Handbook of hardware schemes, cables layouts and connectors pinouts.
WSPR MET DE RASPBERRY PI
https://pd3rfr.nl/experimenten/raspberry-pi/wspr-op-de-raspberry-pi
HDD and other storage devices connectors pinouts
https://pinouts.ru/HD/
Condensator codes
https://www.budgetronics.com/index.php?action=extra&extra=A_condensator_codes&lang=NL
Schakelingen, download, info en meer
https://www.circuitsonline.net/