have 2 of these velodyne minivee subwoofers. 8"
one is producing bass but at very low volume levels.
moving volume knob up and down doesn't really help. volume level does not change. I seriously doubt its a dirty volume knob.
there are occasional popping noises. the driver jerks during pops.
visually things look ok. except 2 resistors that look like running hot.
hard to tell from pictures. but if you look close that part of the board is brownish. part where the 2 big blue resistors are and 2 similar smaller resistors.
anyone familiar with velodyne amplifier short cuts / optimizations. anyway to approximate wattage rating of those resistors?
a lot of people put more powerful resistors in velodyne amplifiers.
the large blue resistors are 16mm long and 5mm in diameter
small pair next to each other are 8mm long about 2.5mm in diameter
one is producing bass but at very low volume levels.
moving volume knob up and down doesn't really help. volume level does not change. I seriously doubt its a dirty volume knob.
there are occasional popping noises. the driver jerks during pops.
visually things look ok. except 2 resistors that look like running hot.
hard to tell from pictures. but if you look close that part of the board is brownish. part where the 2 big blue resistors are and 2 similar smaller resistors.
anyone familiar with velodyne amplifier short cuts / optimizations. anyway to approximate wattage rating of those resistors?
a lot of people put more powerful resistors in velodyne amplifiers.
the large blue resistors are 16mm long and 5mm in diameter
small pair next to each other are 8mm long about 2.5mm in diameter
Attachments
Last edited:
I have a Microvee module, they look similar.
Your resistances don't look bad.
But the white chip on the left seems a little yellowed, it looks like an optocoupler... Difficult to see the reference.
These modules are excellent in terms of power and hp control!
I use one, in a 2x12 inch subwoofer, it packs a punch!
On Ali...You can find new ones, these modules are known to be quite difficult to repair.
Your resistances don't look bad.
But the white chip on the left seems a little yellowed, it looks like an optocoupler... Difficult to see the reference.
These modules are excellent in terms of power and hp control!
I use one, in a 2x12 inch subwoofer, it packs a punch!
On Ali...You can find new ones, these modules are known to be quite difficult to repair.
https://www.diyaudio.com/community/attachments/dsc00003-jpg.1250512/
The capacitor on the right also seems to have gotten hot, I think it must be orange...
The capacitor on the right also seems to have gotten hot, I think it must be orange...
So yes the chip with 2x4 pins looks pretty brown .
Marked
0817:
TLP504A
The other chip with 2x3 pins looks ok
Labeled
4N25
813Q
The mica or film capacitor in question is interesting. Brown with small strip of green on top. Maybe paint. I'll compare with the working minivee
Labeled
F .22J
MD 63V
Marked
0817:
TLP504A
The other chip with 2x3 pins looks ok
Labeled
4N25
813Q
The mica or film capacitor in question is interesting. Brown with small strip of green on top. Maybe paint. I'll compare with the working minivee
Labeled
F .22J
MD 63V
Attachments
Replacing the optocoupler and the polypropylene capacitor should not do any harm, they are inexpensive components.
Sorry...I'm going back to watching the cooking pot! 🥣🍽️🍷🍵🍾
Sorry...I'm going back to watching the cooking pot! 🥣🍽️🍷🍵🍾
0817:
TLP504A
What do 0817 refer to. I found tlp504a on mouser and digikey. But they are of different colors.
TLP504A
What do 0817 refer to. I found tlp504a on mouser and digikey. But they are of different colors.
Merry Christmas!
The first digit is a manufacturer code.
The second, the most important, the reference of the component used, the specifications will be identical depending on the manufacturer.
Take them from a reliable source, Mouser, Digikey.....
Color doesn't matter...
But mishandled white will display another color....😵😵🤔