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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Re: Sweetest Whispers Questions posted by dbishopbliss on January 5, 2006 at 08:52:49:
At "3 clicks" the incoming signal will pass through the input series resistor (33K typically) and then seven resistors, for a total of eight resistors in series. The lower the volume setting, the larger the number of resistors that the signal will pass through. At the lowest audible setting (1 click) the signal passes through a total of ten resistors to arrive at the VA grid. At Maximum volume (Position 11) the signal passes through only the 33K resistor. Yes, it does still travel through all the other resistors in series to ground, as well, but this isn't considered as being "in the signal path".This approach is different than in the "stock" FPII, in which the signal input connects to the high side of the 100K potentiometer, the wiper / slider connects to the VA grid, and then the low side of the pot to ground. THis method, the input resistance is always 100K, and the resistance from grid to ground can vary from zero to 100K ohms.
In one of the Ladder Attenuators. like the Goldpoint, etc, the signal only ever sees two resistors, at any of the 23 positions. One resistor connects (through the 23 position switches) to the VA grid, the other resistor connects then to ground. In order to do this, the stepped attenuator reauires 46 resistors and 3 or 4 pole, 23 position switch (the lower cost Taiwan / Hong Kong stepped attenuators may use only a 2 pole, 23 position switch). The SW uses a 1 pole, 11 position switch and ten resistors in series (plus the input series 33K resistor).
The 12th (or 24th) position is used as a physical "stop".
In terms of voltage, 3 dB equates to a 1.41:1 ratio, 6 dB is a 2:1 ratio, 10 dB is a 3.16:1 ratio and 20dB is a 10:1 ratio. In terms of power (wattage) these numbers are squared (eg, 20 dB power gain equates to 100:1 incerase).
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Follow Ups
- Re: Sweetest Whispers Questions - Dyna Saur 10:14:38 01/05/06 (2)
- Now I'm really confused... - dbishopbliss 13:10:07 01/05/06 (0)
- Re: Sweetest Whispers - JB 11:32:16 01/05/06 (0)
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