Altoid Fake Tazer

Step 3 Step 2: The Circuit

Connect the + lead of the battery clip to the middle transformer lead. Connect the middle transformer lead to one side of the 100K resistor. Connect the same side of the 100K resistor to the phototransistor (opposite the flat side).  Connect the other side of the phototransistor to the base of transistor 1. Connect the emitter of transistor 1 to the emitter of transistor 2. Connect the emitter of transistor 2 to the - lead of the battery clip. Connect the collector of transistor 1 to the - of the capacitor and the base of transistor 2.  Connect the base of transistor 2 to the other side of the 100K resistor.  Connect the collector of transistor 2 to the left transformer prong. Connect the left transformer prong to the - lead of the piezo transducer. Connect the + lead of the piezo transducer to the right prong of the transformer. Connect the right prong of the transformer to the + lead of the capacitor.