gres
Full Member level 4
It's a classic 7 channels analyzer of acoustic spectrum, but one thing makes it come out from the crowd.
At the time of miniaturization and SMD elements i choose another way and wanted to make as big as it's possible analyzer.
I think I reach the target, because device is made up of 7 columns ( size 40/40.750mm), and each column has 12 flash points with diameter 35mm each.
Assumptions:
- simple construction, but great effective of system
- low cost, but great aesthetic
- module construction and different configuration of modules.
… all assumptions are done.
One column in maximum configuration has :
- preamplifier board of electret microphone
- board of band filter
- display boards
Easiest way to make indicator of controllable level line signal is steering board and 2 or 3 display boards. As I sad assumption was easiest, that’s why I didn’t each display boards, there’s no need for that because it’s just 6 series paths.
Casing is cable channer PCV 40/40, white apertures that has function of flash points are just plastic plate’s cut to right dimensions.
I advise against putting 100nF condensers at outputs of filter modules, they only understated frequency response especially in the lowest registers.
Original text and more information like pictures in rar format you can find here : https://www.elektroda.pl/rtvforum/topic1471378.html