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Looking at that two phase sine wave shows a positive (+) gap (180 to 270) that three phase does not suffer from. So you get more power from three phase with less wire. Also less pulsation when you get rid of the gap.
The common base amplifier is great when you want an extremely low input impedance amplifier. I used one mucking around to amplify an 8 ohm speaker to use it as a microphone. Worked excellent
I think that he's expecting the OP amp to deliver a bit too much driving current in this application so that would be a source of distortion when the output is loaded as the gain of the transistors drops. You are correct though, just only gently load the OP amp and use a fast OP amp so the slew rate corrects things
i posted a few comments that became redundant as I watched the rest of the video, so I deleted them. So here we go... take 3 😅 I like the idea of using incandescent bulbs as a load. I have a heap of trailer bulbs I might wire up for the same purpose. You might be interested in trying bootstrapping to get it to swing better to the rails. Also output parasitic snubbers would be good. One last thing that would be interesting would be to use a fairly high slew rate OP amp and see how well the negative feedback corrects the crossover distortion WITHOUT any bias. You may be surprised since you're using Sziklai pairs which have a base emitter junction voltage of 0.6V or so. The distortion may remain inaudible. I made a bias less 1W amplifier once using an NE5532 once and I couldn't hear it's distortion because of this corrective action of the feedback
If there is a problem on the power side, can it go backward and cause a problem at the signal source? I would like to use that circuit for a signal generator.
Hi good morning the capacitors that I’m looking 👀 is have different specifications: black 20 yellow 15 blue 15 and all say 200 mfo and 65 c how I can read this?
Does an dc direct coupled emitter follower work the same way as a dc direct coupled cathode follower? That is, ”stealing” current from the previous stage, rendering a rounded off signal, i e compression?
hi thank you very much for this great video Sorry for my ignorance but what are the benefits of using a pair of Sziklai pairs instead of a pair of complementary darlington at the output ? moreover have you simulated the circuit ? do you think that simulation SWs can provide results close to reality ?
The Sziklai has less Vbe on voltage as there's only one junction instead of two base emitter junctions in series so it's easier to avoid the cross over distortion.
@@Dazzwidd hi thank you very much for your kind and valuable advice I have looked at some service manuals of vintage preamps and i see that the Sziklai pair was quite popular in the late '70s line preamps are gain stage and buffer stage Today symmetric topologies are more used I wonder why because many still use cap coupling both at input and output There is a competition to design and build the best discrete op amp i.e. with the lowest THD+noise Even if opamps are very tough to beat Kind regards gino
@@gino3286 There's nothing asymmetrical about the Sziklai pair. The symmetry comes from the transformerless push pull output configuration so if you're concerned about symmetry you use a sziklai in the top and bottom half, but you use the compliment sziklai so there's in one an npn/pnp and in the other a pnp/npn. Tell me, have you seen the John Audio Tech channel? It's pretty educational if you want to learn
@@Dazzwidd hi thank you again Yes i understand your advice It is implemented for instance in the old Onkyo P-303 preamp output stage What would be the gain of doubling the single ended circuit ? less distortion ? higher PSRR ? I will look at the channel you mention with great interest I have recently discovered LTSpice Just for curiosity i am trying to simulate some very famous preamps and buffers to see their THD performance at sim I understand that sim is not the reality But it could be useful if used properly Kind regards gino
@@gino3286 So Gino, did you get to see that channel? He covers the Sziklai a bit and there's a fair bit of experimentation and scope analysis. I think you'll be in heaven
Very helpful, thank you. I have programmed several of these Micro810's and recently fitted an LCD in one. I guessed the LCD did more than look pretty in the front but wasnt sure how to use it but now i will give it a try.
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Hi Sir, if the load is considered as a RC circuitry, such as the MOSFET, as we know that the current will be almost zero when the ciss of the MOSFET has been fully charged via Rg at the timing of 5 times tau, at this moment, how to confirm BJT still can operate in forced beta condition?
A very useful, well explained video. Thanks for your efforts! I have a very simple question, can you recommend any high power igbt to replace the TIP42 and TIP41 transistors used in the circuit?
The affinity of a system to acquire low energy state is a concious decision inbuild to any system governed by universal laws, because low energy state will lead to increase in entropy of universe which is the end goal of any universe, to convert all energy to entropy and become cold and eventually die
Great video man! I have an AD2 I want to use to match n-channel MOSFETs. It seems the transistor test adapter board supports this, but I'm unsure if I can use your circuit to do this or not without modification. Also if I understand correctly at least for p-channel MOSFETs, base is gate, collector is drain and emitter is source, is this the same for n-channel? Here is the title on digelents site Comparing a BJT and a MOSFET with the Transistor Tester Adapter. They also have a schematic for the curve tracer PCB you can see. I suspect I will need to modify your circuit just not sure how yet..
I was watching on my phone before and didn't realize they actually show a rudimentary circuit diagram for those who don't have an adapter at at the top :) And when I select N-FET it even gies an updated diagram. Digilent sure is thorough! :)
Just another note, if you change the thing you are measuing Id/Vds or Id/Vgs, it actually shows you a new diagram telling you how to wire things up! Their adapter looks cool cause it auto changes the wiring for you with relays.
I would understand the presence of X-over distortion in case the feedback path would be connected to the output of the lm358 instead of the circuit output. In the configuration you show, there is a lot of global negative feedback due to the high amount of open loop gain. Distortion should be very low?
Hi nice video. Thank for the effort. two question. How do you choose for that type of transistor Ic to be 7mA. Is it a rule of thumb or evidence in the datasheet? And why Ib a fraction of the beta DC gain? best regards
usually the peak efficiency is around 70-80% load, as it shown in your own data, where on 3/4 load only consume 2/3 of the fuel: a 12.5% improvement over 100% load. Operating at full load also decrease the engine components lifespan and maintenance interval exponentially.
Nice video. But I got one question here. In the video you mention the efficiency of the battery and the inverter. So do you mean the round trip efficiency of both battery and the inverter？
Hi APDahlen, Thanks first for the great video. At next i would be interested if you might further explain about biasing and resistor value calculation. That is if somebody wants a different output capabilities (current), voltage gain (R9/R2), different Q1 and Q2. I have not simulated or built this circuit but would be great to do it.
