http://electronics-diy.com

https://www.mammothelectronics.com

http://puffhandy.blogspot.com

https://www.dripelectronics.com

https://reverb.com/item/733330-fromel-electronics-boss-cs-3-compression-sustainer-modification-kit?currency=USD&gclid=CK3U9r3EwMgCFQuoaQodG5cGLQ&pla=1

http://www.freestompboxes.org

Tonefiend DIY Club: Projects & Resources

http://www.monteallums.com

https://www.sparkfun.com/categories/273

10 Cool Electronic Music Instruments Under $100

https://www.zzounds.com/edu–electronicinstrumentbuilding

http://www.tonepad.com/project.asp?id=29

https://www.allelectronics.com/category/305/kits-electronic/1.html

https://forum.allaboutcircuits.com/forums/general-electronics-chat.5/

https://reverb.com/item/733438-fromel-electronics-boss-ge-7-eq-modification-kit?currency=USD&gclid=CM2MqoXajcgCFQgaaQodB_MGrA&pla=1

http://www.analogman.com/tshist.htm

https://buildyourownclone.com

What it means that the MeeBlip synth is open source hardware

https://www.diyaudio.com

https://elektromoskva.vhx.tv/products/elektro-moskva-feature-film

Passive Ring Modulator Assembly Instructions

Switchbox and drumsticks

Project 001 – Fixing an old (Boss) power supply

https://en.wikipedia.org/wiki/Capacitor_plague

https://en.wikipedia.org/wiki/EL84

https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2161617_-1

http://www.apogeekits.com/beginner-electronic-kits/bagpipes.htm

https://www.diyaudio.com/forums/instruments-and-amps/176861-modding-fender-frontman-15g.html

Reverse Engineering the Stylophone

https://www.amazon.com/Handmade-Electronic-Music-Hardware-Hacking/dp/0415998735/ref=pd_sim_14_2?ie=UTF8&refRID=1D1DXWPECD4BSWYBR1FA

http://www.singlecoil.com/frmset.html

http://www.electronicstheory.com/COURSES/ELECTRONICS/e101-1.htm

https://www.coursera.org/learn/electronics

https://www.edx.org/course/circuits-and-electronics-1-basic-circuit-analysis

https://tubedepot.com/products/tweed-5e3-vacuum-tube-amp-kit