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Old 26th January 2007, 11:48 AM   #1
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Wink Single sided 4780 PCB ready

Yahoo!!, at last my first 4780 PCB is ready. Just have a look at this beautiful picture. Planning to made on Order within India boundaries.
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Old 26th January 2007, 11:51 AM   #2
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Lightbulb PCB LAyout

Here is the actual size PCB Layout (component side - Print exactly for Laser Print transfer PCB making). Circuit is LM4780 reference layout as in the datasheet.
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Old 26th January 2007, 12:00 PM   #3
impsick is offline impsick  United States
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nice.
i need to get a laser printer.
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Old 26th January 2007, 12:09 PM   #4
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Arrow The drill i used for drilling holes

I used a simple cassette drive motor and fitted a hand filed shaft in form of drill. little hit and trial is required to get fine drilling thickness.
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Old 28th January 2007, 09:50 AM   #5
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Lightbulb More compact layout.

This is first revision of the PCb and successfully able to further compact the PCB, only 42 * 55 mm for one LM4780
cyan lines repesents capacitors and magenta lines represents resistor
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Old 28th January 2007, 09:53 AM   #6
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Arrow component layout

cyan lines - capacitors
magenta lines - resistor
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Old 28th January 2007, 04:48 PM   #7
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notes:
1.) jumpers?
2.) many small PCB designs place the large caps directly in front of the mounting holes. you may need to solder the caps AFTER the pcb is mounted.
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Old 29th January 2007, 06:01 PM   #8
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Quote:
Originally posted by theChris
notes:
1.) jumpers?
2.) many small PCB designs place the large caps directly in front of the mounting holes. you may need to solder the caps AFTER the pcb is mounted.


Jumper setup for the 4780 PCB. Circuit is as per LM4780 reference PCB schematic and also suits for special audio application amplifier (arrangement for Cf and Rf2 has to made on solder side of PCb if required).
There are no mounting holes on the PCB, mainly for compactness, the IC after mounting on heatsink will supports the pcb. But if required a mounting hole can be made on the left to muting resistor.
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Old 1st April 2007, 08:56 AM   #9
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Default MAjor layour change - reduced jumpers

after a major design change, i have able to reduced the jumpers to 3 nos only. No jumpers in signal line in new layout, further the whole circuit is very symmetrical with star ground. This time i made in 2 sizes, standard version PCB to accomodate 4700 muF caps and a compact PCb for 1000 muF caps.

More pics available at http://www.geocities.com/cool_mechi/lm4780.htm
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