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Quote:
Originally Posted by rfj5106 View Post
Soft start circuitry HAS to connect directly to the AC input (after the on-off switch) and then directly to the toroid transformer for it to work. Why would you need an isolation transformer? I usually use an AC light bulb after the on-off switch. Is that unsafe too? Please explain, I need the education.

the normal way AC is sensed should be on the secondary side of the transformer, before it reaches the bridge rectifier.

Pics below are of amp in progress (fully working), Mini aleph, Class A, +- 10W per channel, dissipation +- 40W per channel.
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File Type: jpg 18.jpg (96.8 KB, 1635 views)
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Last edited by digits; 23rd October 2011 at 04:10 AM.
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Old 25th October 2011, 05:25 PM   #2042
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here is a construction of a headphone amplifier 5532 based .... actually its ultra quiet and plays very fine

enjoy the cute box and the neat vero board pcb
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File Type: jpg 1.jpg (135.6 KB, 1489 views)
File Type: jpg 2.jpg (72.7 KB, 1396 views)
File Type: jpg 3.jpg (84.8 KB, 314 views)
File Type: jpg 4.jpg (78.4 KB, 287 views)
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 25th October 2011, 05:26 PM   #2043
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.
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 25th October 2011, 05:32 PM   #2044
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similar to the above i made also a small Riaa .... in both cases the trafo is housed in an outside wall pack ( we do have empty housings for trafos capable of 2x18v 10W )
that come very handy in situations like that .

some photo....
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File Type: jpg 2.jpg (131.6 KB, 363 views)
File Type: jpg 3.jpg (106.7 KB, 356 views)
File Type: jpg 4.jpg (126.7 KB, 274 views)
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 25th October 2011, 07:57 PM   #2045
CECCO is offline CECCO  Italy
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LOL, The right name for this amp, could be " the Coffin Amplifier"
Chhers..
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Old 26th October 2011, 07:12 AM   #2046
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in a way yes !!!! ha ha ha but works !!
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 27th October 2011, 06:16 PM   #2047
CECCO is offline CECCO  Italy
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Or..."the Halloween Amplifier" sounds better.


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Old 31st October 2011, 05:05 AM   #2048
dimka is offline dimka  Russian Federation
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My QUAD-405 clone
PA300692.JPG
PA300694.JPG
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Old 6th November 2011, 09:41 PM   #2049
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This is an MP3 player embedded in the frame have an old receiver.
Amplifier to a stereo amplifier is 25 watt،I used the IC TDA2009A.
25 volt power supply is،It can be used to feed my old printer.
Click the image to open in full size.
It's the opposite of the view
Click the image to open in full size.
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Old 7th November 2011, 06:31 AM   #2050
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Quote:
Originally Posted by shahryar52 View Post
This is an MP3 player embedded in the frame have an old receiver.
Amplifier to a stereo amplifier is 25 watt،I used the IC TDA2009A.
25 volt power supply is،It can be used to feed my old printer.
Click the image to open in full size.
It's the opposite of the view
Click the image to open in full size.
Very interesting, can you share more detail?
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