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Old 13th March 2008, 02:51 AM   #1
haseeb is offline haseeb  India
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Arrow BC560C in india

I would like to know if BC560C PNP Transistors are available india(chennai).
I am stuck with my Power amplifier project using 2sj162/2sk1058 MOS.
Transistor source advice is appreciated.
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Old 13th March 2008, 03:25 AM   #2
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Old 13th March 2008, 07:06 PM   #3
haseeb is offline haseeb  India
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Thanks Sam for responding.

I need bc560c a minimum quantity.

I could not mail you as this is my first post here.
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Old 13th March 2008, 07:27 PM   #4
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There are better small-signal PNP transistors available:

2sa992 (if you need beta > 400, and linearity)
2sa970 (highly linear)
2sa1015 (inexpensive and highly linear)
bf421/423 (inexpensive, fast and Vceo > 200 V)
mpsa92/93
2n5401

or just plain
bc558 (inexpensive, widely available, and audibly indistinguishable from bc560c)
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Old 13th March 2008, 09:07 PM   #5
haseeb is offline haseeb  India
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Thanks for the suggession.

well, I am looking for the low noise version.

Vceo is not an issue to me,its ok even vce is max 50v.

I know there are many similar PNP's but I am very much concerned about the Nfe and max Nfe should be > 2db.

If I use substitute ,I think I need to change the passive components as per its electrical characteristics ,if I am wrong please correct me.
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Old 13th March 2008, 09:26 PM   #6
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I have BC546C and BC556C if you are interested.

http://www.fairchildsemi.com/ds/BC/BC556.pdf
http://www.fairchildsemi.com/ds/BC/BC546.pdf

Probably has the higher noise figure no influence at all. It depends whether the design is optimized regarding the noise. If you'll get 114 or 112 S/N will not be particulary important.
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Old 14th March 2008, 07:33 AM   #7
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> Vceo is not an issue to me,its ok even vce is max 50v.

Then you can't do much better than the 2sa1015, which is inexpensive and widely available in most gain grades, including original Toshiba-manufactured devices.

> I am very much concerned about the Nfe and max Nfe should be > 2db.

The noise figure is only of significance in a preamp for moving-coil pickup or similar low-amplitude input. It has little or no significance for a power-amp, even for an LTP input stage. You will find that you will get better improvements on audible thermal noise by switching to metal-film resistors in place of carbon composition resistors, etc. You won't find an audible difference between a bc558c and bc560c in most audio applications - they're just differently graded bins of the same device.

Moreover, 2sa992 and a970 are comparable to or better than the bc560c on NF, hFE as well as Ic/Ib linearity.

> If I use substitute ,I think I need to change the passive components as per its electrical characteristics ,if I am wrong please correct me.

If it's a well designed circuit, there should be no dependence on any transistor parameter, not even the beta. Any small-signal PNP with the appropriate values for Ic/Vceo should be a drop-in replacement for the bc560c without any change in the passives. The only thing that I can think off is that if the circuit is at the edge of stability, than the compensation may sometimes have to be tweaked to maintain stability if you're using a faster transistor in place of a slower one.
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Old 14th March 2008, 09:54 PM   #8
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Linuxguru,

Your post is impressive.

Good catch on Noise figure, "no significance for a power-amp".

I accept your suggession .

I am planning to go with 2sa1015 can you please tell me what is exact complimentary NPN for 2sa1015 ?.

some where on the net I found the equivalence for bc560c is 2N5087 , what's your suggession keeping indian retailers in mind ?.I know, now again speaking of bc560c makes no sense ,but just a curiosity.

Can you elobarate "circuit is at the edge of stability" from your last post.

Regards,
Haseeb
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Old 14th March 2008, 10:30 PM   #9
es44 is offline es44  Denmark
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Quote:
Originally posted by haseeb

can you please tell me what is exact complimentary NPN for 2sa1015 ?.

Haseeb
According to Vrt-disk, it is 2SC1815.

Best regards
Ebbe
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Old 15th March 2008, 05:00 AM   #10
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> I found the equivalence for bc560c is 2N5087 , what's your suggession keeping indian retailers in mind ?

The Fairchild 2n5087 is a close equivalent with lower Icmax and fT, but otherwise very similar. However, I haven't checked for availability of this device in Bangalore or Chennai.

> Can you elobarate "circuit is at the edge of stability" from your last post.

If the amplifier circuit is at the threshold of breaking into oscillations, then substituting a higher gain device or faster device in place of the original lower gain or slower device, can sometimes cause the circuit to become unstable and break into oscillations.
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