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Old 16th March 2005, 07:21 PM   #1
zox2003 is offline zox2003  United States
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Default 2sa1302/2sc5200 Power Expected?

How much power I can expect from pair of this transistors on +/- 40V rails.

Amplifier construction:

TL081---tip29/30 (drivers)---2SA1302/2SC5200 ( OUTPUT)


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Old 16th March 2005, 07:36 PM   #2
edl is offline edl  Hungary
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+/-40V rails means an 56V-CT trafo.

then you will get 100W sinus on 4ohm or 60W sinus on 8ohm.
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Old 16th March 2005, 07:53 PM   #3
zox2003 is offline zox2003  United States
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Default Power on 4 ohms

Transformer is 2 x 30 V .Can I use pair of this on 4 ohms with this voltage ( approx. 2 X 41V DC).

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Old 17th March 2005, 04:34 PM   #4
edl is offline edl  Hungary
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hello

then with this trafo you'll get 110W sinus-power on 4ohm.
a pair of output devices would do the job, but because of the safe let's use 2 pairs of them by channel!

regards
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Old 18th March 2005, 01:29 AM   #5
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I have some amp modules that use 4 pairs and +/- 75VDC and the produce 220+ @ 8 and 350 or better @ 4 ohms.


Zc
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Old 18th March 2005, 03:06 AM   #6
anatech is offline anatech  Canada
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Hi zox2003,
Just curious. Are you using a normal emitter follower configuration? If so, your output swing is limited by the op amp power supply less a few volts. Mr TL081 will not survive much over bipolar 15VDC supplies so ...
-Chris
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Old 18th March 2005, 12:03 PM   #7
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Meaning you will need an extra gain stage between the opamp and the driver to have enough voltage gain to reach the 30vdc on the output.
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BOXES for crying out loud
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Old 18th March 2005, 01:36 PM   #8
K-amps is offline K-amps  United States
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Looking at the data sheets, the pair will not pass more than 0.4 amps at that rail voltages.... experience tells me 75 watts to 120 watts is possible with one pair if you push it.
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Old 18th March 2005, 01:45 PM   #9
sajti is online now sajti  Hungary
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If You design Your amplifier for maximum output (ie.. low rail losses), and the transformer can handle about 400-500VA, 75W/8ohms, and 120-130W 4ohms is possible. But I recommend to use two pairs for 4ohms!

sajti
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Old 18th March 2005, 08:46 PM   #10
zox2003 is offline zox2003  United States
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Default Power from Amplifier

I guess that with TL081 and emiter follower design I can reach 200W on 4 ohm with no problem ( 4 transistors-2 per rail).
Right?


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