I actually do hate any circuit linked straight away to 240v mains. Even so Christmas tree light fittings have been associated straight away to the mains for years and ages without any subsequent significant problems.
Casing has to be offered and the light bulbs (LEDs) has to be away from the reach off prying hands.
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COIL DESIGN

Any coil used in a crossover network has a certain amount of dc resistance — and this resistance will dissipate a proportion of amplifier power.

Method of Heating
1. Non-Ferrous Metals ·such as duralurnin and aluminium are heat treated in at salt bath. This
is a mild steel bath containing a mixture of potassium and sodium` nitrates, which is
heated by gas, oil or electricity.
Heat Treatment of Duralumin‘
2. Annealing. This operation permits the material to be worked and bent. Duralu-
min is annealed in a salt bath at a temperature between 36O C and 400%] and then quen-
ched in clean cold water.
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