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| Guitar Effects Boxes | Go-WWW |
| The Guitar Effects Oriented Web Page | Go-WWW | |
| The GEO-Fex collection of vintage and new-design effects and musical related DIY | Go-WWW | |
| Analog Music Zone Guitar Effects Schematics | Go-WWW | |
| Guitar Effects Schematics | Go-WWW | |
| Music Electronics µArchive | Go-WWW | |
| Music Machines do-it-yourself/schematics | Go-WWW | |
| Guitar-related Circuits | Go-WWW | |
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