Ex workshop spare parts and small manufacturing stock
ALL components were sourced through reputable local distributors such as RS Electronics, Farnell, WES and Rockby (Victoria) or direct from the manufacturer, these transformers were direct from Harbuch. It does appear that Harbuch has either closed down or in "transition" as I believe Rod retired and their online website seems to be " in limbo" - shame, great Australian manufacuturer!
HARBUCH ELECTRONICS (Sydney - Australia) - Toroidal Power Transformer
Made in Australia
Model: F2412H
Two labels on the side
Label 1 (Safety Standards)
AS3108-1994 CS/776/Q
EN60742 919691
Primary winding: 240V AC input
Label 2 (Technical Info)
HARBUCH ELECTRONICS PTY LTD
ANTRIM F2412H 160VA
PRIM 240V ORG-ORG
SEC1 12V RED-YEL
SEC2 12V BLU-GRY
Dual (Isolated) secondaries: 12V 80VA (around 6.5A) each winding
All windings are colour coded and easy to identify (marked on the toroid transformer label)
Orange - Orange: 240V AC Primary winding
Secondary 1: Red & Yellow
Secondary 2: Blue & Grey
NO mounting hardware supplied (rubber or plastic discs, metal disc and central bolt)
Physical measurements:
110mm diameter
33mm centre hole
40mm height
All flying leads 190mm length
Primary leads enamelled copper wire, solid core
Secondary leads 1.9mm diameter enamelled copper wire, ends tinned
Transformer has a packed weight of 2Kg
COSMETIC CONDITION:
NEW, never used
I have stripped back the insulation on the orange primary leads so I could make my test measurements below.
TESTING:
To confirm the transformer is functioning properly, I have made some simple "open circuit/no load" tests.
Secondary 1: 12.81V
Secondary 2: 12.81V
Confirmed total isolation between Primary & Secondary windings (NOT an auto transformer!) and both secondaries are separate windings.
NOTES:
Harbuch always shows the first colour as "start of winding" so to connect these in series to achieve 24V output, join Yellow & Blue and take your output from Red & Grey
Just as easily you can connect both windings in parallel to provide the same output voltage (12V) but with increased current capability - it is very important to get your phasing correct here, this is when the colour coding comes in VERY handy!
