I'm looking to assemble a capacitor charger in a nice, durable enclosure. I already have the DC to HV DC converter. I'm just looking, now, for a way to indicate when the capacitor is fully charged, practically identical to how a flash-enabled camera indicates when its capacitor is charged and ready for flash. I'm not an electrical engineer, as such, I've thoroughly searched the big G for schematics or diagrams of this circuit and have come up empty handed. I'm sure it's rather simple and involves the manner of which the capacitor blocks DC current flow once the capacitor has been charged to the voltage of the source. Any hints or help would be greatly appreciated! Thanks in advance for your time.