Hi Destroyer OS:
I have been enjoying the EC 7293 in dual mono build by pinocchio. In last couple months I notice every few minutes a slight popping sound in one channel that lasts maybe half a second. Something like the pops one would hear with record players due to a small skip.
Do you have any suggestions what might be going on?
It happens also some times when there is no signal coming in (ie dac + preamp is off).
I have been enjoying the EC 7293 in dual mono build by pinocchio. In last couple months I notice every few minutes a slight popping sound in one channel that lasts maybe half a second. Something like the pops one would hear with record players due to a small skip.
Do you have any suggestions what might be going on?
It happens also some times when there is no signal coming in (ie dac + preamp is off).
My first thought is something on the AC line. There’s not exactly much of a reason for anything in an amp to have that kind of cycle length. I’d check for motors, lights HVAC, etc turning on/off first.
It’s possible. Have you swapped speakers? (Probably not useful but its best to narrow our scope).
If you open the lid do you see any indication of fluctuations with the LED when it makes the sound, or an audible sound from within the amp?
If you open the lid do you see any indication of fluctuations with the LED when it makes the sound, or an audible sound from within the amp?
Destroyer OS you are right; it seems to be some kind of noise in the AC supply.
I switched the channels (meaning both the signal inputs and the speaker connections) and the noise was unchanged. Then I remembered that 2-3 months ago I had ---following internet advice---plugged in the amp direct into the wall AC socket instead of my Furman 1800s power filter and surge protector. I plugged the amp back into the Furman and the popping noises mostly stopped. I still hear one occasionally, and I think I hear v. weak pops (almost inaudible; maybe I am imagining) too.
So I will try to track down the source of electrical interference. I was thinking of installing a dedicated line for stereo anyway.
I switched the channels (meaning both the signal inputs and the speaker connections) and the noise was unchanged. Then I remembered that 2-3 months ago I had ---following internet advice---plugged in the amp direct into the wall AC socket instead of my Furman 1800s power filter and surge protector. I plugged the amp back into the Furman and the popping noises mostly stopped. I still hear one occasionally, and I think I hear v. weak pops (almost inaudible; maybe I am imagining) too.
So I will try to track down the source of electrical interference. I was thinking of installing a dedicated line for stereo anyway.
I am glad to hear it's something perhaps more easily fixed.
For my TV I have to use a HumX or the amp gets huge interference from the laundry room light that's 35 feet away or so on another side of the house.... Using the analog out on TV to an amp.
For my TV I have to use a HumX or the amp gets huge interference from the laundry room light that's 35 feet away or so on another side of the house.... Using the analog out on TV to an amp.
The links to the pictures in #1 all appear to be dead. Could you please update? Very interested in this design.
Hi all i was wondering how important a soft start circuit is for the ec 7293 and are the claims that if you dont use a soft start circuit you will slowly damage the transformer and filter caps?
Thank You
Thank You
I have never made such claims or even said I think one is needed. They are neat but it’s your choice.
Ah, I'll refer to the forum. There's plenty of topics.
They're nice to have, but I'm not going to say required for an amp this size.
They're nice to have, but I'm not going to say required for an amp this size.
which enclosure was used for this build
im guessing it is the 3u dissipante from diy audio store. If it is is it the 400 or 500mm model?
thank you
im guessing it is the 3u dissipante from diy audio store. If it is is it the 400 or 500mm model?
thank you
re: Case
It is not the dissipante (which was unavailable during the early days of the pandemic). It was obtained from ebay. There is a link in one of my posts around pinocchio's
It is not the dissipante (which was unavailable during the early days of the pandemic). It was obtained from ebay. There is a link in one of my posts around pinocchio's
Just started stuffing my boards and have a couple of questions
1) is there a pre setting for the trimmer pot ?
2)pvi board calls for three 33uf 50v caps but the bom had 56uf 50v is this correct ?
1) is there a pre setting for the trimmer pot ?
2)pvi board calls for three 33uf 50v caps but the bom had 56uf 50v is this correct ?