Hello, I was searching for a very good volume Attentor and didn't find something usable and well priced on the market.
My Goal is a "simple" active Volume controll with very high part quality and a negable difference between right and left channel.
A few Day's ago, i found those Volume Attentuator:
High Quality Audio & Industrial Attenuators
Now i started to think about the schematics. The Opamps in the front are not choosen out till now.
My idea was a operational amplifier for a high input inpedance and with some trimmers to get a CMRR>60db. The DC servo is to handle a DC offset of +-100mV (but i need to calculate it again). Do you think it is possible to get a high CMRR with DC Servo in one stage?
The Output stage uses a 1632 to get a symmetrical Signal again. Then Id like to use LME 49990 with the BUF 634 to drive long cables. Mabe it is possible to drive the two BUF directly?
My experience with the buf teached me that the BUF's are not easy to control ner unitiy gain, so i'd like to be on the save.
What do you think about the schematics?
My Goal is a "simple" active Volume controll with very high part quality and a negable difference between right and left channel.
A few Day's ago, i found those Volume Attentuator:
High Quality Audio & Industrial Attenuators
Now i started to think about the schematics. The Opamps in the front are not choosen out till now.
My idea was a operational amplifier for a high input inpedance and with some trimmers to get a CMRR>60db. The DC servo is to handle a DC offset of +-100mV (but i need to calculate it again). Do you think it is possible to get a high CMRR with DC Servo in one stage?
The Output stage uses a 1632 to get a symmetrical Signal again. Then Id like to use LME 49990 with the BUF 634 to drive long cables. Mabe it is possible to drive the two BUF directly?
My experience with the buf teached me that the BUF's are not easy to control ner unitiy gain, so i'd like to be on the save.
What do you think about the schematics?
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There is a "mistake" in my shematics.
The 1632 is builded for an AD converter. It is possible to get a "near symetrical signal" out of a Single ended input.
Depending on my measurements today, it was 20% off
My idea is now to buy a finished Balanced SE konverter and then a SE Balanced Converter from Funk Audio Berlin.
The 1632 is builded for an AD converter. It is possible to get a "near symetrical signal" out of a Single ended input.
Depending on my measurements today, it was 20% off
My idea is now to buy a finished Balanced SE konverter and then a SE Balanced Converter from Funk Audio Berlin.
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