B
BlackMamba
Guest
Source here
Project by tranzystor1204:
I am 17 years old and I designed some kind of encrypted lock. Maybe it will be useful for someone.
Schematic is drawn in CROCOCLIP.
Button “a” on the schematics means all buttons not being a part of a code. They should be connected in parallel to allow capacitors discharge after pressing any of them. Buttons “1”, “2”, “3” and “4” are used for entering the code. They should be connected in a sequence to the relevant digit.
NPN transistor used were BC548; PNP transistors used were BC558.