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Back- But could also do all-different colors, but unfortunately Mouser only has A1Ms in orange. *** Expensive, about $3 each. Replacing LEDs in these is supposed to be roughly 2 mm or 16 mm vertical board mount OR: | | | D1, D2 | 2 | 1M | Resistor | | | | | | | R25, R27, R29 | 3 | 1k | Resistor | | | | R14 | 1 | 1uF | Unpolarized capacitor | | R16, R18, R26 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)"/>
- Thru-hole 20 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity.
- 1x40, 2.00mm pitch, double rows Through hole.