2SB552 & 2SD552 Applications

chrisnotton · 3rd February 2009, 12:43 AM

Ciao e tutti!

Genuine Toshi. 2SB552 & 2SD552 complimentary

I used to use these devices extensively consequently I have a large number of them lazily sitting round on heatsinks & in packs just gathering dust.

Anybody know of a really nice power-amp that I could build to use them up?

Pip pip

lineup · 3rd February 2009, 08:28 AM

Are you sure about
Toshiba SB552 and SD552
I can not find those

sakis · 3rd February 2009, 08:58 AM

line up ..... you should know to look for 2SB552.... and so on ....

chris ......with devices like the above you can built anything you want ....

you may produce amps from 40 -500 w easily

i think that they are very nice outputs
how many you have????? and what is the chance that i get some of them ?????

i am willing to pay or trade

thanks

jacco vermeulen · 3rd February 2009, 10:16 AM

Quote:

Originally posted by chrisnotton
use them

Beta of those Toshiba TO3's already starts to drop like a fly at a low collector output current level, much earlier than Motorola TO3 numbers.
Means any design with a triple darlington output stage, and plenty power devices in parallel.

lineup · 3rd February 2009, 12:00 PM

Quote:

Originally posted by sakis
line up ..... you should know to look for 2SB552.... and so on ....

you are right

My problem was that I searched for SB552
and not 2SB552

lineup · 3rd February 2009, 12:04 PM

I myself have one Kenwood Amplifier put away.
It has one broken shorcircuited output device.
The output power transistors are 2SB557 and 2SD427
I think they may be of similar sort.

wg_ski · 3rd February 2009, 12:14 PM

Actually, they are more similar to the D424/B554. Base ratings are the same, but characterization data is different (test conditions). Probably the same die. D427 is a lower power unit.

sakis · 3rd February 2009, 12:41 PM

ADCOM !!!!!! yammi yammi yammi !!!!!

chrisnotton · 3rd February 2009, 03:35 PM

Quote:

Originally posted by lineup
Are you sure about
Toshiba SB552 and SD552
I can not find those

Here you go lineup

http://www.datasheetarchive.com/2SB552-datasheet.html
&
http://www.datasheetarchive.com/2SD552-datasheet.html

The devices I have are mounted on large heatsinks. There is 15 of each per heatsink used to drive 3 motors swinginging them between +/- 40VDC from a 20A supply.

The file seems to be too big to upload so here is a link to the circuit: http://snipurl.com/b80pr

I don't know how well the circuit would work as an audio amp. Needs abit of d.c. protection

Pip pip

3rd February 2009, 12:43 AM	#1
chrisnotton diyAudio Member Join Date: Nov 2008	2SB552 & 2SD552 Applications Ciao e tutti! Genuine Toshi. 2SB552 & 2SD552 complimentary I used to use these devices extensively consequently I have a large number of them lazily sitting round on heatsinks & in packs just gathering dust. Anybody know of a really nice power-amp that I could build to use them up? Pip pip

3rd February 2009, 08:28 AM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Are you sure about Toshiba SB552 and SD552 I can not find those __________________ lineup

3rd February 2009, 08:58 AM	#3
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	57 years oldtimer ..... line up ..... you should know to look for 2SB552.... and so on .... chris ......with devices like the above you can built anything you want .... you may produce amps from 40 -500 w easily i think that they are very nice outputs how many you have????? and what is the chance that i get some of them ????? i am willing to pay or trade thanks __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

3rd February 2009, 12:04 PM	#6
lineup diyAudio Member Join Date: Dec 2005 Location: the north	I myself have one Kenwood Amplifier put away. It has one broken shorcircuited output device. The output power transistors are 2SB557 and 2SD427 I think they may be of similar sort. __________________ lineup

3rd February 2009, 12:41 PM	#8
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	the all thing smells ADCOM !!!!!! yammi yammi yammi !!!!! __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr


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3rd February 2009, 12:14 PM	#7
wg_ski diyAudio Member Join Date: Oct 2007	Actually, they are more similar to the D424/B554. Base ratings are the same, but characterization data is different (test conditions). Probably the same die. D427 is a lower power unit.

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