Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

STK4050
STK4050
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th December 2017, 08:10 PM   #1
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Default STK4050

Hello,
I have few questions about STK4050 amplifier.
1. Does STK4050 gives 200w @ 8ohms. Is this RMS?
2. What are the differences between STK4050V and STK4050II? Is pin geometry the same? I`m asking this so I can make the blueprint in EAGLE to design PCB.
3.Do any of you have STK4050 library file for EAGLE?
4.How can I tell if STK4050 is original or copy? I will buy from e-bay.
5.What rating transformer do I need for running 2 STK4050? On one site I found 2 x 48v and at least 500VA so at least 1000VA for 2 STKs?

Thank you for help
  Reply With Quote
Old 7th December 2017, 10:15 AM   #2
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Quote:
Originally Posted by diy1995 View Post
Hello,
I have few questions about STK4050 amplifier.
1. Does STK4050 gives 200w @ 8ohms. Is this RMS?
2. What are the differences between STK4050V and STK4050II? Is pin geometry the same? I`m asking this so I can make the blueprint in EAGLE to design PCB.
3.Do any of you have STK4050 library file for EAGLE?
4.How can I tell if STK4050 is original or copy? I will buy from e-bay.
5.What rating transformer do I need for running 2 STK4050? On one site I found 2 x 48v and at least 500VA so at least 1000VA for 2 STKs?

Thank you for help
Do not buy!!!
Today ALL are fake!
  Reply With Quote
Old 7th December 2017, 03:16 PM   #3
Piersma is offline Piersma  Netherlands
diyAudio Member
 
Piersma's Avatar
 
Join Date: Jan 2003
Location: Netherlands
Default STK4044

If you choose the 100W STK Sanyo version, then there are still some genuine parts on Ebay. I have tested the STK4044 recently. Performance even better then stated in the datasheet.

STK4044 Power up.
  Reply With Quote
Old 7th December 2017, 03:53 PM   #4
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Quote:
Originally Posted by thimios View Post
Do not buy!!!
Today ALL are fake!
Wow.
That's so bad.
I will try to found used one than, do you think that fakes are realy that bad?
  Reply With Quote
Old 7th December 2017, 03:54 PM   #5
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Quote:
Originally Posted by Piersma View Post
If you choose the 100W STK Sanyo version, then there are still some genuine parts on Ebay. I have tested the STK4044 recently. Performance even better then stated in the datasheet.

STK4044 Power up.
I could, but I want more power
  Reply With Quote
Old 7th December 2017, 03:57 PM   #6
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Are there any similar ICs that will give 200w at 8ohm and can be buyed original?
  Reply With Quote
Old 7th December 2017, 07:52 PM   #7
44250 is offline 44250  Serbia
diyAudio Member
 
44250's Avatar
 
Join Date: Jan 2011
Location: Ugrinovci-Zemun-Belgrade-SERBIA
Send a message via AIM to 44250
better to aim for some solid state amplifier with transistors in output, my opinion. many amplifiers can achieve wanted results here.
__________________
Chop your own wood and it will warm you twice
  Reply With Quote
Old 8th December 2017, 07:53 PM   #8
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Hello,
I found Sharp Sc-8800 (it has 2x STK4050) that somebody is selling near me for 160EUR. So I`m buying that one. It`s an old unit, but I will repleace all capacitors and some other parts if necessary. The seller wrote that it sounds good.
At the cost of all the components I`m better of buying this Sharp.

However I already ordered parts for my STK442-090 build. I was ready to build something so I will I have original STK442-090, heatsink and transformer for it.
I will use arduino for VU meter and for volume control (I have leftover potentiometer mounted to servo, so I can also use remote controller to adjust the voltage).


I measured transormer and it`s 31-0-31, if I multiply 31v by 1,4 i get 43,4vdc.
However this is without load, what voltage drop can I expect? Transformer is 150VA.
STK422-090 max voltage suply is +-47 with 6 or 8ohm load, but all the measurements for the datasheet were measured at +-35v. Is it safe to run it with this transformer?
  Reply With Quote
Old 9th December 2017, 01:56 AM   #9
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
What the numbers are telling you is that the amplifier is OK with up to +/-47V rails if used on nominal 8 ohm speaker loads. I doubt it would cope with 6 ohm loads for long in typical amplifier builds. If you use 4 ohm speakers (or parallel 8 ohm speakers) you will need to reduce the supply voltage, probably to the rated +/- 35V or below, to keep the module's dissipation within safe limits. This assumes a specified or recommended amount of heatsinking and ventilation, which is equally important to power ratings.

A 150VA transformer will not be enough for a 100W RMS continuous power rating stereo amplifier though. If you are serious about that 100W power rating, I would not be messing with hybrid modules or small transformers in any case.

Hybrid audio power modules are long obsolete and the types you can still buy are mostly cheaply assembled, after-market replacement types or refurbs and these are all "fakes" in comparison to Sanyo's original parts. As Piersma mentioned though, there are a few replacement types that are of comparable quality but how can you be certain of this if you buy from unknown sellers on the internet? In some applications that are not subject to heavy use or abuse, some of these products have indeed proved to work ok - just don't expect many of them to meet the original specs or perform like the original products.

The voltage drop of any transformer depends on type and size. A 150VA toroidal transformer will typically have a regulation of about 8% drop between zero and full rated load. A conventional E-I transformer will vary much more, depending on the specific design and materials quality. Using a smaller transformer with poor regulation, to limit the power output to heavy loads, is not a bad idea and this was often done by manufacturers as a safety measure and for cost reduction. The design of such an amplifier that does not also sound compressed and weak in normal use though, is not so simple.
__________________
If only I had listened....
  Reply With Quote
Old 9th December 2017, 02:23 AM   #10
diy1995 is offline diy1995
diyAudio Member
 
Join Date: Jan 2017
Location: Slovenia
Quote:
Originally Posted by Ian Finch View Post
What the numbers are telling you is that the amplifier is OK with up to +/-47V rails if used on nominal 8 ohm speaker loads. I doubt it would cope with 6 ohm loads for long in typical amplifier builds. If you use 4 ohm speakers (or parallel 8 ohm speakers) you will need to reduce the supply voltage, probably to the rated +/- 35V or below, to keep the module's dissipation within safe limits. This assumes a specified or recommended amount of heatsinking and ventilation, which is equally important to power ratings.

A 150VA transformer will not be enough for a 100W RMS continuous power rating stereo amplifier though. If you are serious about that 100W power rating, I would not be messing with hybrid modules or small transformers in any case.

Hybrid audio power modules are long obsolete and the types you can still buy are mostly cheaply assembled, after-market replacement types or refurbs and these are all "fakes" in comparison to Sanyo's original parts. As Piersma mentioned though, there are a few replacement types that are of comparable quality but how can you be certain of this if you buy from unknown sellers on the internet? In some applications that are not subject to heavy use or abuse, some of these products have indeed proved to work ok - just don't expect many of them to meet the original specs or perform like the original products.

The voltage drop of any transformer depends on type and size. A 150VA toroidal transformer will typically have a regulation of about 8% drop between zero and full rated load. A conventional E-I transformer will vary much more, depending on the specific design and materials quality. Using a smaller transformer with poor regulation, to limit the power output to heavy loads, is not a bad idea and this was often done by manufacturers as a safety measure and for cost reduction. The design of such an amplifier that does not also sound compressed and weak in normal use though, is not so simple.
Hello,
I have transformer and original samsung wb-650. Samsung was playing nice until it did... (mobo problem) so I think it should do it. I`m not sure about transformer because it has no rating on it but on the back of samsung was writen 150w...
  Reply With Quote

Reply


STK4050Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My STK4050 amp. CECCO Chip Amps 21 7th November 2015 03:24 PM
stk4050 parallel Hannes.Soobik Solid State 5 25th November 2008 06:07 PM
help with STK4050 skobo Chip Amps 4 14th June 2005 02:34 AM


New To Site? Need Help?

All times are GMT. The time now is 10:40 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki