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Chip Amps Amplifiers based on integrated circuits

Another BPA200 post: Need some advice on finalizing design
Another BPA200 post: Need some advice on finalizing design
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Old 9th February 2018, 03:12 PM   #31
sr2002 is offline sr2002  United States
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I took you alls suggestion. I’m designing the layout for the PCB in Kicad. Just one question when I send the files to Osh or any other pcb manufacturer, which gerber files do they expect? I’m doing bottom Cu, top Cu, top silkscreen, bottom solder mask and the drill file seems to be auto generated based on the footprints. Any other layers? And do I just zip all these and send them?
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Old 9th February 2018, 03:55 PM   #32
00940 is offline 00940  Belgium
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The beauty of OSH Park order system is that you can directly upload your kicad files and they do the gerber conversion. You can even check instantly if the conversion is correct.

For manufacturers asking gerbers, they usually specify what they want and how they want it labelled. You then zip it all and upload.
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Old 9th February 2018, 09:02 PM   #33
sr2002 is offline sr2002  United States
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Here is phase one of the project. I am attaching the PCB and schematic. Please let me know if anything needs to change or looks off on the PCB. For the GND plane I have used 0.2mm clearance, I hope that is enough for OSH park. For the Bridge I am using a 4-pin connector instead because I plan to mount the bridge on the chassis connected to the heatsink. The linear regulator ICs are infact MC78Lxx and MC79xx so the footprints have been adjusted for their respective pinouts, but please let me know if I messed up somewhere. I plan to add more 0.1uf caps on the LM3886 +/-V rails.
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Last edited by sr2002; 9th February 2018 at 09:04 PM.
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Old 10th February 2018, 03:37 AM   #34
sr2002 is offline sr2002  United States
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Bump
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Old 10th February 2018, 03:57 AM   #35
HIPCHECK is offline HIPCHECK  United States
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If you make any PCB's with the SMD 0.2R resistors let me know. I can donate as many as you need. I donated a few hundred last time someone built these amps IIRC.
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Old 10th February 2018, 09:39 AM   #36
Mark Whitney is offline Mark Whitney  Netherlands
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Trying to understand what is in the datasheet about the PSU.

I think they intend you to use one transformer plus bridge and two 1200uF capacitors per channel.
Two 10000uF, 470uF, 0.1uF capacitors per lm3886 and three 0.1uF capacitors per op-amp.
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Old 10th February 2018, 06:14 PM   #37
tomchr is offline tomchr  Canada
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Watch your input voltage! The LM7815/7915 are rated for ±35 V, max.

You may find the LM317/337 to be more useful as they are rated for an input-to-output differential of 40 V.

Tom
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Old 10th February 2018, 07:27 PM   #38
sr2002 is offline sr2002  United States
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Thanks Tom, I overlooked that little detail. I will make that change and switch the LM317 and 337.

@HIPCHECK, thanks a lot I appreciate it! I'm currently sticking with through hole components. But I'll let you know if I end up needing SMDs

@Marrk The PSU datasheet is a little weirdly drawn, but basically it should use a single bridge with a CT transformer. I'm not sure if they intend for people to use those many caps per chip, I supposed it would be nice to do so .. but that would mean about $200 just in capacitors alone lol. Certainly not going to do that.
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Old 10th February 2018, 07:32 PM   #39
sr2002 is offline sr2002  United States
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Any thoughts on the Schematic and PCB? Also, the ground plain clearances, is 0.2mm good enough?
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Old 10th February 2018, 07:33 PM   #40
Mark Whitney is offline Mark Whitney  Netherlands
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40000uF per rail is what is stated in the datasheet and many would see that as a minimum for the amount current demand for this circuit.
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