'Universal' EasyCap is an ignition condenser suitable for use not
only in all types of magneto (rotating-coil, rotating-magnet and
flywheel), but also in battery-coil ('Kettering') ignition systems.
It is designed so that it can be shaped to fit wherever the space
permits. In view of its high-tech ceramic capacitor, the Universal
can be expected to last far longer than the humidity-affected paper
condensers that have traditionally been used in recent decades.
The 'universal' EasyCap consists of a 1.8"
square of FR4 (glass-reinforced epoxy) circuit board, clad with
tinned copper on both faces, and with its high spec. capacitor
soldered to the top of the circuit board adjacent one edge. The
outer terminal of the capacitor is connected through the board to
the bottom layer of copper. The inner terminal of the capacitor is
connected to the top layer of copper outside the little green
available as standard with a capacitance of 150 nF (0.15 µF) and 220 nF (0.22 µF). Other values can be made to special
order at a premium. The capacitors are rated at 630 V dc, and the
universal EasyCap has an operating temperature range of -55 to 125 °C.
If you do not know which capacitance is required for a particular
application, a rule of thumb seems to be to use 150 nF for
rotating-coil magnetos, and to use 220 nF for rotating-magnet and
flywheel magnetos, and for battery-coil systems.
The board can be sawn, ground and/or sanded
to any desired shape. The bottom of the board is marked with a grid to
assist in laying out. The board can be drilled to receive one or more
screws which can serve to mount the EasyCap and/or make electrical
connections to the copper layers. In many applications, the universal
EasyCap can be used to replace an existing insulating plate or washer under the head of fixing screw
in the contact-breaker assembly so that the EasyCap is not only held
in place, but the electrical connections are made automatically. Wire
can be soldered to either of the copper layers, but in most
applications this will not be necessary.
The area occupied by the capacitor is extremely small, so that the
capacitor can be tucked away in a very small space. The area of the
board is relatively large to give the maximum flexibility in designing
a condenser for any specific use. In most cases, the vast majority of
the board will be cut away and discarded.