See the circuit diagram
You can find, the signal only through a resistance, then it can infection the sound very little,
But in the R2R, the signal will through more resistance in most times, so the sound will be fall.
I'm a audio production made to order man . and all my production is my design.
You can find, the signal only through a resistance, then it can infection the sound very little,
But in the R2R, the signal will through more resistance in most times, so the sound will be fall.
I'm a audio production made to order man . and all my production is my design.
Is that price complete – with parts & built?
Maybe better to email me offline: rick57@optusnet.com.au
Thanks
Richard
Maybe better to email me offline: rick57@optusnet.com.au
Thanks
Richard
This is 12 position? My commercial experience is that many more positions are needed. My Eidetic GB1a preamp of 1989 used a 12 position resistive ladder and in the marketplace it pleased no-one despite all my tweaks for stepping. I updated to the commercially far more acceptable Alps 43 click pot with added shielding.
Hi Hugh,
From memory (1990), I managed to track down an alps agent in Australia. They had to be specified by a code that would do an eye chart justice - and I waited a few weeks for the production and delivery. They were 50K but had some crosstalk which improoved dramatically when I wrapped them in a (rubbing) copper box and earthed it. Using a 10K would lower crosstalk by 14 dB.
They may be more available from Taiwan, HK, or Singapore as an off the shelf these days.
Trust that helps. I could do with one.
From memory (1990), I managed to track down an alps agent in Australia. They had to be specified by a code that would do an eye chart justice - and I waited a few weeks for the production and delivery. They were 50K but had some crosstalk which improoved dramatically when I wrapped them in a (rubbing) copper box and earthed it. Using a 10K would lower crosstalk by 14 dB.
They may be more available from Taiwan, HK, or Singapore as an off the shelf these days.
Trust that helps. I could do with one.
I dont want to rain on your parade but i would like to mention a few dissadvantages with your design. Depending on your volume setting your input impedance is different this means a different noise figure and a different bandwidth (which again means different noise figure).
Sorry but i just noticed your image. Iam not a big fan of having the volume control ONLY on the output (or in the middle). While having the volume control not on the input increases the noise performance it degrades the distortion. Your input stages are going to be swinging large voltages compared to a circuit with a volume control on the input. I guess its one trade off for another, designer's preference
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