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Old 30th September 2009, 01:52 PM   #11
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58 +/- volts ac correct?
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Old 7th July 2011, 12:02 PM   #12
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Hi guys, looking to work with the STK4050 amp. Im also relitively inexperienced but ive built a couple small amps. Wondering is it possible to regulate a transformet, or how would you regulate a supply so that it can deliver +-66v to the stk4050?
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Old 7th July 2011, 04:43 PM   #13
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how would you regulate it down to 66V const. Im also looking at building one of these amps.
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Old 18th July 2011, 06:36 PM   #14
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Hi billbo, is veroboard robust enough to be able to handle the power riquired by the stk 4050?
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Old 18th July 2011, 07:26 PM   #15
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Regulating a power supply
a) is expensive.
b) wastes electricity, because it converts the surplus voltage times the current draw into heat.
c) strangles your amp when it most needs to breath freely.

If you look at the datasheet, you will see that the specs were tested with a power supply that had a no-load voltage of 80 V and sagged to 66 V when loaded with an 8 Ohm resistor at 200 W output power. That is a good clue how to choose your transformer.
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Old 19th July 2011, 03:10 PM   #16
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Default STK4050

Thanks for the info, so to get around +-80V unloaded and +-66V loaded would it be suitable to use a 55-0-55V transformer?(80/sqrt2=55) approx?
Also, how many va should the transformer be for a single channel, would 300va be enough?
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Old 19th July 2011, 07:11 PM   #17
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Quote:
Originally Posted by noubar View Post
I'm building a power amplifier right now, it will be the 3rd one i build and i'm only 16 years old so i'm not a pro...

i've already tried a 2 ohm load on stk4048 IC's (150W RMS @ 8 Ohm) and it worked fine even at full power so my question is will the stk4050 IC (200W RMS @ 8 ohm) can handle a 2ohm load so i can bridge two of them and use a 4 ohm load...?

i need a little help as i don't know what pre-amp IC's to use to invert the signal of one channel and to keep the same gain at the other channel...

i also have to ask about the transformer as in the datasheet it is said that the stk4050 can handle 95V but the recommended voltage is 66V so i'm a little confused because i've already used a 60V (30V+30V) transformer for the stk4048 IC... so i was thinking to build a 90V (45V+45V) transformer for the stk4050 but i'm afraid to burn the stk4050 out...
i have good heatsink i never had overheating before, i always use fans so everytime i touch the heatsink it's cold even when the amp is running at full power (stk4048 amp). So does anyone have an idea how i can get the best power performance and without burning everything out...?

Thanks!
Did you build a soft start circuit for your amp? Will it be neccessary for the STK4050?
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Old 5th April 2013, 01:33 PM   #18
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if can drive stk4050 a 1pc 18" subwoofer????? i already build stk4048 it is a powerfull amp my 12" speaker wa burn out ,. and the 15" inch is getting hot when i over drive the power of the stk 4048
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Old 29th September 2013, 06:48 AM   #19
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Default Trying to troubleshoot stk4050V circuit

For some reason, the 100 ohm resistor between pins 14 and 15 burned-out. I replaced this resistor, but when I switch power on, this resistor just burns out. Is the stk4050 failing or should I be looking at something else?
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