Re: Philips PM5519 Service info
Thanks again Hugo,
Have tried decoupling IC's 356/365, but this has not made any improvement.
I will try adding some more caps at relevant points.
I totally agree with you in respect of the analog/ digital power rails, first principles really.
I recently tried to use a tiny encapsulated "Quiet" (according to the manufacturers) SMPS on a vintage valve guitar amplifier. I was going to use it to supply a few miliamps at 12v to the reverb driver unit, which was transistor.
This was to replace a rather hideous w/wound resistor & power zener, that was dissipating too much heat.
The spikes on the 12v rail had to be seen to be believed, and nothing would get rid of them, so I went for a miniscule 'real' transformer & linear regulator, - problem solved.
I am beginning to think I should adopt a similar approach & feed the analog parts of the PM5519 from an entirely separate supply.
Too much hassle though!
I'll let you know how I get on.
Thanks again.
|