Recently, I repaired a USB DAC and encountered a damaged part,
But I don't know what it is.
Is it an optocoupler? What role does it play here
Ask for help from friends who have seen this part. Thank you
But I don't know what it is.
Is it an optocoupler? What role does it play here
Ask for help from friends who have seen this part. Thank you
It's difficult to tell from your photo, but it's almost certainly an opto part of some sort because of the molded lens. Am I correct in thinking that there are two opto devices "looking" at each other? Is this a light shutter pair that senses a vane that blocks the light path? Does the enclosure provide any clues? Can you trace out the connecting circuitry? i.e. Is one a LED source, the other a photo-transistor/photodiode?
Yes, they belong to some kind of photosensitive device
But I don't know the specific model and function
The opto device(s) appears to be in line with the connector socket on the left side. Check the copper traces both sides of the PCB. Together with the connecting lead pin assignments, that may indicate enough to know what the opto-coupler does though maybe not why this particular custom assembly type was used.
It looks like the internals of a Toslink receiver. Also has 3 pins. Digital receiver is nearby. What else could it be near an SPDIF receiver? Seems logical except that the dimensions seem off (looks too wide and pins too short). A picture of the board zoomed out and from a different angle would help. As usual the one that wants help does not give adequate information.
Hint: if one of those 3 PCB traces goes to the SPDIF RX pin of the infamous SA9027 then it is an optical input for sure.
Hint: if one of those 3 PCB traces goes to the SPDIF RX pin of the infamous SA9027 then it is an optical input for sure.
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It could also be a bi-color LED, does the position in/on the case give any clues?
Am I correct that in the picture you show the original AND a replacement, or is it actually a single device?
Jan
Am I correct that in the picture you show the original AND a replacement, or is it actually a single device?
Jan
Had the same thought at first but I have never seen a bicolor LED in such package. Still the optical receiver/transmitter is an option even though it may not be seen at the outside of the device. I showed such a device last week where is also was hidden for some reason. As long as OP does not share a few pictures .... it is all guessing.
A somewhat non standard looking remote control receiver maybe?! Let's conclude without pictures it is "something optical that plays a certain role" 🙂
A somewhat non standard looking remote control receiver maybe?! Let's conclude without pictures it is "something optical that plays a certain role" 🙂
My Logitech mouse has two, through the slotted wheel, it works as scroll sensor. One is TX and the other is RX.
LED and photo sensor.
Also similar device by Omron, RPM sensor through toothed wheel, both devices in same molded housing with a gap for the wheel..
But four terminals, so can use two supplies, it was three wires to tachometer in my machine. Common negative wire.
Same function, LED and photo sensor, infra red in this case.
Meter counts against time reference, shows RPM.
This could be a switch position sensor...
LED and photo sensor.
Also similar device by Omron, RPM sensor through toothed wheel, both devices in same molded housing with a gap for the wheel..
But four terminals, so can use two supplies, it was three wires to tachometer in my machine. Common negative wire.
Same function, LED and photo sensor, infra red in this case.
Meter counts against time reference, shows RPM.
This could be a switch position sensor...
Those in mice have other dimensions isn’t it?
Could it be for volume control!? Optical encoder internals? The symbol left of it seems volume control.
Exciting game. What can we win?
Could it be for volume control!? Optical encoder internals? The symbol left of it seems volume control.
Exciting game. What can we win?
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Those in mice do look similar, I have seen combined and separate units in different models of Logitech, they make many.
Other mice use a pot, which wears out, and most irritating is when the wheel to pot bit gets worn out. Mouse works, no scrolling.
This happened in a Compaq mouse, not generic stuff.
Now I have to make a hex shaft...will get it laser cut in acrylic, friend has a cutter, then spend time fixing it.
Will cost more than the mouse really, if I calculate my wages and time.
Cheap mouse, $2, Logitech last was $5 and up.
OP has gone silent...
Other mice use a pot, which wears out, and most irritating is when the wheel to pot bit gets worn out. Mouse works, no scrolling.
This happened in a Compaq mouse, not generic stuff.
Now I have to make a hex shaft...will get it laser cut in acrylic, friend has a cutter, then spend time fixing it.
Will cost more than the mouse really, if I calculate my wages and time.
Cheap mouse, $2, Logitech last was $5 and up.
OP has gone silent...
Here the Bajaj Pulsar bikes used proximity switches in place of mechanical switches for those on the handlebars, for the lights / indicators / horn.
Less chance of dirt damage, price I have no idea.
Useful source of cheap stuff if needed, must be less than industrial.
Such switches can also be used in audio equipment I think, but prone to magnetic disturbance.
As a Hall Effect sensor, yes. And now you get tiny ones too, but for a one off this can be found in scrap.
Less chance of dirt damage, price I have no idea.
Useful source of cheap stuff if needed, must be less than industrial.
Such switches can also be used in audio equipment I think, but prone to magnetic disturbance.
As a Hall Effect sensor, yes. And now you get tiny ones too, but for a one off this can be found in scrap.
Thank you for your reply
This equipment is currently being sent to others for repair.
I don't know where this part is located in the circuit.
It's really rare, and I don't know where to buy this accessory
Did the USB DAC have a rotary thingie for volume? I googled for "USB DAC" but there are just so many of them! They should give them a name or number.