Please take a look at my radio design

Nigel Goodwin said:

Electronman said:

Your second opamp is already giving exactly the same input impedance as the first one, which is why the first one is doing absolutely nothing.

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SO I should ask why we Buffer op-amps are used in electronics?
What is a buffer? Is not it a current amplifier with voltage gain of equal to 1.

No, that simply alters the tuning.

You won't get any quality, it's AM

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I meant using 2 coil on one core, one with several wounds and the other with higher wounds

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Bob Scott said:

Also, the TL074 op-amp has a GBP of 3 MHz, so maximum gain at 1.6 MHz is only 2X, or 6Db. Use a faster op-amp.

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Electronman said:

Nigel Goodwin said:

SO I should ask why we Buffer op-amps are used in electronics?
What is a buffer? Is not it a current amplifier with voltage gain of equal to 1.

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Generally a buffer has a gain of one, a high input impedance and a low output impedance. But as your amplifier has EXACTLY the same input impedance as the buffer, the buffer is doing absolutely nothing.

I meant using 2 coil on one core, one with several wounds and the other with higher wounds

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To what purpose?, if you mean to create a transformer?, then you don't need the high input impedance of the opamp.

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