Hi.Nice video. It would be nice to see how the amplifier was designed. what was the design specifications and how those values turns out in practice. probably you can do a prequel video showing all that hidden stuff
Hello friend, in this video I didn't say which transistors were used in this assembly, I calculate that there may be a video that talks about this assembly and I would like you to put the link if possible or inform what they are. Great video, I already liked it. Thanks
Hi Gregory Thank you for this very interesting video. So you are using a BF199 in common emitter mode. My 2 questions : - How did you calculate the values for biasing the transistor ? - I did know that the gain is decreasing with the frequency, but is there any formula to approximate it without the spectrum analyser ans the signal generator ? I will use it at about 130 MHz. Also one remark : you are using 1 nF input and output capacitors. So I am expecting that these values are too high for the tests for high frequencies. Depending on the manufacturers, the BF 199 has a Ft (transition frequency) at about 400 Mhz. Thanks in adavance for your answer ! Philippe
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Great video! It would be interesting to talk about neutralizing capacitors and matching networks.
Nice! We will approach these topics in next videos. Thank you!
Hi.Nice video. It would be nice to see how the amplifier was designed. what was the design specifications and how those values turns out in practice. probably you can do a prequel video showing all that hidden stuff
Hey man, I have other videos showing that. There is one video called "how amplifier work" something like that - take a look here on the channel ;)
What a out the losses of the cables involved at the source and spectrum analyzer?
Hello friend, in this video I didn't say which transistors were used in this assembly, I calculate that there may be a video that talks about this assembly and I would like you to put the link if possible or inform what they are. Great video, I already liked it. Thanks
Hello friend! In this video I used an old BF199 transistor.
@@AllElectronicsChannel Thanks.
Hi Gregory
Thank you for this very interesting video.
So you are using a BF199 in common emitter mode.
My 2 questions :
- How did you calculate the values for biasing the transistor ?
- I did know that the gain is decreasing with the frequency, but is there any formula to approximate it without the spectrum analyser ans the signal generator ? I will use it at about 130 MHz.
Also one remark : you are using 1 nF input and output capacitors. So I am expecting that these values are too high for the tests for high frequencies.
Depending on the manufacturers, the BF 199 has a Ft (transition frequency) at about 400 Mhz.
Thanks in adavance for your answer !
Philippe
Great video, is the schematic of the DUT somehwere? Would be nice to replicate and test along!
If I'm no mistaken it is a simple BF199 common emitter!
@@AllElectronicsChannel Thanks! Will conjure something up and report back
Which transistor used in amplifier. Can we use for FM radio
This was an old BF199, it works good for FM
@@AllElectronicsChannel thank you sir
is the gain same as small signal gain?
Yep, it is the small signal gain squared, when the input and output are presented with 50ohm
It should be |S21|, but great video anyway!
Thx!
Indeed! Thank you!