Dear xrk971 - I am interested in a fully assembled amp but I cant see a price listed. Please can you update on this or a link were its available.
Just to summarize the current status:
Name / Units / Country
————————————————
turion64 / 1 amp / USA
Plott / 1 amp / Austria
Martial31 (Etsy) / 2 amps / USA
Vishal Devgon/India/ 1 stereo amp
Dr. Rasta and vinodt1347 are interested, but no further data provided.
And there was John Doe in the list, but he disappeared...
Come on, give yourself a push
Name / Units / Country
————————————————
turion64 / 1 amp / USA
Plott / 1 amp / Austria
Martial31 (Etsy) / 2 amps / USA
Vishal Devgon/India/ 1 stereo amp
Dr. Rasta and vinodt1347 are interested, but no further data provided.
And there was John Doe in the list, but he disappeared...
Come on, give yourself a push
Hi Tommost,
Thanks for the tip. If we redesign the board, I will do some other things too. Will keep this in mind. LT DCDC converters are also prone to supply chain issues. I use LT8364 SEPIC converter on a commercial product and it was held hostage by that one part for almost a year! Nothing is safe unless discrete and using common/generic parts.
@Plott - "John Doe" was ficticious sample name
Let's add 1 unit each for Dr Rasta, Vinod told me in PM he withdrew his entry...
Name / Units / Country
————————————————
turion64 / 1 amp / USA
Plott / 1 amp / Austria
Martial31 (Etsy) / 2 amps / USA
Vishal Devgon/India/ 1 stereo amp
Dr Rasta / 1 amp / ?
I had a question regarding BTL to PBTL configuration, but I think I worked thru the answer while writing it down. Please let me know if there's anything that stands out as wrong in my train of thought:
Ideally, when connecting BTL outputs together to form the PBTL, would it be downstream of only 1x LC low pass filter? Having it downsteam of both doubles the inductance (assuming zero magnetic coupling) and doubles the capacitance, which overall halves the low pass filter from 50kHz to 25kHz (altho still in the 20-60kHz cutoff freq chosen above hearing frequencies). Downstream does does have the benefit of not doubling the inductor current though.
Page 28 of the datasheet shows just a PBTL config, w/ a single pair of 10uH inductors (& 2x 470nF LC caps, I assume just for lower ESR vs 1x 1uF??). I also believe the evaluation board's PBTL diagram is missing the second capacitor stack on page 2 here.
This diagram shows my current understanding, with the red lines showing the current BTL->PBTL bridging; blue lines would ideally be switched to bypass the second LC filter.
I think I answered my question in that it doesn't matter that the low pass cutoff changes; it also has the benefit of being simple to bridge, and makes the inductors cheaper/smaller to not deal w/ more current. I guess my next question is why pick a 50kHz cutoff frequency in the first place, unless it's specifically so you can bridge like this and still be above 20kHz? I assume that's a function of keeping a smaller inductor & having the cap sized such that the low pass is close to critically damped w/ a quality factor near 0.707?
Ideally, when connecting BTL outputs together to form the PBTL, would it be downstream of only 1x LC low pass filter? Having it downsteam of both doubles the inductance (assuming zero magnetic coupling) and doubles the capacitance, which overall halves the low pass filter from 50kHz to 25kHz (altho still in the 20-60kHz cutoff freq chosen above hearing frequencies). Downstream does does have the benefit of not doubling the inductor current though.
Page 28 of the datasheet shows just a PBTL config, w/ a single pair of 10uH inductors (& 2x 470nF LC caps, I assume just for lower ESR vs 1x 1uF??). I also believe the evaluation board's PBTL diagram is missing the second capacitor stack on page 2 here.
This diagram shows my current understanding, with the red lines showing the current BTL->PBTL bridging; blue lines would ideally be switched to bypass the second LC filter.
I think I answered my question in that it doesn't matter that the low pass cutoff changes; it also has the benefit of being simple to bridge, and makes the inductors cheaper/smaller to not deal w/ more current. I guess my next question is why pick a 50kHz cutoff frequency in the first place, unless it's specifically so you can bridge like this and still be above 20kHz? I assume that's a function of keeping a smaller inductor & having the cap sized such that the low pass is close to critically damped w/ a quality factor near 0.707?