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4hv.org :: Forums :: High Voltage
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Requesting a double check

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Firnagzen
Sat Dec 04 2010, 02:33AM Print
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
I'm planning on building scopeboy's 555 flyback driver, and I made up a circuit layout with eaglecad. The thing is, I'd like someone to double check two things for me:
-Did I make any careless mistakes? I have a tendency to. Sigh.
-Is the layout appropriate? I'm not really happy with how the power traces go under a fair number of components, but I'm trying to make it as compact as possible.

Thanks in advance!
1291430021 567 FT0 Scopeboy
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ubuntupokemoninc
Sat Dec 04 2010, 02:46AM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
what's a scope boy's driver?
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Firnagzen
Sat Dec 04 2010, 03:00AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
This Link2 is. I'm building the 555 version near the bottom of the page.
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Mads Barnkob
Sat Dec 04 2010, 08:11AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Your power traces are way too thin.
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Firnagzen
Sat Dec 04 2010, 08:16AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Oh, that I know: I'm not actually going to print this as a PCB, I'm just using it to get the layout right. DOn't have the chemicals and equipment for etching.
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Conundrum
Sat Dec 04 2010, 03:23PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
bicarbonate etch (aka salt water etch) to get it mostly done then a dilute solution of persulphate..
should work and is relatively cheap.

-A
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ubuntupokemoninc
Sat Dec 04 2010, 03:40PM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Link2

this is the easiest way to make pc boards i've made a couple using this method you don't need weird chemicals, the weirdest chemical is liquid tin, but you don't need to use that i just tined it with a soldering gun. its super easy amazed

all you need is 99% isapropal alchohol

ferric chloride (witch is a pool chemical and can be found anywhere hot tubes and other pools and pool supplies are sold)

liquid tin (optional) the replacement for this is to tin the copper on the board with a soldering gun and abuch of solder.

a clothing iron (for taking wrinkles out of clothes)

and acetone
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Steve Conner
Sat Dec 04 2010, 03:42PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Wow, rave from the grave. (That's my circuit.)

You're probably going to need some sort of decoupling capacitor between the control voltage input and ground.

Also, put R4 close to the MOSFET's gate pin, and put the track from the 555 to R4 closer to the ground track.
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Firnagzen
Sun Dec 05 2010, 01:11AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Alright, can do. Thanks for the tips.

Also, what difference does it make if the 555-R4 track is closer to the ground trace?
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Arcstarter
Sun Dec 05 2010, 01:43AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Firnagzen wrote ...

Alright, can do. Thanks for the tips.

Also, what difference does it make if the 555-R4 track is closer to the ground trace?
Smaller loop area, less inductance, more beautiful waveforms smile
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