I took a flash tube off the camera. How can I make a circuit to light it? (The lamp tube is intact and the original circuit is disconnected)

That should be a hernia light pipe. His circuit consists of boost charging and flip-flop. Low-voltage direct current is boosted to a high voltage of about 200v through an oscillating circuit and a transformer to charge the capacitor. Press the shutter, the voltage is boosted by the first step to break through other starts, and the electricity in the capacitor is instantly released to the lamp. It's a little troublesome to do this. Let's see where the original circuit is broken, and then repair it. In the flash tube, you can only flash, not always on.