[sdiy] BODE Frequency Shifter
shine32 at kr.tcp-ip.or.jp
Sat Nov 3 10:29:26 CET 2018
I am making BODE's one, now.
On 2018/11/01 7:11, Tim Ressel wrote:
> which one are you making?
> 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?
>> Atsushi Maeda
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