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Hello
Now I have a new problem. The curve of the second preamp stage does look false. The following picturesy are oscillograms of my curves with different amplification of my scope. the yellow curve is from the first preamp stage and the blue from the second stage:
On the middle wire of R6 i get a voltage from about -1.5 to +1.5 volt. in the video you can see waht hapens if turn R6 from his minimum to his maximum:
When I replace the op the mistake does not apear. Using other coils doesnt helps too. I testet the second pramp stage with some test signals the results are in the following pictures:
I rebuild the circuit with the same components in a breadboard and get the same result. there i testet the first preamp stage the results are in this picture:
In the next picture is the row signal behint the diodes
by Levin
Now I have a new problem. The curve of the second preamp stage does look false. The following picturesy are oscillograms of my curves with different amplification of my scope. the yellow curve is from the first preamp stage and the blue from the second stage:
On the middle wire of R6 i get a voltage from about -1.5 to +1.5 volt. in the video you can see waht hapens if turn R6 from his minimum to his maximum:
When I replace the op the mistake does not apear. Using other coils doesnt helps too. I testet the second pramp stage with some test signals the results are in the following pictures:
I rebuild the circuit with the same components in a breadboard and get the same result. there i testet the first preamp stage the results are in this picture:
In the next picture is the row signal behint the diodes
by Levin
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