In car ioniser - fresh air on wheels

in-car ioniser elektor december 1982 — 12-45 in-ear fresh air on wheels The circuit is one way of increasing the concentration of negative ions in the surrounding air, resulting in improved mental concentration, and reaction speed making roads just that little bit safer. At the very least it will refresh the environment. a square-wave signal with a frequency around 85 to 100 Hz. The values of R1 and the combination of P1 and R2 have been chosen so that the square- wave produced is symmetrical. This is then fed to transistors T1, T2 and transformer TR1. The result is an a.c. voltage across the two secondary wind- ings of the transformer of approxi- mately 400 V (square wave). Figure 2 shows the circuit diagram of the ioniser which consists of a 27 stage voltage multiplier, in order to step up the voltage from 400 V to around duce ozone (03). This can on the one hand have certain advantages as it oxidises organic gasses. Carbon monox- ide for instance, can be reconstituted into ca...