Reposting here as this seems to be a more appropriate forum
Hey all
I am building an amp using UCD180 OEM modules and feeding the unbuffered input, everything fine with the PSU and it works for a few seconds and mutes shortly after I turn it on. While I was troubleshooting it, I noticed that it plays for a few seconds every time after I connect pin 34 to low and then it just mutes until I disconnect pin 34 and reconnect it to low.
Any hint?
Hey all
I am building an amp using UCD180 OEM modules and feeding the unbuffered input, everything fine with the PSU and it works for a few seconds and mutes shortly after I turn it on. While I was troubleshooting it, I noticed that it plays for a few seconds every time after I connect pin 34 to low and then it just mutes until I disconnect pin 34 and reconnect it to low.
Any hint?
Is pin 34 connected to pin 5,6,7 or 8 ? Connection to any of this pin
Should allow the put down to take place . I also completed my Oem
With help from members here not too long ago. Btw what front end
Are you using. ?
Should allow the put down to take place . I also completed my Oem
With help from members here not too long ago. Btw what front end
Are you using. ?
nope. one channel starts when pin 34 is triggered to negative power supply and mutes after few seconds and restarts if I disconnect and reconnect pin 34 to negative.
the other channel stays mute regardless of pin 34 status (to ground or negative power supply).
meeehhhh!
the other channel stays mute regardless of pin 34 status (to ground or negative power supply).
meeehhhh!
I first connected pin34 to ground but it stayed mute. I tried negative rail after I checked all the connections to find false contact or wrong wiring and they were all OK as per data sheet.
This puzzles me.
This puzzles me.
Pin 34 is default on stand by mode. To pull down to activate amp it must be connected to ground pin which is either 5,6,7 or 8 pin of the module. It cannot be connected to anything
Else. I presume that you are using single power supply to power both modules. Use a dvm to check voltage of the supply when connected to module on positive n negative rail & see whats the reading
Else. I presume that you are using single power supply to power both modules. Use a dvm to check voltage of the supply when connected to module on positive n negative rail & see whats the reading
it sounds ok. Again I fear that you might have damage the board by connecting pin 34 to neg supply rails in the early stage. perhaps someone can chime in to advice.
Good luck
Good luck
that would sound strange to me ... it was mute when pin 34 was connected to ground, I connected to low supply only to give it a try as it was not working and all other pins were OK (signal, output, powers). I will shoot an email to Hypex too.
faulty modules perhaps but then again cant be 2 at the same time. your ground connection is it connected directly onto pins 5,6,7,8 or connected to ground of power supply board ?
Well I'm at lost. Sorry this may sound silly but have you identified pin 34 correctly ?
Also are you using pin 27 & 31 for input ? If so 31 is signal input 27 is connected to
ground
Also are you using pin 27 & 31 for input ? If so 31 is signal input 27 is connected to
ground
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