This is about as small as I can build a foot switchable boost I think, very cheap component count wise, whole thing less than a tenner in parts and sounds identical to an MXR micro amp which isn't surprising cos it's basically the same circuit (why reinvent a perfectly good wheel
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May I present the Dr Watson BabyBoost
Definitely external DC power only, you couldn't fit a watch battery in there let alone a PP3
I've also built a headphone amp in this type enclosure and a Klon buffer ..... very handy for when space is tight on the board
www.2020studios.co.uk
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https://images.reverb.com/image/upload/s--wMiJ0A3V--/a_exif,c_limit,e_unsharp_mask:80,f_auto,fl_progressive,g_south,h_1600,q_80,w_1600/v1481145055/bprkfzbup1csawtwveua.png
Oh, and the giant hotone knob lights up iirc, just in case you thought it didn’t already look silly enough.
https://photoboothjournal.files.wordpress.com/2018/01/photoboothnewyearparty19573.jpg
The pots control knob sits flush on the surface so standing on it won't damage the pot
Here's PedalHead .... a stereo headphone amp designed to drive common low impedance IEM's like Shure 215's ... for use by guitarist using dual IEM & guitar cables
Supportact said: [my style is] probably more an accumulation of limitations and bad habits than a 'style'.
Not sure the BabyBoost quite matches my search for an unmissable overdrive but it’s very cool.