Cascade Amplifier

142

02:43:48

Why this amplifier doesn't work? T.T

published 12 years ago

pip

12 years ago

No dc bias to the final transistor its turned off. If you turn up the input to about 0.5v to overdrive the output transistor the ac will turn it on and you will have output but it will be very distorted.

SoMang

12 years ago

Yes u r right! Then, what makes distortion? I wanna remove distortion..

pip

12 years ago

For audio transistors must operate in their linear region otherwise if you operate them outside of this you get non linear distortion. What you seen with your amplifier when you turned up the input was a rectification of the input signal because the output transistor is biased off and so outside of its linear region so it's working as an amplified diode.

SoMang

12 years ago

Haha an amplified diode.. Great explanations. I'll try to make perfect one. Thanks!!

Voltransistor

12 years ago

On the PNP transistor capacitor can't discharge so it stops the wave and the top resistor has to be lower resistance.

SoMang

12 years ago

Yes capacitor beetween tr1 and tr2 is misplaced. I misunderstood the circuit. What register do you point out?

pip

12 years ago

Delete cap on the emitter and base of pnp transistor then connect pnp base to collector of first transistor.

pip

12 years ago

I have made some improvements to your circuit by changing the topology it's more linear with higher stability and gain of 225. Search for somang Cascade to see.

pip

12 years ago

I will be deleting this in a couple of days so if you want a copy get it soon.

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