LOW PASS FILTER

摘要

PURPOSE:To attain cost-down by selecting the connection position of a Zener diode and utilizing a connecting capacitance of the Zener diode so as to constitute a pi type filter. CONSTITUTION:The connecting position of the Zener diode 7 is arranged to an output terminal of a coil 6. Then the pi type filter is formed by the connecting capacitor 8 of the diode 7, a capacitor 5 and a coil 6. A filter for an abnormally high voltage comprising the diode 7 acts like the similar effect as in a conventional filter even in the circuit above.