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Old 3rd June 2003, 04:36 AM   #1
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Default help identify'n a part ???

well it looks like a huge *** fet kinda
there are two of them
out of a home receiver
about 2.5 or 3 " wide
about 1.5" tall

numbers on the tops of them are

stk401-130
stk401-140

are these worth scrapping
or can they be used to my advantage in building an amp?
i was just looking through my scrap pile and saw these huge mofo's

in what i beleive was the amp part of an old fisher home receiver

well guys let me know if you know anything about em
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Old 3rd June 2003, 05:55 AM   #2
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These are hybrid amplifier chips, made by Sanyo. I'm not sure if they are single, or dual channel chips. The 130 and 140 at the end of the number is the power rating. Being 130 and 140 watts respectively. Someone on here might have the pinout for these. I believe all you need is a power supply and some capacitors to make them work as an audio power amplifier...
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Old 3rd June 2003, 06:13 AM   #3
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Here's a good datasheet. It is for all of the STK401-*** devices. They all have the same pinout and design, just different power ratings. The parts you need for the chips you have are the same for the one in the datasheet. The datasheet suggests a good power supply voltage for each type of chip in the line and also specifies the power output for each one.

I hope this helps!
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Old 3rd June 2003, 08:47 AM   #4
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so can i use them as an amp i realy wanna try to build something
i have the heatsink they were connected too
its huge
could i build a decent amp out of these that could drive a subwoofer?

if so anyone got any schematics for me remember im a noob for now but have been digging and reading deep into the forum so that i wont have as many questions
but i will still have alot

btw thanx but i think you may have forgotten the link duo
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Old 3rd June 2003, 11:28 PM   #5
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Hello again, sorry about that schematic, I do that often. I'm at school right now so you'll have to wait untill I get home to find the schematic on my machine again. I'll post it when I'm there.

Yes, you can make an amp out of these. Each chip has two channels. This means you can make a 4 channel amp, or maybe bridge the channels of each chip and have a two channel amp. The only problem is that you can't bridge the chips together, you can only bridge the channels of the same type and power rated chips. This means that if you bridge the channels of one chip and then the channels of the other, you'll have one channel more powerful than the other.

These will work on subwoofers but are better on full range speakers. I guess depending on your setup and subs to use, the amps will be fine on subwoofers but just won't give a ton of power at that frequency. At mid and high, they will give you much more SPL.

Anyway, I'll get you the schematic and datasheets when I get home tonight and post them on the forum.

These are good chips to use for a first project in my opinion. They are very simple to build into an amp. All they need is a power supply and some input, output, and biasing circuitry. Which is all done for you conveniently in the datasheet.
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Old 3rd June 2003, 11:36 PM   #6
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thank you

you have been much help so far
so how much power do you think i could get out of these chips

i guess i could make it a 4 channel amp and bridge down to two channels

the sub i have has dual 4 ohm voice coils
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Old 3rd June 2003, 11:37 PM   #7
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jeeze im getting tired of this moderation stuff
i got enough post
im not flaming
or being rude
take away this moderation
its taking me a day to get simple questions answered
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Old 4th June 2003, 03:44 AM   #8
Duo is offline Duo  Canada
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Well, I'm home now. Here's the datasheet http://www.datadart.com/al/sanyo/STK401-020.pdf

It's a good one with schematics and everything.
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