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Digital volume/tone control in Tube amps
Digital volume/tone control in Tube amps
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Old 20th December 2007, 07:46 PM   #11
tubeeater is offline tubeeater  Austria
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Now I ordered two of these AD5290, I will give them a chance....
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Old 20th December 2007, 07:54 PM   #12
kevinkr is offline kevinkr  United States
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Digital volume/tone control in Tube amps
Quote:
Originally posted by tubeeater


Thanx, I have to try this.....
My doubts are that the AD5290 won't survive the poweron, since at this moment the caps that filter the HV are not charged and the whole HV hits the chip, but I will do some simulations.... I will post when done.

<snip>..
Use diode clamps on the inputs as I previously mentioned.
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Old 20th December 2007, 07:54 PM   #13
Wavebourn is offline Wavebourn  United States
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Digital volume/tone control in Tube amps
8 FETs and 8 resistors for one 8 bit variable resistor - what may be simpler? You may add 8 D-triggers to lock up the state.
Also, it does not harm the sound unlike ICs with active VCAs.
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Old 21st December 2007, 12:08 PM   #14
tubeeater is offline tubeeater  Austria
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Quote:
Originally posted by Wavebourn
8 FETs and 8 resistors for one 8 bit variable resistor - what may be simpler? You may add 8 D-triggers to lock up the state.
Also, it does not harm the sound unlike ICs with active VCAs.
Thanks, I will try that also.... I just have to get the parts
I will try both the chip and the FET / resistor version and compare it...

By the way: my simulations show that I have some signal level of +- 40V something... I will have to stack 3 of the chips but it seems to be possible tough...
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