Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1292
| Posted: 04:49pm 02 Jul 2024 |
Note Edited;
Here we go again, latest BOMs and schematics for Variac and Inverter controllers. disco4now has fed back some missing lines R1,2 & 3etc in the Variac BOM - dont know how or why they went missing but now they are back!
I have included the extra 1K resistor and 8V2 zener in both controllers parts list BOMs that go with the 5V linear regulator with enable (KA78R05). The picture below shows what the mod might look like for the Variac PCB.
To clarify a point I have never had code corruption in normal usage with either the Variac or Nano controller, ditto for Poida and KeepIS, so using the 4 pin linear regulator Mod or and supply rail monitors may be seen as overkill, so you can always leave them all out and just build it normally & see if there is a problem first before a preemptive cure for what problem ? At least if the problem appears we do know how to resolve it.
The 3 holes to the right of R52 are the original mounting holes for PS2, the 3 pin Reg.
VR1 (KA78R05) is mounted by bending 2 pins forward (In, Out) to go into PS2s outer 3 holes, 1 backwards (Gnd) and Enable is a floating termination of D11 & R52
I also included the 2 x +5V supply rail monitors in the BOMs, 1 for the Nano LCD module, the second for the controller Nano module. I recommend mounting the rail monitor for the Nano controllers on the underside main PCB Nano socket pins. The LCD one does not matter if you put the rail monitor on the module pins directly or the interface PCB as they are soldered direct to the PCB.
Latest BOMs and Variac Schematic with 5V Mod
WG45Rev2A Schematic.pdf
WG45Rev2A WG44Rev2 BOM.pdf
WG39R7 WG44R2 BOM.pdf
Edited 2024-07-03 12:03 by wiseguy