Hello, yes that is possible, are you after board with smd resistors or boards with a full kit and smd resistors soldered?
rhysh said:
Hi,
I've paid for 4 PCBs and would like you to do soldering
of all SMD components (RESISTORS and CAPACITORS) only
for me.
Please advise total costs.
Cheers
TS
Can someone point me to some Mouser or Digikey product to use as Connector for Power and J3?
Thanks
Thanks
More boards will ship today hopefully, but the weather is quite bad and the post office is quite a walk away.
More boards are available.
More boards are available.
Rhysh and others,
I have been rereading some of the Jeff Rowland Model 10 writeups -- which Alexw88 cloned this pcb from. They mention that the Model 10 used a switch mode power supply. To do justice to this clone are there any sites showing schematics of the original power supply. I have not been able to find this specific information. It might be more involved than it is worth but something to think about. The original sold for 6800.00 U.S. dollars.
Tad
I have been rereading some of the Jeff Rowland Model 10 writeups -- which Alexw88 cloned this pcb from. They mention that the Model 10 used a switch mode power supply. To do justice to this clone are there any sites showing schematics of the original power supply. I have not been able to find this specific information. It might be more involved than it is worth but something to think about. The original sold for 6800.00 U.S. dollars.
Tad
I will look for the original SMPS supply schematics, if these can be found and cloned, who would be intrested? I would like to build a smps version to save on space and weight.
Rhysh,
I would like to build the smpt just to have one. Count me in for a set. I should learn a few things from that project which might be useful in other endeavors.
What do you figure the advantage/disadvantage of this besides weight and physical size?
I see you have received the second board order. You plan on getting most of them out this week? How are things progressing with the solid state attenuator boards. I received my TI chips last week.
Tad
I would like to build the smpt just to have one. Count me in for a set. I should learn a few things from that project which might be useful in other endeavors.
What do you figure the advantage/disadvantage of this besides weight and physical size?
I see you have received the second board order. You plan on getting most of them out this week? How are things progressing with the solid state attenuator boards. I received my TI chips last week.
Tad
SMPS are noisy. I would imagine JR did serious work to their design to combat this making the PSU in the original amp very specific. IMHO its better to go with a properly designed 'normal' psu.
Data on SMPS noise.
http://www.acoustica.org.uk/t/3pin_reg_notes2.html
A possible soloution:
Teddy Pardo low noise 'Powerreg'.
Mike.
After further thoughts, this is not a good idea.
As mike says, SMPS supplies are usually very noisy, i dont think it is really worth it.
Instead, i have decided to create a regulated power supply for the BPA300. I have played around with regulation on the BPA300 in the past, and i think it sounds a lot better.
I plan to offer,
High current voltage regulation.
Onboard capacitance using lots of smaller caps.
Onboard rectifiers.
For the price it will cost to build, i think great results can be obtained.
As mike says, SMPS supplies are usually very noisy, i dont think it is really worth it.
Instead, i have decided to create a regulated power supply for the BPA300. I have played around with regulation on the BPA300 in the past, and i think it sounds a lot better.
I plan to offer,
High current voltage regulation.
Onboard capacitance using lots of smaller caps.
Onboard rectifiers.
For the price it will cost to build, i think great results can be obtained.
Hi Rhysh,
Would you consider incorporating the 'Powerreg' (link above) into this design? Its a very low noise regulator designed for high current applications such as chip amps. By all accounts these regs work superbly on chip amps and the designer says his LM3875/powerreg amp is the best he has heard.
A PCB including Rectifier, smoothing and Powerreg would be a real killer PSU. I know there would be a lot of interest over @ pinkfishmedia plus Teddy is happy to give technical advice.
Mike.
Mike,
I will take a look at the 'powerreg', but rerember we are looking at up to 8 or 9 amps per rail of current on a monoblock running at full load, if the circuit in question can handle that much and more current then i will implament it.
I will take a look at the 'powerreg', but rerember we are looking at up to 8 or 9 amps per rail of current on a monoblock running at full load, if the circuit in question can handle that much and more current then i will implament it.
After looking into the PowerReg, it looks like it will be a real upgrade to the BPA300. I advise anyone who has not bought the PSU capacitors and rectifiers yet to hold on a few days to see if i can come up with somthing.
For the small price it will cost to include regulation, i think it will be definitely worth it.
For the small price it will cost to include regulation, i think it will be definitely worth it.
I have been playing around by using a LM317 as a voltage refrence for 3055 transistors in LTSPICE, it looks good, and clean.
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