Negative oxygen ion generator

Circuit Operation Principle The negative oxygen ion generator circuit consists of a power supply circuit, a multivibrator, and a high voltage circuit, as shown in Figure 9-118.

The power circuit is composed of capacitors C1, C2, a resistor R1, a Zener diode VS, and a rectifier diode VD1.
The multivibrator consists of transistors V1, V2, resistors R2-R5 and capacitors C3, C4.
The high voltage circuit is composed of a capacitor C5, a resistor R6, a potentiometer RP, transistors V3, V4, a high voltage transformer T, a high voltage rectifier diode VD2, and high voltage discharge electrodes a, b.
After the AC diode is stepped down by Cl, VS regulated, VDl rectified and C2 filtered, it provides l2V DC voltage for the multivibrator and high voltage circuit.

The multivibrator is oscillated after being energized to generate a high frequency oscillating signal, which is applied to the high voltage transformer T through R6 and RP, so that V3 and V4 are alternately turned on, and a pulse high voltage of several thousand volts is generated on the W5 winding of T. After the high voltage is rectified by VD2, a DC high voltage is generated and applied to the discharge electrode to ionize the air to generate negative oxygen ions.
Component selection
Rl-R6 uses 1/4W metal film resistor or carbon film resistor.
The RP uses a small synthetic carbon film potentiometer or a variable resistor.
Cl selects a CBB capacitor with a withstand voltage of 450V; C2-C4 selects an aluminum electrolytic capacitor with a withstand voltage of 25V; C5 uses a polyester capacitor or a CBB capacitor.
VDl selects 1N4007 silicon rectifier diode; VD2 selects 2DGL14kV high voltage silicon rectifier diode.
Both Vl and V2 select S9013 silicon NPN transistor; V3 and V4 select DDO3 high back pressure silicon NPN transistor.
VS selects silicon steady voltage diode of lW, l1-l2V.
T can be modified by using a separate line output transformer of black and white TV: Wl and W2 windings are φ0.35mm enameled wire and wound around 5 turns, the head and tail of the coil are connected as the center tap; W3 and W4 windings are used φ0.35mm The enameled wire is double-wired and wound around 25-30 匝, the head and tail of the coil are connected as the center tap; the WS winding uses the high voltage package of the original output transformer.
The discharge electrodes a and b were fabricated using a copper clad plate and a plurality of pins.