20 photo transistors
Posted: Sat Dec 27, 2014 5:46 pm
Theses old photo transistors are for sale on ebay i did buy one lot to experiment with ,very cheap well worth buying.
http://www.ebay.com.au/itm/SP201-PhotoT ... 3a7e9f848c
http://www.ebay.com.au/itm/SP201-PhotoT ... 3a7e9f848c