2sa1302/2sc5200 Power Expected?

zox2003 · 16th March 2005, 07:21 PM

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

Amplifier construction:

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

Thanks.

edl · 16th March 2005, 07:36 PM

+/-40V rails means an 56V-CT trafo.

then you will get 100W sinus on 4ohm or 60W sinus on 8ohm.

zox2003 · 16th March 2005, 07:53 PM

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

Thanks

edl · 17th March 2005, 04:34 PM

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

Zero Cool · 18th March 2005, 01:29 AM

I have some amp modules that use 4 pairs and +/- 75VDC and the produce 220+ @ 8 and 350 or better @ 4 ohms.

Zc

anatech · 18th March 2005, 03:06 AM

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

jacco vermeulen · 18th March 2005, 12:03 PM

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.

K-amps · 18th March 2005, 01:36 PM

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.

sajti · 18th March 2005, 01:45 PM

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

zox2003 · 18th March 2005, 08:46 PM

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?

16th March 2005, 07:21 PM	#1
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	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) Thanks.

16th March 2005, 07:53 PM	#3
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	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). Thanks

18th March 2005, 12:03 PM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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. __________________ Not so much,.......if it says "ZM" in the corner.

18th March 2005, 08:46 PM	#10
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	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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16th March 2005, 07:36 PM	#2
edl diyAudio Member Join Date: Oct 2004	+/-40V rails means an 56V-CT trafo. then you will get 100W sinus on 4ohm or 60W sinus on 8ohm.

17th March 2005, 04:34 PM	#4
edl diyAudio Member Join Date: Oct 2004	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

18th March 2005, 01:29 AM	#5
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	I have some amp modules that use 4 pairs and +/- 75VDC and the produce 220+ @ 8 and 350 or better @ 4 ohms. Zc

18th March 2005, 03:06 AM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

18th March 2005, 01:36 PM	#8
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	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.

18th March 2005, 01:45 PM	#9
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	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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