higher voltage than BC550/560?

kubeek · 11th September 2006, 08:35 PM

Hello,

Could anyone please suggest some low-noise transistor complimentary pair with higher C-E voltage than the BC550/560?
Thanks

I just have seen one 550 died in a circuit where there should be voltage of max 40V across it, it ended with B-E short circuit...

darkfenriz · 11th September 2006, 08:38 PM

bc546/bc556
2sa970/2sc2240
2n5401/2n5551

kubeek · 11th September 2006, 08:43 PM

darkfenriz: that was quite quick, thanks again!

Netlist · 11th September 2006, 08:44 PM

Does it have to be low noise?

/Hugo

kubeek · 11th September 2006, 08:46 PM

It would be better, current source in diff stage should not be too noisy, right?

Netlist · 11th September 2006, 08:51 PM

Then 2sa970 / 2sc2240 would be a good choice.

/Hugo

kubeek · 11th September 2006, 09:19 PM

From the datasheets it seems to me that all thees transistors are similar in terms of noise:
BC550 - noise figure 1.4 - 3 dB
2SA970 - 2 - 6 dB
2N5551 - max. 8dB

so there is no big difference (is the noise figure the right parameter to look for?)

AndrewT · 12th September 2006, 04:18 PM

How about 872/1775 available in 90 or 120Vce0.

kubeek · 12th September 2006, 04:42 PM

What is the prefix of these? I am not too familiar with probalby japan numbering.

jacco vermeulen · 12th September 2006, 04:50 PM

2SA872, 2SC1775

The 1775A was a favorite of Hiraga/L'audiophile but you will find it harder to source.

11th September 2006, 08:35 PM	#1
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	higher voltage than BC550/560? Hello, Could anyone please suggest some low-noise transistor complimentary pair with higher C-E voltage than the BC550/560? Thanks I just have seen one 550 died in a circuit where there should be voltage of max 40V across it, it ended with B-E short circuit...

12th September 2006, 04:18 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	How about 872/1775 available in 90 or 120Vce0. __________________ regards Andrew T.

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11th September 2006, 08:38 PM	#2
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	bc546/bc556 2sa970/2sc2240 2n5401/2n5551

11th September 2006, 08:43 PM	#3
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	darkfenriz: that was quite quick, thanks again!

11th September 2006, 08:44 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	Does it have to be low noise? /Hugo

11th September 2006, 08:46 PM	#5
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	It would be better, current source in diff stage should not be too noisy, right?

11th September 2006, 08:51 PM	#6
Netlist diyAudio Moderator Join Date: Jan 2003	Then 2sa970 / 2sc2240 would be a good choice. /Hugo

11th September 2006, 09:19 PM	#7
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	From the datasheets it seems to me that all thees transistors are similar in terms of noise: BC550 - noise figure 1.4 - 3 dB 2SA970 - 2 - 6 dB 2N5551 - max. 8dB so there is no big difference (is the noise figure the right parameter to look for?)

12th September 2006, 04:42 PM	#9
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	What is the prefix of these? I am not too familiar with probalby japan numbering.

12th September 2006, 04:50 PM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	2SA872, 2SC1775 The 1775A was a favorite of Hiraga/L'audiophile but you will find it harder to source.

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