Plan C | Building and Fitting a Bwack C64 Saver v2.4 @Plan-C | Uploaded August 2019 | Updated October 2024, 1 hour ago.
Thanks to Bwack for open-sourcing version 2 of his awesome C64 saver!

In this video, I build one, do a quick test and then fit inside a previously repaired C64.

A lot of work went into the design of the Bwack saver and it's predecessor, the Ray Carlsen saver. They are both designed to protect a C64 from a failing power supply which can kill irreplaceable chips through over-voltage.

Plenty more info at:

Bwack Saver v2 Github:
github.com/bwack/C64-Saver-bwack

Carlsen Saver (plus Mobo fitting instructions & loads of other stuff):
portcommodore.com/rcarlsen/cbm/c64/SAVER

Thanks to Bwack and Ray for keeping these machines alive.

Here is the BOM I got from the schematic:
Q2 = IRFR5305 (SMD)
Q1 = 2N7000
D1 = TL431
C1 = 47uf 16V
D2 & D3 = 6v8 Zener
R1 = 3K9
R2 = 3K3
R3 = 3K3
R4 = 330K
R5 = 3K3
R6 = 3K9
R7 = 33K
R8 = 82K

No 0.1uf cap required

Good luck all.