Xenobius
Member level 5
I'd suggest a pragmatic approach. Remove C5 and check if the circuit is behaving according to your needs.
If you look at LM317 load transient response your 2 ms rate is the
dominant system characteristic. The 317 is more than capable of
handling that.
View attachment 163156
Regards, Dana.
Hi Dana,
This is very good news to me I was trying to understand this. I think your 2mS comes from 1000mS / 490hz = 2.04mS and as your diagram shows from the datasheet the LM317 can stabilise in around 8uS so as my initial experiment showed it can work perfectly.
Tonight I plan to desolder the diode and capacitor, replace all the transistors because those that did not blow up have a dark mark on their surface and will try again. I have a feeling the LM317 also got a beating. I'm not sure if I should just replace all 10x LM317 or not. I have some spare so I might as well get rid of the doubt.