Common Base Amplifier - Detailed Walkthrough and Parts Picking Advice - Simply Put

[@mandelbro777]

nice solution to your specific problem. go with what works and you can never lose.

[@keithking1985]

Oh Lovely!! & I haven't even Pressed Play on the video yet & already know its going to go into my favorites!!

[@romiam2423]

Great teaching. Looking forward to see the oszillator. Thank you for uploading.

[@LousyPainter]

All hail King Awesome! Great video my friend.

[@parapos]

great explanation, thank you.

[@1994Danilich]

Thank you for tutorial. I got a question considering resistor values. So, as I understand, simulation circuit is copy of real circuit from previous video (besides transistor itself), right? So I tryed to calculate all resistances by your method for 2N3904(Ic = 1mA, B = 125, Vce = 0.65V) transistor to get same values you are using. So Ic = 1mA, Ib = Ic/B = 8uA, Ie = Ic + Ib = 1.008mA. Chosen value for Ve = 1v? Cause it suits Re = Ve/Ie ~ 1kOhm. Next must be Rc. Should I think about this resistor as of Rc||RL? Or ignore RL for now? If do so: Vc = (Vcc-Ve)/2 = 5.5V, Rc = Vc/Ic = 5.5/1mA = 5.5kOhm... so where did you take 2.2kOhm then? And the 5.5v Vc is there, I can see it in simulation, so, probably I'm missing something -_-

[@keithking1985]

OK that was F'n brilliant.. really no joke'n, pure class. What was that simulator you were using??? it looked pure thome sham!! (Longford slang, Ireland. me home town) means it looks class dude! but serious whats the name of the sim please????

[@simplyput2796]

It's the Falstad simulator. Not as accurate as SPICE, but much more usable and useful for education. You can see the URL right there in the location bar of my browser in the video.

[@keithking1985]

@@simplyput2796 i was trying to the browser bar but could make it out.. Nice one!! & it is cool looking for what your doing with it.. keep it up!!

[@theGraphicAutist]

i need to amplify 1.7 MHz square wave at 24 volts for a mist maker. this seems like a good amp for it. or no?

[@scottneels2628]

Off topic question didn't know where to ask: I have a 50% Duty cycle 0-5v square-wave with varying frequency. How would I offset it on the time scale in either direction but retain the most recent source signal 5v on time? Ie. crankshaft sensor offset.

[@simplyput2796]

Your question is unclear. Is the signal with varying frequency a one-shot, or is it continuous in a cycle, or is the square wave a carrier and it's frequency-modulated? "Offset it on the time scale" sounds like altering the phase of the signal (making it happen sooner or later) but that implies it has a start point, and I have no idea what "retain the most recent source signal 5v on time" means. I can't parse that sentence. I looked up crankshaft signals and I see square waves, but I'm not going to absorb an automotive mechanic's discipline just by looking at that.

[@scottneels2628]

@@simplyput2796 Hi again, Yip it a phase shifter I'm after. I didn't know what it was called until you provided me the term in your answer thank you. There are other videos on the phase shifter circuit but could you please do one as you just make so much more sense to me.

[@simplyput2796]

I still need you to clarify what you're looking for, though. Shifting phase...relative to what? Shifting phase fundamentally is nothing more than a unity-gain amplifier (like a buffer) with a delay. Is that what you're looking for? A circuit that inputs a signal, but is always outputting the same signal but with a certain delay from when it receives it?

[@scottneels2628]

@@simplyput2796 yip that's exactly it. Relative to the input signal with the output delay at a set 0-180 degree even when the input frequency changes.

[@scottneels2628]

Hi again, I've been having lots of fun on the CircuitJS1 app. Thanks for showing us that. I ended up putting a mosfet delayed buffer on the signal which works to a point. It results in a delayed squarewave of the same frequency and amplitude as the original. I needed to pull up and down to get square corners back but it works. Do you think it would be possible to convert the original squarewave to triangle and then set the mosfet buffer to snap the fets on or off at variable voltage differential from referrence so no matter how short the duration the output signal is delayed proportionately in degrees of phase rather than the rc time?

[@jackwalton1975]

Why not skip the base capacitor and bias the transistor with a LED

[@discontinuity7526]

What would the world be without falstad