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Extent permitted by, but not necessary for old fogeys like me to get below 200bpm -- Clock POT is too small for a 5mm led, with a 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler IR Receiver Vishay TSOP-xxxx, MOLD package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Siemens SFH900 reflex photo interrupter/coupler/object detector, see https://www.batronix.com/pdf/sfh900.pdf Siemens SFH900 reflex photo interrupter coupler object detector Fiberoptic Reciver, RX, Toshiba, Toslink, TORX170, TORX173, TORX193, TORX194 Fiberoptic Reciver RX Toshiba Toslink TORX170 TORX173 TORX193 TORX194 IR Receiver Vishay TSOP-xxxx MINIMOLD IR Receiver Vishay TSOP-xxxx MOLD Oscillator, DIP8, Large Pads, http://cdn-reichelt.de/documents/datenblatt/B400/OSZI.pdf Miniature Crystal Clock Oscillator TXC 7C series, http://www.txccorp.com/download/products/osc/7C_o.pdf, hand-soldering, 5.0x3.2mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002JC https://support.epson.biz/td/api/doc_check.php?mode=dl⟨=en&Parts=SG-8002DC, hand-soldering, 7.0x5.0mm^2 package Miniature Crystal Clock Oscillator EuroQuartz XO32 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO32.pdf, 3.2x2.5mm^2 package SMD Crystal SERIES SMD7050/4 https://www.foxonline.com/pdfs/FQ7050.pdf, hand-soldering, 7.0x5.0mm^2 package SMD Resomator/Filter.

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