DIY QUAD E-BOW

I have made a DIY -E BOW, Planed it for 3,4 years and I could built this. Maybe you can find useful links for making e-bow easily, the main circuit it very simple, but some points you have to care about, 1 the position of piezo speakers 2 model number of piezo speakers these are so important to work well, I used below type of piezo QMB111PC input piezo would need 140-Ω ;higher output : 16Ω useful link of making ebow thank you E-bowを自作しました。 今回はかねてから複数のE－BOWを作ってみたかったので 3.4年越しの計画の上ようやくできました。 また詳細は違うURLで上げます。