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Old 24th June 2013, 05:40 PM   #11
Struth is offline Struth  Canada
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

Good to see you are using TO-220s. They have the current capability to support even the hungriest digital effects pedal.

Note that the TO-92 regulators are only rated for 100mA. This happens to be the draw for "vintage" digital delay pedals from Boss - some other brands needed 200mA. Newer pedals may or may not require as much current as low-power techniques have improved quite a bit in the recent decade.

Note also that the tab on the TO-220 is tied to the reference pin (ground for 78xx, ref for 317). The heatsink will be "live" at whichever of these voltages apply. The 78xx and 79xx come as F-paks, fully epoxy encapsulated packages, with a reduction of power rating but an insulated tab. This insulation allows all the tabs to be bolted to the same heat sink or to the chassis without introducing ground loops or upsetting voltage setting.

Your board is nice an neat. The holes for the regulator and diode leads look a bit small. The output caps also look to be sized for the app note value instead of the recommended values above.

Have fun
Kevin O'Connor
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