Thank you so much for providing such a great service to the radio enthusiast community. The information is excellent as well as the presentation. Your explanations make it crystal clear. Thanks again!
in audible frequencies that can go up to 20 khz the transformer's inductance can filter the audio so the transformer must be designed for high frequencies.
The 180° phase shift is because the amplifier is a common emitter configuration. I have a number of videos that show signal phasing. This is the title of another video. 'Audio Phasing, Important and Useful'
Now I am intrigued. I'm sure that this must be a very simplified schematic for an amp...but I can actually read this and see what is going on. This just might be doable!
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Thanks for sharing video > Just curious wondering,..could this output instead been explained as; An alternating- 'sink_sink' ( pull_pull ) ? ... ..It seems like the highest positive voltage potential is connected to center-tap of speakerTransformerWindings, and thus the two BjTs instead 'alternating' -"supplying-sink" on the endpoints of inputSide speakerTransformer. __Not 100% sure,..but could it be so ? (..looking at schematics at ca 4min into video)
Why that complicated resistor / capacitor network on the emitter of the first transistor? I've seen other circuits (like in the popular HX-108 kit) where the emitter goes straight to ground!
@@AllAmericanFiveRadio How? i know that in tubes you have to know the Plate resistance to determinante the primary impedance, would be the same or similar with transistors?
@@omarcusihuaman4261 Yes. Vacuum tubes vary mostly voltage and a little current. Transistors vary mostly current and a little voltage. So the impedance of transistor circuits are much lower than vacuum tube circuits.
To make this video I used Adobe applications. To make the drawings I used FreeHand. Once all the drawings are made I put them in Photoshop Elements to put them in the proper order and size. Then I use premiere elements to animate the drawings and make the video. The only program that I use that is not Adobe, is the DAK sound recorder and editor.
I got this circuit from a Zenith radio. I have done a number of videos on biasing transistors. When you want to build something the first question is, what is it you want the output to drive? What you're going to drive with the transistor, the battery you're going to use, the signal, all influences the design of the circuit. This is where the datasheet for the transistor is very handy.
