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Old 3rd February 2009, 01:43 AM   #1
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Default 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
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Old 3rd February 2009, 09:28 AM   #2
lineup is offline lineup  Sweden
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Are you sure about
Toshiba SB552 and SD552
I can not find those
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Old 3rd February 2009, 09:58 AM   #3
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Default 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
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Old 3rd February 2009, 11:16 AM   #4
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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.
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Old 3rd February 2009, 01:00 PM   #5
lineup is offline lineup  Sweden
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Default Re: 57 years oldtimer .....

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
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Old 3rd February 2009, 01:04 PM   #6
lineup is offline lineup  Sweden
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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.
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Old 3rd February 2009, 01:14 PM   #7
wg_ski is offline wg_ski  United States
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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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Old 3rd February 2009, 01:41 PM   #8
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Default the all thing smells

ADCOM !!!!!! yammi yammi yammi !!!!!
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Old 3rd February 2009, 04:35 PM   #9
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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
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