Following is the schematic for a power supply what I have put together for my amplifier build.
24v will power a TDA7498 Class-D 100Wx2 Stereo Digital Power Amplifier @ 4Amp max.
12v will run a preamplifire. 500mA max.
5v will run an Arduino Pro mini, 20x4 LCD and a real time clock module. I would say max of 500mA. Currently 7805 runs a bit warm (not hot).
Issue I'm facing is,
When I switch-on with "SW", I see +12v and +5v rails power spikes way above there intended values.
E.g.: +12v rail max peak around 20v and 5v rail max peak around 8v.
I had issues with many Arduino pro mini boards where it stopped working and some, I had to bun boot loader again to function.
So any thoughts to why I get high voltage spikes, even with liner regulators and please, if my design is not correct, I'm open for suggestions to fix and improve.