Well I guess we're going to have to go with printing some fewer PCB's and just call it good. Once people's thoughts on the amp start rolling in, then another GB may have to take place.
I can get in for 2 boards each on June 26th, payday, if that works. Wish I could do it sooner.
Jeremy,
In your first post, I find it interesting how you illuminate your work.
From what I can tell it looks like your using a small LED lamp above the pcb, plus some sort of led/lamp shining up from underneath the pcb.
My older eyes could sure use some info on how you illuminate your work.
In your first post, I find it interesting how you illuminate your work.
From what I can tell it looks like your using a small LED lamp above the pcb, plus some sort of led/lamp shining up from underneath the pcb.
My older eyes could sure use some info on how you illuminate your work.
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I think those are the LEDs for the solar cells to power the error correction part of the amp.
This is interesting. How does a photovoltaic power supply isolate the power fluctuations from the front end? How is it better than say typical RC (circa 10k and 100uF) added on the rails between the VAS and input stage? The LED brightness will fluctuate with fluctuations and photovoltaic module will respond accordingly. Is the LED drive then filtered with an RC?
Optical isolation of power supply is handy when trying to galvanically isolate HV from more delicate circuits. I have used 15kV optically isolated opamps. But the PSU for the HV side needed up needing a triple 5kV DC-DC to get 15kV isolation.
Optical isolation of power supply is handy when trying to galvanically isolate HV from more delicate circuits. I have used 15kV optically isolated opamps. But the PSU for the HV side needed up needing a triple 5kV DC-DC to get 15kV isolation.
Ok, thanks. This is a good idea for isolating sources of ground loop hum I suppose. Do they make shielded ones so that it doesn't get so briight? Actually, if you added a light shield or proximity focused them (touching faces), the conversion efficiency will be even better.
There may be some glowing boxes in the near future. The lower powered G4 is plenty compared to a higher power one that will fit. There’s no need to try to increase voltage.
I don't like my amps to glow too bright. It makes debugging very hard as your eyes get overwhelmed by the brightness. I find a single blue LED to often be too much and I have to cover it with a black piece of shrink tube condom. I agree it is cool to see in operation, but not in development.
Do you have schematics for this or not shown until one buys the board?
Do you have schematics for this or not shown until one buys the board?
I was wondering the same. Would be great to have a BOM or build instructions to read up on before hand. For me being green 😀 it would save a lot of time
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BOM and instructions will be out shortly to people whom paid GB.
We used batteries to develop most of it. I suspect some will have their ways of reducing or changing the color of light.
We used batteries to develop most of it. I suspect some will have their ways of reducing or changing the color of light.
Could you bump my order to a 4,3? A friend heard your 7297 and loves it. He now wants me to build him your new amp.
Nice distortion numbers BTW.
Thank you,
Paul
Nice distortion numbers BTW.
Thank you,
Paul
I thought that's where you already where, so yes I guess that works then. Other than that assuming two other contributors get around to PPing me, a new GB will have to start.