[sdiy] BODE Frequency Shifter

Tim Ressel timr at circuitabbey.com
Sat Nov 3 16:56:38 CET 2018


I assume the 796 IC shown is a uA796. Is the uA796 the same as the MC1496?

On 11/3/2018 2:29 AM, atsushi maeda wrote:
> I am making BODE's one, now.
>
> Atsushi Maeda
>
> On 2018/11/01 7:11, Tim Ressel wrote:
>> 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




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