Unidirectional thyristor dimming light circuit triggered by unijunction transistor (2)

It is an improved single-junction transistor-triggered dimming light circuit based on the example r . It adds a transistor VT2 between
the relaxation oscillator composed of a thyristor and a stacked junction transistor , and uses VT2 to turn on and off to trigger the thyristor. , which can make the voltage across bulb E more stable.     VT】SCT1 or MCI{IOO 8 type directional thyristor can be used . vU can use 1BT33 single -junction transistor , requiring a dust-to-dirty ratio of ≥ 0 3. R- should use RJ-1W type metal film resistor, (, use CI. Ert 60V type polyester capacitor. RP should use linear potentiometer, there are no special requirements for other components.