Beresford Bushmaster DAC

[Colin151]

Those were the days. I remember them well .

I intended to put a simple variable volume control on the Bushmaster, but I soon realized that a simple volume control circuit was out of the question. So that is still under development. Even fitting a volume control to the headphone circuit was not an easy job. The main reason is the DC offset of 1mV. Variable resistors don't like DC. So I am having to use a volume control method that reduces the volume towards infinity, instead of shorting out the signal towards ground. Part of the reason that I use such an arrangement as well is that the headphone output dynamic range is not affected by low volume control settings. This is not always the case with most headphone designs, which then makes the sound so lifeless on lower volume settings in many headamps. I would of course like to use the same principle on the variable output.

Cheers for the exaplanation Stan. I kind of understand a little but not fully! My electronics knowledge is not that good! My speciality is to just isten and play with different kit (and do the odd bit of modding if I know pretty much exactly what to do!)

Sounds like you worked very hard to get the headphone section of the Bushmaster with variable volume to work well. I am sure you'll be able to do it with the variable out too. I (for one) would buy that add on as soon as it came as, as I'm sure would many others would on this forum and elsewhere. Remote control with the volume add on would be icing on the cake and also very welcome.