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Buffer stage for a VFO/Local oscillator in the 14 MHz-18 MHz band (schematic)
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The video shows an extra buffer stage that was necessary to decouple the VFO/Local oscillator to keep the oscillator (very) stabile and amplify the output signal somewhat (2x) so that it could be properly injected in the base from the mixer transistor (watch earlier video), connected to the IF amplifier on say 450 KHz.
That IF amplifier was published in:
The signal from the local oscillator is (in this case) not (!) injected into the emittor from the mixing transistor but into the base, via a capacitor from 100 pF (foil type).
All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is
In thematic order you can find these video’s under the “comments” section. My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.
My books are also available via Barnes and Noble and via Amazon. Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits.
Be aware of that, I saw on the internet many of my circuits reproduced in a poor or even not proper way. I can not help that, sorry. Upload 21 May 2018.
That IF amplifier was published in:
The signal from the local oscillator is (in this case) not (!) injected into the emittor from the mixing transistor but into the base, via a capacitor from 100 pF (foil type).
All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is
In thematic order you can find these video’s under the “comments” section. My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.
My books are also available via Barnes and Noble and via Amazon. Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits.
Be aware of that, I saw on the internet many of my circuits reproduced in a poor or even not proper way. I can not help that, sorry. Upload 21 May 2018.
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