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Old 20th May 2013, 12:10 PM   #101
kebbz is offline kebbz  Serbia
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My multimeter measures :
2-200 V range :40-400 Hz
Shown value : average rate (in case of RMS sinus sign)
Meh, so at the end the amp power might me even less than its measured. At the end it will be 100 Watts instead of anticipated 1000W
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Old 21st May 2013, 11:27 AM   #102
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Default Emitter resistor problem?

Hi All - i started building this setup but i ran into difficulty in sourcing for the 0.15 emitter resistors and could only find 0.27 resistors ,can this still work ?


Component list: (1x AMP)
1x 680 (680R) Resistor
1x 10K Resistor
3x 22K Resistor
1x 6.8 (6R8) 5W Resistor
2x 0.15 (0R15) 5W Resistor
2x 10uF 50V Capacitor
2x 22uF 50V Capacitor
1x 1uF 63V MKT/BiPolar Capacitor
1x TDA7294 Chip AMP
1x 2SA1943 PNP Transistor
1x 2SC5200 NPN Transistor

Schematic:
Click the image to open in full size.
NOTE: 6.8Ohm resistor is a 5W
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Old 21st May 2013, 02:37 PM   #103
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yes everything up to 0.5Ohm will work (larger will also work), but remember the more Ohm the more heat/power is lost in the resistors, the 0.15 i use is because i have a "case" of them and want to keep all the amps i make the same
Of course you can use to little and risk the chance of blown output transistors, but so far with 0.15Ohm i have played 2 OHM 500W speakers up to their limit without any problems.
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Old 21st May 2013, 08:17 PM   #104
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thanks a lot man i appreciate it
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Old 24th May 2013, 12:16 AM   #105
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Default dissapointment

unfortunately the sound was disappointing,it sounded nothing close to all that has been claimed ,i think the power out put was just 80Watt .the transistors look like this picture from the net....could they be fake?
Attached Images
File Type: jpg 2SC5200_2SA1943.jpg (70.6 KB, 730 views)
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Old 24th May 2013, 08:26 AM   #106
AndrewT is offline AndrewT  Scotland
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they look genuine.
__________________
regards Andrew T.
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Old 24th May 2013, 09:09 AM   #107
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did you hook up the transistors properly, if you only get about 80W than that sounds like only driver is the TDA729x
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Old 24th May 2013, 10:05 AM   #108
kebbz is offline kebbz  Serbia
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Hey mashoni23, before the bridged amp I've built this one, here is the image of the finished module and the PCB layout, hope it helps. My output transistors aren't even the same one is japan and the other who knows, but it was hooked up and tested and sounded just fine.

Click the image to open in full size.
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Old 24th May 2013, 10:15 AM   #109
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just to be clear, they extra power stage is not dependant on C5200/A1943 i just choice them because of the power and because the set are newer (2011)
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Old 24th May 2013, 08:26 PM   #110
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So we could just adapt many types of bipolar pairs?
depending on the specs.
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