Monday, December 27, 2010
BoZoaC (BoZ on a Cap) uses a recursive component-2-component construction method to build the whole of the preamp cct. on the output caps. See the posted images below of the BoZoaC engine.
In my system input caps are not required and an earlier BoZSE build (input capless) proved that removing these caps improved overall performance of the preamp. Anytime signal path can be reduced in length and component-2-component construction methods used, sound quality has to improve. If look at the BoZoaC engine below it is obvious the signal path on the cct. is reduced to component length.
Some very high-end preamp manufactures will not use metal cases to enclose the boutique components claiming magnetic and eddy current issues. I chose this plastic case for similar reasons and wanted a non-resonant slim case to enclose this unusual build.
Though only a few hours of play have pasted through this tiny little preamp cct. I am convinced the sound equals or betters that of BoZSE which is supported by 30,000uf of storage caps. There appears to be a greater immediacy of the music with equivalent bottom end. Only comparative listening will prove this but this whole build is very satisfying so far.
A ridged plaster instrument case was chosen to house the recursively constructed BoZoaC. Three 9V lithium batteries sit at the rear where two sets of gold plated RCAs are mounted. The output for the preamp can be found on the left of the case with the input selection switch.
On the right rear of the case the banana style low profile sockets are mount to allow battery checking. If the batteries are removed an external PS could power BozoaC. Silver solder and wirewrap wire are used throughout.
Friday, December 24, 2010
Due to the low component count of the BoZ cct. it is quite possible to build the whole preamp on a the output caps. In my other BoZ constructs I employ 20,000uf of storage caps. To keep the whole build very compact I used 2 x 1000uf low ESR caps for storage caps.
There is no input caps or attenuator with this build. It is not required in my system but other systems may require those components. A big plus of a genuine component-2-component build is a very short signal path and a minimum number of solder joints. These two factors help to improve the over performance of the preamp. There is no additional wire used in the build, all components are directly silver soldered to each other components.