LINEAR POWER SUPPLY TECHNICAL DESCRIPTION
1) Single Pole Mains Fuse
This fuse is found on the left hand side of the front panel. The fuse is held in a bayonet type fuse holder
which unscrews to give you 1 ¼ " x ¼ " 2A quickblow.
2) Filter
The filter IFCHI has two basic functions, these are:-
A) To attenuate any transient voltages present on the incoming mains supply.
B) To stop any conducted radio interference which may be generated within the power supply itself.
3) Double Pole On-Off Switch
The rocker switch which can be found on the left hand corner of the front panel.
4) Voltage selector
The voltage selector comprises of a single pole 3 way socket mounted onto the front panel. The voltages can
be selected by inserting the plug into the appropriate voltage position i.e. 200v, 220v or 240v.
5) Mains Transformer
The mains transformer is of the double wound isolating type with tapped primary accessible via the voltage
selector. The transformer has 4 isolated secondary windings for the unregulated and AC outputs. There is also
a center tapped, push secondary coil to feed the linear regulated circuits. The screen and core is securely
fitled to the main chassis using screws and spire clips.
6) Rectifiers
The rectifiers Rec 1 and Rec 2 are to provide unregulated voltage for both the reel and lamp circuitry. Both
rectifiers have a set of smoothing capacitors C9 and C14, and discharge resistors R20 and R21.
7) smoothing Capacitors
There are two large reservoir capacitors in the power supply, which smooth the unregulated voltage for the 5v
and 12v regulated supply.
8) Front Panel Assembly
A. Fuse Panel
Accessible via removeable front panel. Shown below are the fuse allocations and recterys.
FUSENO CIRCUIT FUSE RATINGS
F1 Monitor (when fitled) 2A
F2 Hopper 3A
F3 Synch 0.25A
F4 Triac 5A
F5 Lamp 5A
F6 Reel 2A
F7 Crowbar 2A
Note -all fuses cartridges are 1 ¼ " x ¼ " glass quick blow.
N.B. -isolate mains before removing front fuse cover.
B. Output Connections
The output connections are visible on the front panel and are marked from Con 1 to Con 4.
C. Reel Supply
The reel drive supply voltage is made up of Rec 1 D5- D8, i.e. 4x 1N 5402. The smoothing capacitor C9
2200 mf and the discharge resistor R20, 10K.
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