I'll try to take some other pictures, when the sun will be shining in the room.
Yesterday, I had to use the flash, and I realised that some details you don't see with your eyes appear on the picture (especially scratches).
It looks better in real life than on my pictures 😎
Yesterday, I had to use the flash, and I realised that some details you don't see with your eyes appear on the picture (especially scratches).
It looks better in real life than on my pictures 😎
Bricolo said:
Any Idea how to realize a nice silkscreen on the frontplate?
I'm running tru the whole city to find any transferrable letters (delcalcomanie), like Letraset. Nowbody seems to sell them anymore, since the computer does a good job.
....and I still couldn't figure how to put a 12mm alu plate through the printer 😕
- dan
No idea, sorry.
I have no plans to add some text on the frontplate.
But I'll probably add a glass plate on the front. IMO it could look nice
I have no plans to add some text on the frontplate.
But I'll probably add a glass plate on the front. IMO it could look nice
Distortion: 0.005%
Is this possible?
It varies from 0.0020% fo 0.02% depending of the frequency and output power (always way before clipping)
Is this possible?
It varies from 0.0020% fo 0.02% depending of the frequency and output power (always way before clipping)
Bricolo said:
Those measurements values look perfectly normal to me (and logic if they do vary with the output power/ frequency).
Distortions do not tell much about sound. Interesting would be the behaviour of the amp with a 40kHz Square on an oscilloscope.
- dan
I would like to build paralel/bridge version of TDA7293 (like within Marshall Mode four) to get 350-400W music power. I asking, somebody did same, or somebody can tell me, which better, 7293, or 7294S? Can I use TDA7293 with +-50V power supply? If you have some advice for this big project 🙂 please 😎
Bricolo said:
Looks rather good to me! The flanks ("les flancs") are perfectly 90°, impressive! The fact that the squares are not straight, but falling, looks to me that there is a coupling cap somewhere. But that's OK, as long as it is a good one.
This amp probably sounds smooth, with no real audible distortion.
Good job.
- dan
Alfetta87 said:
I'm not sure I was AC coupled on the 1st channel, but I realised a strange thing with my scope:
when the CH2 (the input signal here) is AC coupled, the square wave's top and bottom aren't horizontal, but falling. And much more than the small curve in my picture.
Maybe my scope's AC coupling cap isn't designed for 40Hz
Bricolo said:
I'm not sure I was AC coupled on the 1st channel, but I realised a strange thing with my scope:
when the CH2 (the input signal here) is AC coupled, the square wave's top and bottom aren't horizontal, but falling. And much more than the small curve in my picture.
Maybe my scope's AC coupling cap isn't designed for 40Hz
One of us misunderstood... I meant 40.000Hz (40kHz), and you wrote 40Hz! .😕
40kHz is by far more critical for an amp that 40Hz
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