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BackGenerator and a momentary-on button to advance the step LED + 23mm hole_left = slider_center - 13; // this is actually a pushbutton momentary, but roughly same dimensions as toggle switch ON-ON | | | J1 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch ON-ON Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14