[sdiy] BODE Frequency Shifter

[Tim Ressel]

which one are you making?

--curious

On 10/30/2018 3:45 AM, atsushi maeda wrote:
> Hi Lists;
>
>
> I am currently producing BODE Frequency Filter.
> I made the board, but I am troubled with adjustment.
> Most of the constants are in accordance with the manual.
> Some of the operational amplifiers have been changed to LF 412, NJM 
> 2114, NJM 2748 A, etc., and 741 is not used.
> Transistors have been changed to 2SA 2015 for PNP and 2SC1815 for NPN.
> The current problem occurred when adjusting DOME Filter.
> It may be adjusted so as to have a phase difference of 90 degrees at 
> 40 Hz, 170 Hz, 725 Hz, 3080 Hz, 13090 Hz, but if I adjusted it to 90 
> degrees phase difference at 13090 Hz, the phase difference will be 90 
> degrees at other frequencies It will not be.
> No matter how many times you try to adjust it, it will not change.
> Is my understanding wrong?
>
>
> Cheers,
>
> Atsushi Maeda
>
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com