High Voltage Generator Using SIDAC (ART245E)

This circuit was originally included in my book Mechatronics for the Evil Genius (TAB 2006) to be part of the article Ionic Motor. See more about the Ionic Motor in this site.

Silicon diodes for alternating current (SIDACs) are negative-resistance devices with characteristics similar to those of a neon lamp. The main difference is that they are solid-state devices that, When triggered, can conduct currents.

A relaxation oscillator, such as the one used in the SCR version (ART244E), can be made easily, as we can see in Fig-1.


Figure 1
Figure 1


The circuit can be powered from 117 VAC or 220/240 VAC according to the used SIDAC. The operating principle is simple to understand: The C1 capacitor charges across R1/P1 until the trigger voltage of the SIDAC is reached. When triggered, the capacitor discharges across the primary coil of the transformer, producing a high-voltage pulse in the secondary coil.

The primary coil of the transformer is made in the same manner as in the project using the SCR: 8 to 12 turns of common plastic-covered wire. You can also replace the flyback transformer With a car ignition coil in this project as you might have done in the SCR project (ART244E).


SIDAC - NTE7419 (110 V), K1200 G (110 V), or K24OOG (220 V)

D1 - 1N4004(7) silicon rectifier diode

R1 - 1 k x 10-watt (2.2 k x 10-watt) wire-wounded resistor

F1 - 10 k wire potentiometer

C1 - 8 to 32 µF x 200-volt (400-Volt) electrolytic capacitor

T1 - Flyback transformer (see text)

Power cord, terminal strip, box, knob for P1, etc..

Values between brackets are for the 220/240 VAC power line.



Circuit Bench