I have a small plate amp. The transformer is 12V - 2.5A. I have damaged the smoothing capacitor which is 4700mF - 25V. Can I replace it with 3300mF - 50V?
Will it make any difference?
Will it make any difference?
If you substitute a lower value capacitor there will be less smoothing effect. Also, for power supply capacitors sometimes it is more than just the capacitance value the matters. For example, ESR, maximum ripple current, etc., can matter too. Better to look at the part number on the damaged cap and check its datasheet to see what characteristics it has. That would give a better idea about a suitable replacement.
A higher voltage rating is okay. If you just replace the cap as you propose, probably the plate amp will still work but maybe not as well as it should. Hard to say without knowing more.
A higher voltage rating is okay. If you just replace the cap as you propose, probably the plate amp will still work but maybe not as well as it should. Hard to say without knowing more.
With 12Vrms secondary you do not need more than 25V rated cap.
The size is usually at least 2000uF/1A, so 5000uF. 4700u will do.
So just replace with the same value or bigger (6800u) if it fits on the board.
The size is usually at least 2000uF/1A, so 5000uF. 4700u will do.
So just replace with the same value or bigger (6800u) if it fits on the board.
Thanks but I think I've done more damage than I initially thought. I knocked the amp off the table, after which it only made a buzzing sound. Output was intermittently normal if I wiggled the cap. I swapped the cap but I think the amp is dead now.
Maybe damaged a track to the capacitor ?
If you remove the cap you can inspect the tracks around it for damage.
If you remove the cap you can inspect the tracks around it for damage.
What is fried? Sorry, but I'm not seeing it. 😱
Although it does look like you need a heavier (higher wattage) soldering utensil than was used to solder the main filter capacitor.
Cheers
Although it does look like you need a heavier (higher wattage) soldering utensil than was used to solder the main filter capacitor.
Cheers
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Pah! That’s hardly even toasted, imminently fixable! 🙂
If you want fried I’ll dig out some car amplifier pcb photos, when they go they really go... 😀
If you want fried I’ll dig out some car amplifier pcb photos, when they go they really go... 😀