Wow. That explains the high current when we turn on the amp.
I was thinking they were good, because they looks good. Huge mistake from my part. I will change them now.
Here is the Diodes results:
Upper side:
D3: ~815 Ohms
D4: ~639 Ohms
D5: ~653 Ohms
Lower side:
D6: ~660 Ohms
D7: ~639 Ohms
D8: ~801 Ohms
I was thinking they were good, because they looks good. Huge mistake from my part. I will change them now.
Here is the Diodes results:
Upper side:
D3: ~815 Ohms
D4: ~639 Ohms
D5: ~653 Ohms
Lower side:
D6: ~660 Ohms
D7: ~639 Ohms
D8: ~801 Ohms
For future reference, probe placement on the terminals of a diode is important.
None read near 0 ohms so they may be OK.
It appears that your soldering iron may not be getting enough heat to the terminals. Cut the legs of the old FETs and remove them one at a time. Heat the board from the side that has the most copper for the terminal and remove the terminal when the solder is molten. Adding new solder before desoldering is generally helpful.
None read near 0 ohms so they may be OK.
It appears that your soldering iron may not be getting enough heat to the terminals. Cut the legs of the old FETs and remove them one at a time. Heat the board from the side that has the most copper for the terminal and remove the terminal when the solder is molten. Adding new solder before desoldering is generally helpful.
Perry.
Sure. I will do that on the future.
I will do too a better soldering job when i finish this amp. I will buy a better soldering iron later.
About the amp, well.. i changed all the FETs (i tested and no more shorted FETs) and the problem still happens.
Still the same problems: Noises on the toroid and very high current consumption.
Sure. I will do that on the future.
I will do too a better soldering job when i finish this amp. I will buy a better soldering iron later.
About the amp, well.. i changed all the FETs (i tested and no more shorted FETs) and the problem still happens.
Still the same problems: Noises on the toroid and very high current consumption.
Do all of the power supply gate resistors now read approximately 47 ohms?
Yes Perry.
Did you replace the 0.33 ohm resistor that was reading 8k ohms?
Perry,
Yes.
The resistance on this resistor is now within the tolerance.
Hi,
I removed the right leg of all bipolar transistors (MJE 4353's) on the upper side:
I tried to turn on the amp with the current limiter, and nothing. Still the noise and high current consumption.
And, i can see one of this transistors are shorted, the one i've changed the resistor:
I removed the right leg of all bipolar transistors (MJE 4353's) on the upper side:
I tried to turn on the amp with the current limiter, and nothing. Still the noise and high current consumption.
And, i can see one of this transistors are shorted, the one i've changed the resistor:
An externally hosted image should be here but it was not working when we last tested it.
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