aggressive slinky improvisation, part II

last week, i discovered that the quality of the lm386 amp could be vastly improved by increasing the operating voltage. in so doing, i increased the headroom considerably. i am currently supplying 20v to the amp.
i implemented the amp in a simple feedback instrument, pictured below.
spring_fb1
by coupling the slinky to the contact mic, and draping it over the speaker cone, feedback is produced. there is also a small stone phaser - which i've fixed for someone- involved.

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