I am working on a Hadley 622C currently and came across this video. This is a very early solid state amplifier featuring a quasi-complementary output stage in a bridged configuration, almost exactly as you described at the end of this video and now I understand it much better, thank you.
@ElectronicswithProfessorFiore
2 жыл бұрын
Cool! That's reaching back a ways.
@thomaslockwood2950
Жыл бұрын
Love these videos
@rudygomez6996
Ай бұрын
Do you have video with example of these enhancements? I understand better when i see the actual numbers at each step of the process. Thank you
@ElectronicswithProfessorFiore
Ай бұрын
In that case, download my free textbook, Semiconductor Devices (link in the description). You will find more info on this topic.
@rudygomez6996
Ай бұрын
@@ElectronicswithProfessorFiorethank you!
@yousifali1737
2 жыл бұрын
nice video can I ask what reference book do you use?
@ElectronicswithProfessorFiore
2 жыл бұрын
Mine. It's free for the download. It's called "Semiconductor Devices: Theory & Application". Check out my websites for PDF and ODT downloads, or for a very low cost print version, head to Amazon.
@lesleypaulvj_TVPM
2 жыл бұрын
Please do the other transistor amplifier classes also. Thanks
@ElectronicswithProfessorFiore
2 жыл бұрын
Already did. Check the Semiconductor Devices playlist for class A and class D.
@lesleypaulvj_TVPM
2 жыл бұрын
@@ElectronicswithProfessorFiore Thank you. I was looking for class AB, which is suited for distortionless audio amplifier and class C for radio power amplification for ham radio. Your teaching method is good to understand.
@ElectronicswithProfessorFiore
2 жыл бұрын
@@lesleypaulvj_TVPM Class AB is a minor variation on class B. In fact, when I talk about reducing notch/crossover distortion by producing a slight forward bias, that's class AB. Class AB is not "distortionless" (no amplifier is) but it does offer a dramatic improvement. Class C is rather specialized, primarily used for narrow band radio transmission as you mentioned. The basic idea is to bias with a conduction angle less than 180 degrees. You can visualize this as just getting the tips of the waveform. The remainder of the wave is filled out using a resonant circuit which is tuned to the broadcast carrier frequency. The advantage is increased efficiency but it only works for relatively narrow band frequency ranges (like a radio broadcast channel). Not much use for something like audio.
@lesleypaulvj_TVPM
2 жыл бұрын
@@ElectronicswithProfessorFiore Ok, thank you very much. That did explain in brief what those classes are.
@cooliocrib4409
2 жыл бұрын
What are the frequency limitations of this circuit? How can you increase frequency?
@ElectronicswithProfessorFiore
2 жыл бұрын
Could you be more specific? Are you trying to change the upper or lower cutoff frequency? In general, I would refer you to the frequency analysis of small signal class A amplifiers. The issues are similar.
@cooliocrib4409
2 жыл бұрын
Thanks for the reply. So I want to use this topology to design a poweramplifier with a frequency range from 400KHz to 2.5MHz. I want to use +-15v psu rail and I want the output to be +-12v. What would limit the upper frequency limit?
@ElectronicswithProfessorFiore
2 жыл бұрын
That's a bit more involved than I can answer in a reply. I suggest that you start with chapter 6 of the Semiconductor Devices text for the general ideas and then look at exercise 21 in the accompanying lab manual which directly addresses some of these issues. In short, you're going to have reduce the input and output sections into equivalent lead and lag networks. There will be interactions between the resistors, coupling capacitors and the junction capacitances of the BJT.
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