i'm not so good in my english.
I have a probleme with this amp ETI-480 100W
in my pic is some detail
the under side of the board looks bad that the flux from the soldering none of that lines
are shorting. I'm 100% sure.
The probleme is with the finishing part the 100 ohm resistors it's getting F... hot and starts smoking.
and i can find the fault.
i had built 5 of them all the same problem just this one are going to use external
transistors with wires conected to the board from the heatsink
becuase if got a space problem in a box.
please help anyone ???
I have a probleme with this amp ETI-480 100W
in my pic is some detail
the under side of the board looks bad that the flux from the soldering none of that lines
are shorting. I'm 100% sure.
The probleme is with the finishing part the 100 ohm resistors it's getting F... hot and starts smoking.
and i can find the fault.
i had built 5 of them all the same problem just this one are going to use external
transistors with wires conected to the board from the heatsink
becuase if got a space problem in a box.
please help anyone ???
Attachments
Tube_Dude said:Hi Jacquesl
There is a fatal mistake in the schematic and in your pics, the power supply , must be connected to the power transistors side of the PCB .
Is the current that goes to the output stage , that burn the 100 ohms resistor...
This one is to easy...
Regards
Connect the power to the other side of the resistors
I've got the same problem... But I figured it out before puting some power on it
Olá t_dude
Here are my 4 amps none of them work
problem
100 ohm resistors burn out
The voltages are +- 30 volt over the 100ohm resistors
If I put the all two fuses in R15 burn out
but if i take R14 and R18 out the 100 ohms dont get hot.
so if anyone also had the same problem please post a reply
problem
100 ohm resistors burn out
The voltages are +- 30 volt over the 100ohm resistors
If I put the all two fuses in R15 burn out
but if i take R14 and R18 out the 100 ohms dont get hot.
so if anyone also had the same problem please post a reply
Attachments
jacquesl said:Here are my 4 amps none of them work
problem
100 ohm resistors burn out
The voltages are +- 30 volt over the 100ohm resistors
If I put the all two fuses in R15 burn out
but if i take R14 and R18 out the 100 ohms dont get hot.
so if anyone also had the same problem please post a reply
Make sure all transistors are installed correctly then measure the junctions of all transistors.
If all of your amplifiers are doing the same thing, you have made an error somewhere. You've probably made the same error on all amplifiers.
Before going any further, replace the 100 ohm resistors with fuses and then power the circuitboards through current limiting resistors. Insert the resistors at the point where your + 30 and - 30 volts connect. You might even use a couple of low wattage light bulbs rather than current limiting resistors. That will give you a visual indication of an over-current situation.
Good luck and report back with your results.
frank, if you seeing the problem please tell me becuase i give up.
this is my 10th day of crap with this amp.
I'm going to unicom monday to a tv repair dude and ask him if he can help me.
the resone i built this amp is that someone give me a marantz amp that dont work, so i finded the fault, its the power amp section the rest work thank god.
model 1060
its has crappy old confusing parts in but if mastered it after 2 hours
this is my 10th day of crap with this amp.
I'm going to unicom monday to a tv repair dude and ask him if he can help me.
the resone i built this amp is that someone give me a marantz amp that dont work, so i finded the fault, its the power amp section the rest work thank god.
model 1060
its has crappy old confusing parts in but if mastered it after 2 hours
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