Design and Testing of Voltage Controlled Variable Gain Amplifier

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Design and Testing of Voltage Controlled Variable Gain Amplifier Using Differential Amplifier
  1. Smith Kerona
  2. Variable
  3. Gain
  4. Amplifier
  5. Transistor
  6. Circuit
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Комментарии
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I've watched a lot of long tailed pair instructional videos and this one is the best because it opens with a question and answers it while showing all work. It is a long video in comparison, but the details it expands on are the most important. Thank you!

foxburroughs
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Excellent. Theory calculations, practical demonstrations are very help full to understand. thank you

sanukarandes
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Excellent teacher, I'm learning a lot by the step by step procedures you take for each component, its really nice how you explain the details of the math involved to get the values, thanks for doing these types of videos.

myenjoyablehobbies
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Please keep making more of these videos - please keep 'them coming and thank you so much for taking the time to make them and share your knowledge with us!!!

chrisabad
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The only one VCA is working on my LTSpice :-) great video! Great Video and Explanation. TOP. YOu deserve a subscription definitely.

Not-Only-Reaper-Tutorials
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That was a really good walk through your circuit. :)

neeldey
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Fantastic explanation! You cleared up things for me so I SUBBED and rang the bell. Great job. Thanks.

LousyPainter
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Is there any off-the-shef part, which could be used as VCA?

odissey
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it is similar to an OP-amp in inverter mode. But what to control the gain with voltage, many ideas come to me, incredible.

Could you tell me if there is any IC that has this configuration?
And pairs of transistors of the same type, NPN or PNP, that are in the same package? I find it difficult to have pairs of identical transistors, I would have to buy many and see if they are identical in the same conditions of temperature and current.

Is the second stage to minimize the differences? I have to watch the video several times, my English is very bad.
Greetings.

a-job
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Hi, how do you calculate the gain of the 2nd stage? And what is the gain range of the whole circuit?

mandyabela