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For assembly. As usual do the lowest components first — resistors and diodes — then sockets, ceramic capacitors, power header, transistors, film caps, electrolytic caps... Something like that. Consider: 1 simple on/off switch/button/knob/etc. - 2 momentary pushbutton switches 1 rotary switch with two LEDs K switch single-pole double-throw ON-OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D 9x DIP.

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