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PCB cutout, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler IR Receiver Vishay TSOP-xxxx MOLD Oscillator, DIP8, Large Pads, http://cdn-reichelt.de/documents/datenblatt/B400/OSZI.pdf Miniature Crystal Clock Oscillator TG2520 series, https://support.epson.biz/td/api/doc_check.php?dl=app_TG2520SMN⟨=en Miniature Crystal Clock Oscillator EuroQuartz XO32 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO32.pdf, 3.2x2.5mm^2 package SMD Crystal Seiko Epson SG-8002CA https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, 7.0x5.0mm^2 package SMD Crystal EuroQuartz EQ161 series http://cdn-reichelt.de/documents/datenblatt/B400/PG32768C.pdf, hand-soldering, 3.2x1.5mm^2 package SMD Crystal Oscillator Seiko Epson SG-210 https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-210SED, 2.5x2.0mm^2.

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