Last modified: 17 Jan 2012

Warning This Project Has Changed Again!

Still working on a new prototype hence no pix yet.

Also to see Maplin Millennum 4-20 and Newton Preamplifier original magazine articles click here

WARNING: ELECTRIC SHOCK HAZARD Working with high voltage is dangerous! Never poke your fingers into a live circuit! Adopt a proper safety procedure and follow it every time – before the circuit may be safely touched, switch off the mains and pull the plug. Then make sure that the HT voltage has discharged to at least 50V; if necessary discharge with a resistor (not a screwdriver!). The proper industrial procedure includes shorting the HT with an earthing strap, you could do this but don't forget to take it off before turning the power back on. (Alternatively a high value discharge resistor, say 1MΩ, may be permanently incorporated into the power supply.) This procedure follows the acronym S.I.D.E. – "Switch off, Isolate, Discharge, Earth". Don't cut corners!

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