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Registered Member #1633
Joined: Tue Aug 12 2008, 04:21AM
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Posts: 45
hey all, Im trying for a three stage v-switch coilgun, but am having some problems actually designing the circuitry. Simplicity is almost everything, as is (mostly) radioshack availability (ecxept for the SCR's and optocouplers). So does anyone see any problems with this circuit? It is supposed to work by first grounding all the optocouplers by means of 3 phototransistors (Q's 1,2 & 3). When the beam is interrupted, voltage flows through the optocouplers in line with D's 2, 3, & 6, providing a sharp and punctual pulse to their respective Phototransistors when Charging the capacitors 5, 6, & 7. the phototransistors then trigger the Main SCR which activates the coil. When the beam brakes, C's 5, 6, & 7 are above ground potential, and discharge through the other optocouplers and through D's 1, 4, & 5, providing another separate pulse to the quench SCR's which activate a smaller capacitor through the coil, quenching the main Cap bank and stopping the coil in its tracks. However, I am not quite sure what value to give caps 5, 6, & 7.
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Triggering multi-stage v-swich coilguns
