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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 26, 2013 5:05 pm Post subject: |
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| Nashou66 wrote: | Thanks Barclay, HWat is your Name anyway?
I'll try to take pics of the board later today. I wish I has schematics.
But from 80 watts to 200 should be a nice improvement in control of the driver at least. And the lower distortion is what I like best.
But As mac says, the STK's are junk amps. But For a sub I think Its ok, never would use them in a stereo amp design.
Athanasios |
They are even worse for power grabbing subs.
Let me just stress this 1 more time. The transformer is the key here. If it doesn't have enough power output your wasting your time. Finding transformer specs is a daunting task. From what little I was able to find I believe that MG-200 is a 200 watt supply, yet I could not find it's AC output anywhere.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Jan 26, 2013 6:38 pm Post subject: |
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| macgyver655 wrote: | | Nashou66 wrote: | Thanks Barclay, HWat is your Name anyway?
I'll try to take pics of the board later today. I wish I has schematics.
But from 80 watts to 200 should be a nice improvement in control of the driver at least. And the lower distortion is what I like best.
But As mac says, the STK's are junk amps. But For a sub I think Its ok, never would use them in a stereo amp design.
Athanasios |
They are even worse for power grabbing subs.
Let me just stress this 1 more time. The transformer is the key here. If it doesn't have enough power output your wasting your time. Finding transformer specs is a daunting task. From what little I was able to find I believe that MG-200 is a 200 watt supply, yet I could not find it's AC output anywhere. |
Right for the higer output STK's they suggest the MG-250. But as barclay says I'll go larger, most likely 300-400.
Athanasios
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 26, 2013 8:26 pm Post subject: |
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When your ready for all the info you need, let me know....
But you have to ask REEEAL nice....... 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Jan 26, 2013 9:25 pm Post subject: |
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| macgyver655 wrote: | When your ready for all the info you need, let me know....
But you have to ask REEEAL nice....... |
Thanks Mac.
I Also googled the MG-200-250. Nothing. And the same for the numbers on the Transformer in the pictures.
I have no idea what it is. But i'll look for a center tap 300 watt with at least 50-60 volt secondaries.
So Pretty please with an AR 15 on top can you help me Mac 
Athanasios
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 26, 2013 9:43 pm Post subject: |
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Hahaha, I actually think your current transformer may be enough.
What I did find are the schematics for the velodyne with a 150w amp design. It uses the STK4040ii. If you follow the schematic for the PS and amp circuit and apply all changes to yours it should output 150 watts. Nice and simple.... 
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Velodyne FSR-12 Schematic.pdf |
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Sat Jan 26, 2013 10:05 pm Post subject: |
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| Nashou66 wrote: | | Thanks Barclay, What is your Name anyway? |
See the PM I've sent...
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Jan 26, 2013 10:11 pm Post subject: |
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| macgyver655 wrote: | Hahaha, I actually think your current transformer may be enough.
What I did find are the schematics for the velodyne with a 150w amp design. It uses the STK4040ii. If you follow the schematic for the PS and amp circuit and apply all changes to yours it should output 150 watts. Nice and simple.... |
Your right for that STK !! Now, the one I would like to use is the 4046Xi which is 100 watt and it recomends 51 volts. do you think I could try it with only the 45?
Ok Barclay, I'll check PM
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 26, 2013 10:13 pm Post subject: |
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| Nashou66 wrote: | | macgyver655 wrote: | Hahaha, I actually think your current transformer may be enough.
What I did find are the schematics for the velodyne with a 150w amp design. It uses the STK4040ii. If you follow the schematic for the PS and amp circuit and apply all changes to yours it should output 150 watts. Nice and simple.... |
Your right for that STK !! Now, the one I would like to use is the 4046Xi which is 100 watt and it recomends 51 volts. do you think I could try it with only the 45?
Ok Barclay, I'll check PM
Athanasios |
Why would you not want to go with the 4040 and get 150 watts?
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Sat Jan 26, 2013 10:29 pm Post subject: |
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| Nashou66 wrote: | | Your right for that STK !! Now, the one I would like to use is the 4046Xi which is 100 watt and it recomends 51 volts. do you think I could try it with only the 45? |
Hi,
Of course You can. But -as Macgyver mentioned- the transformer is key. You won't be able to get more power out of the system if it isn't supplied by its transformer. Of course You can improve the impulse behaviour by increasing the capacitors at the supply lines (short term power supplied by the capacitors) but You might need to replace the main fuse due to higher currents present during powering up (larger charge current due to larger capacity). But in general the output wattage is defined by the wattage of the amp's power supply minus the losses in the amplifier circuit.
It always makes me laugh when I see the absurdingly high PMPO power ratings at some of the true cheapo gear. Even when its design clearly indicates much much lower REAL power ratings. It's like You would have found a way to defy gravity by hopping all over the place...
Regards,
barclay66
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Jan 26, 2013 10:52 pm Post subject: |
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| macgyver655 wrote: | | Nashou66 wrote: | | macgyver655 wrote: | Hahaha, I actually think your current transformer may be enough.
What I did find are the schematics for the velodyne with a 150w amp design. It uses the STK4040ii. If you follow the schematic for the PS and amp circuit and apply all changes to yours it should output 150 watts. Nice and simple.... |
Your right for that STK !! Now, the one I would like to use is the 4046Xi which is 100 watt and it recomends 51 volts. do you think I could try it with only the 45?
Ok Barclay, I'll check PM
Athanasios |
Why would you not want to go with the 4040 and get 150 watts? |
The 4046 is 100W but its a split power supply. the 4032 that is in there now is a 40 watt but the amp puts out 80. The split power supply doubles it I guess? Not sure how that works.
The 4046 should get me 200 watts, but as barclay Says it really wont be. But it might go a bit higher that the 4040.
I d have to try it and find out I guess.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 26, 2013 11:13 pm Post subject: |
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They are all split power supplies as are many power amps. All that means is that the power supply has a positive and negative rail with ground being pulled from a center tap winding. So any device you can think of that requires a pos and neg rail is a split PS.
It's the design of the circuit which enables the different wattage outputs. And without specific engineering design skills on the specific type of circuits, it can be a fruitless endeavor.
This is why I suggested an already proven design.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Jan 27, 2013 3:59 am Post subject: |
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Ok Mac thanks on the split power supply explanation. That makes more sense to me now.
I'll look at the PCB layout for the amp section and see how close it it to the FSR series. Mine has a fixed cross over of 80hz.
It only has a volume control , and no Phase switch either.
Not sure what features the FSR has. I do remember tho it was like 3 times the cost on my VA series.
Thanks Guys!
Nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
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