Inverter circuit four

It is a separately excited transistor inverter circuit , which can
be used for 8~40W fluorescent lamps. A self- excited multivibrator is composed of transistors VTi, VTz and capacitors Cl, c2, etc. , which
provides excitation current for transistors VT3 and VT4. This circuit can overcome the shortcomings of the circuit in Figure 2-121. The frequency and signal amplitude can be adjusted
by changing the R and C parameters of the multivibrator . According to the component parameters shown in Figure 2-122, it can be used for 8W fluorescent lamps.
    The voltage divider composed of resistors Rs, Ra, R7, and R8 controls the input signal amplitude i of VTa and VT4. Ra and R8
can also improve the stability of the output tube and avoid a vicious cycle in which the tube penetration current increases sharply when the temperature rises. .