PhotogateTrigger Assembly

Step 1. Adding the 555 timer and wires

Step 2. Add the 10-kW variable resistor

Step 3. Add the fixed resistors

Step 4. Add the 0.01-uf capacitor

Step 5. Add the SCR

Step 6. Connecting the interrupter photogate

Step 7. Add the battery clip and flash wires

Step 8. Connect the photogate to the delay unit

Step 9. The completed breadboard