Sơ đồ nguyên lý |
Danh sách linh kiện như sau
IC1=4093 R1=10K 1/4W C2=100nF 100V MKT
Q1=BC550 R2=1M 1/4W J1=2pin Connector
D1=1N4148 R3=4.7K 1/4W S1=sw normal open [see Fig. 2+3 and text]
D2=Led 5mm Red normal or Flash R4=820ohms 1/4W 9V battery with clip
D3=Led 5mm Red normal C1=4.7uF 25V [for ~4sec delay time]