A list of the X-Gun component Specifications

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• C1, C2, C3: 410 uF 300 Volt electrolytic flash capacitors store required coil energy; purchased from surplus catalog for like $2/each
• D1: High voltage rectifier, epoxied in flyback transformer rectifies the output of the flyback transformer so capacitors can be charged
• D2, D3, D4: 16 A 1000 Volt rectifier housed in SCR power cube; protects the SCR from overvoltage by the coil. Also disapates coil energy and improves projectile velocity.
• Q1: 2N3773 Bipolar power transistor mounted on heat sink; drives transformer circuit puchased from ON semiconductors for like $2
• Q2, Q3: Photo transistor packaged with transmitting diode; purchased from digikey.com for like $2/each
• Q4, Q5: BU407 Medium sized bipolar transistor for signal amplification; purchased from ON semiconductors for $.72
• SCR1, SCR2, SCR3: 16 A 1000 Volt SCR in silicon power cube for swiching capacitors, purchased from Surplus Sales of Nebraska for like $5/each
• SCR4, SCR5: Medium sized SCR for signal memory application; purchased from digikey.com for like $.50/each
• T1: Flyback Transformer From Television
• VOM: Cheap analog voltage meter for monitoring capacitor voltage; salvage from hardware store trash
• 2K Variable resistors: Allows the tweeking of the gate signal to the SCR's; couple bucks at fry's electronics
• Red and Green Led's: red tells me that the scr gate is getting current and green means the gate is off and ready to fire.