This is an electronic neon bulb circuit. Two transistors No. 13003 were changed. Two quarter-watt resistors, 15 ohms. The rest of the resistors and diodes are good. When connected, the bulb lit for a few seconds, then a spark came from the two transistors 13003, and I found that they were shorted. Also, the two 15 ohm resistors burned out. What is the cause of this malfunction? Note that two chemical capacitors were checked, they were good, all diodes were checked, and all resistors were checked.
i dismantled 3 green ceramic capacitors and measured them with an multimeter, and they gave the correct results
2A333j = 33nF
222j = 2.2 nF
682j = 6.9 nF
i'm not sure what is the cause of this failure, this is the second time to change 13003 transistors.
i dismantled 3 green ceramic capacitors and measured them with an multimeter, and they gave the correct results
2A333j = 33nF
222j = 2.2 nF
682j = 6.9 nF
i'm not sure what is the cause of this failure, this is the second time to change 13003 transistors.