Posted On: 27/03/2011
By: Rodney Pettipher
A: One has a Euro 2 pin PSu the other a UK PSU.
If you need to use in the UK and Europe order the VRC and a KT5E.
Posted On: 10/01/2011
By: Tony Greenwood
A: We can only offer a UK or European mains supply.
Posted On: 07/07/2010
By: Dan Nordin
A: The VRC is based around a Dallas 1802 audio grade potentiometer ic
This has a THD of about 0.002% and a noise figure of -90dB
We buffer the output with a TL074 which has similar specification.
The attenuation is 64 steps of 1 dB per step. This gives a maximum
attenuation of 64dB.
It is based on the reference circuit for the ic that Dallas produced,
but we have found an error in this circuit. The input is fed into a
bridge to make sure that both ends of the resistor ladder are at the
same potential. This works well but does mean that the low end of the
resistor ladder is off ground by about 1K. This results in attenuation
that is not as high as it should be. (lowest volume setting does not
achieve - 64dB)
We can do a mod that bypasses the resistor for AC signals but it does
produce a slightly worse S/N ratio.