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Punch 500a2 distorted channel
Punch 500a2 distorted channel
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Old 13th January 2011, 10:00 PM   #31
chipper is offline chipper  United States
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Also im searching for a device to remove the no good parts from the mesha. Do you know something cheap i can use? I know you posted on a another post to use a butane torch? But i can't find them.
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Old 13th January 2011, 10:13 PM   #32
Perry Babin is offline Perry Babin  United States
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Lowes, Amazon and eBay all have the ST250K torch.

I know nothing about futurlec.
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Old 13th January 2011, 11:42 PM   #33
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Lowes, Amazon and eBay all have the ST250K torch.

I know nothing about futurlec.
Where else can i find IRF3205? Mouser doesn't have them in stock and i looked on digikey they don't seem to have them.
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Old 14th January 2011, 01:45 AM   #35
chipper is offline chipper  United States
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okay i've got new outputs by "Vishay" and 8 IRF3205s i got 4 more just in case something should happen, which i hope i make it right the first time. All i got to do is get the butane torch & 47 ohm gate resistors.

Oh and is 12 ohms 'normal' for the gate resistors on the outputs? When the bad fets were in the circuit they were reading 8 ohms now they read 11 or 12 ohms.
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Old 14th January 2011, 10:44 AM   #36
Perry Babin is offline Perry Babin  United States
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They should read 10 ohms 5%. Remember to subtract whatever your meter reads with the probes shorted together from what it reads across the resistors.
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Old 14th January 2011, 09:14 PM   #37
chipper is offline chipper  United States
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May i ask how does the switching power supply? Like if you can explain the basic info on it? The center leg of the FET is driving the three winding of the transformer, right? And i'd like to know how does the MOSFET work in here? It all seems very interesting to me.
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Old 14th January 2011, 09:17 PM   #38
Perry Babin is offline Perry Babin  United States
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Have you read the following page:
Basic Switching Power Supply Design Tutorial
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Old 17th January 2011, 12:27 AM   #39
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Have you read the following page:
Basic Switching Power Supply Design Tutorial
Perry, i noticed Q123 gets very hot it's located near the driver transistor on the left channel, the other on the right channel stays cool. I was going to just install the outputs in asap but the i noticed that Q123 is gets hot and i'm not sure if i should replace or what?? I have not received the parts yet but i'm using test FETs for meanwhile.
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Old 17th January 2011, 12:33 AM   #40
chipper is offline chipper  United States
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Oh never mind i found alittle more damage it looks like Q121 is burned marked "2A".
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