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DIY Stompboxes => Building your own stompbox => Topic started by: Joe Hart on August 04, 2011, 12:31:50 PM

Title: Single Transistor Boost PCB Layout
Post by: Joe Hart on August 04, 2011, 12:31:50 PM
Can someone please check my layout? I think it's good, but a different set of eyes may see something I missed (and I've never done my own layout before).

Here's the schematic:
(http://www.joehartband.com/BoostSchematic.jpg)
And here's my layout:
(http://www.joehartband.com/BoostLayout.jpg)

Thanks!
-Joe Hart
Title: Re: Single Transistor Boost PCB Layout
Post by: John Lyons on August 04, 2011, 12:42:55 PM
Looks good to me.
You don't need the 1M pulldown at the end though
as the .1 output cap will discharge through the 50K
volume pot.
Title: Re: Single Transistor Boost PCB Layout
Post by: Steve Mavronis on August 04, 2011, 12:47:56 PM
PCB layout wise, if you rotate that transistor counter-clockwise 90 degrees your traces could cleanly route to it more directly, but might not have to depending on its physical placement.
Title: Re: Single Transistor Boost PCB Layout
Post by: Joe Hart on August 04, 2011, 12:53:11 PM
Quote from: John Lyons on August 04, 2011, 12:42:55 PM
Looks good to me.
You don't need the 1M pulldown at the end though
as the .1 output cap will discharge through the 50K
volume pot.

Yay! I did the layout correctly. I will get rid of the 1M at the end. Thanks!
-Joe Hart
Title: Re: Single Transistor Boost PCB Layout
Post by: Steve Mavronis on August 04, 2011, 12:56:19 PM
A dumb question on my part because I don't know and trying to learn - is it normal for the positive side of a cap to be grounded?
Title: Re: Single Transistor Boost PCB Layout
Post by: Joe Hart on August 04, 2011, 12:56:58 PM
Quote from: Steve Mavronis on August 04, 2011, 12:47:56 PM
PCB layout wise, if you rotate that transistor counter-clockwise 90 degrees your traces could cleanly route to it more directly, but might not have to depending on its physical placement.
Thanks, Steve. The issue is that I want the transistor part number clearly visible. The boost sounds super evil and the number printed on the transistor is "666"! That needs to take precedence!!
-Joe Hart
Title: Re: Single Transistor Boost PCB Layout
Post by: Joe Hart on August 04, 2011, 12:58:07 PM
Quote from: Steve Mavronis on August 04, 2011, 12:56:19 PM
A dumb question on my part because I don't know and trying to learn - is it normal for the positive side of a cap to be grounded?
The pedal is negative supply, so the positive goes to ground.
-Joe Hart