Because the old thread was closed at the time when I was writing this post. So I decided to start new thread.
Old tread
https://www.electro-tech-online.com...an-blacks-two-transistor-switcher-design.html
The circuit that I build on the breadboard look like this
**broken link removed**
First the voltage at Q2 base for C1 = 4.7nF; C2 = 1nF ; L = 3.3mH
**broken link removed**
Q2 base voltage for C1 = 4.7nF; C2 = 2nF ; L = 3.3mH
**broken link removed**
Voltage at Q2 base without C1 capacitor
As we can see without C1 circuit operate at at a higher frequency.
**broken link removed**
Next I change the coil inductance from 3.3mH to 220μH
Voltage at Q2 base when L = 220μH
As we can see the osculation frequency has change again.
**broken link removed**
And I also measure the voltage across coil terminals and the current that is flow through the coil. I measure the coil the current via 1Ω series resistor.
That all I have for now.
Old tread
https://www.electro-tech-online.com...an-blacks-two-transistor-switcher-design.html
The circuit that I build on the breadboard look like this
**broken link removed**
First the voltage at Q2 base for C1 = 4.7nF; C2 = 1nF ; L = 3.3mH
**broken link removed**
Q2 base voltage for C1 = 4.7nF; C2 = 2nF ; L = 3.3mH
**broken link removed**
Voltage at Q2 base without C1 capacitor
As we can see without C1 circuit operate at at a higher frequency.
**broken link removed**
Next I change the coil inductance from 3.3mH to 220μH
Voltage at Q2 base when L = 220μH
As we can see the osculation frequency has change again.
**broken link removed**
And I also measure the voltage across coil terminals and the current that is flow through the coil. I measure the coil the current via 1Ω series resistor.
That all I have for now.