Farhan - it's still an excellent video and calculator - thank you!
?
Are there any rules of thumb about selecting the isolation resistor for the power input? I've seen from 10 to 220 Ohms. Is it calculated like a current limiter, or??
?
I've been experimenting with connecting multiple stages of amplifiers together.? I was surprised at the interaction between transformer coupled stages designed for 50 Ohms in and out. After tweaking a W8DIZ 2SC5551A amp for 17 dB of gain, gain of the first stage jumped about 5 dB after connecting? the second 17 dB stage. Does that sound normal?
?
There's art and science in this RF stuff.? Thanks for your work, and for easing the transition to W7ZOI'S feedback amp models.
?
73, Andy
?
On Sat, Jun 20, 2020 at 10:20 AM, Ashhar Farhan wrote:
Gang,
I have recorded a video on how to build feedback amplifiers. It is little?long. Do take a look if you are into homebrewing. I explain what a feedback amplifier is, how to choose the component values, how to build it and how to measure all the aspects like gain, input and output impedances and IIP3.
- f
