for people who are getting ready to order parts - came across another supplier while looking up parts for another project - arrow electronics. they do free shipping with no threshold worldwide, and seem to be cheaper on some parts.
www.arrow.com
www.arrow.com
Sorry about your health issues. Hope you are feeling better. I have more boards, just send me a PM with your PayPal address, number of board you need and country to ship to. Cost is $28ea and shipping is $5 in US, $12 Can, $15 everywhere else.
Hi Oxothuk (Alexey?),
Thanks for chiming in - can you make these with a small pot built in? You make top notch stuff with genuine quality parts, I totally agree.
Regards,
X
i don't like the idea to use variable resistors within ref voltage circuit for low noise application
I was trying to get hold of some boards back in July. Do you have any extra available at all?
Cheers
I was interstate for a couple of weeks, so I think it only took about a fortnight in the end.
Another option for a power supply for this amp if one wanted to use a linear supply would be the new Mark Johnson/Gtose cap multiplier. Beautiful layout by Prasi. This cap mx board has advantage that there is a pot to adjust dropout voltage from 1.3v and up to about 2-3v. So one could set perfectly balanced upper and lower rails at +/-18v.
https://www.diyaudio.com/forums/pow...sy-capacitance-multiplier-55.html#post5566935
https://www.diyaudio.com/forums/pow...sy-capacitance-multiplier-55.html#post5566935
from a quick look at the thread it looks like it needs both + & - inputs....or does this board also split single rail to dual rail?
it does look pretty impressive and imposing though 😀
it does look pretty impressive and imposing though 😀
finally ordered the parts for the amp ! got the meanwell power converter instead, for anyone thinking about getting it - its much larger and no way of fitting on the pcb
X:
with heatsinking of the mosfets, would the same ones you used for the power regs be fine? or does it need something beefier ? (I seem to remember you hooking it up to a pretty big heatsink with CPU fans...or was that another thread?)
heatsink on power regs as in this post - https://www.diyaudio.com/forums/gro...led-class-hpa-sub-ppm-thd-24.html#post5534747
X:
with heatsinking of the mosfets, would the same ones you used for the power regs be fine? or does it need something beefier ? (I seem to remember you hooking it up to a pretty big heatsink with CPU fans...or was that another thread?)
heatsink on power regs as in this post - https://www.diyaudio.com/forums/gro...led-class-hpa-sub-ppm-thd-24.html#post5534747
That was another thread. This amp works fine if you simply use the baseplate of the amp as a heatsink. 18v x 125mA is about 2w per MOSFET so 8w total.
Input resistors
Hi
What is the purpose of having a 2K2 resistor and a 100R resistor at the input?
Can I short one out eg the 100 R or am I missing something?
I’m asking because I’m trying to cut down the number of components on the input side.
PS do you need a regulator with the cap multiplier above?
Hi
What is the purpose of having a 2K2 resistor and a 100R resistor at the input?
Can I short one out eg the 100 R or am I missing something?
I’m asking because I’m trying to cut down the number of components on the input side.
PS do you need a regulator with the cap multiplier above?
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