Yep. Here are the news.
For now, I got 2 working "bands".
First, VSF-based, which can be LPF, BPF, HPF; cut up to -35, boost up to 14 db;
HP/LP can be from 4db/oct till resonant 22 db/oct; like a plugin, but analog.
Second - Sontec low band. 18...800 Hz, LP/BP.
8 steps of Q; 31 steps of gain (and "band off"); 28 frequency's.
Have to test the rest of Sontec bands; than Neteq/ISA110. Maybe, will do filter of SSL channel EQ.
This final EQ will be done at universal motherboard which can handle 2 channels, up to 7 filters each one,
"summing" boards, input/output boards, and MS/level board delivered from K-1.
Trying to keep it flexible as possible but not overcomplicate.
The idea is to combine different EQ's as well.
Say, Sontec and Neteq are "parallel" design but different filters types, different gain control;
however, one glance at both schematics and we see, there are many common things!
I want to keep everything in 2RU. User interface will be simple:
not like Bettermaker (I cannot understand what goes here, besides I sure it is good), but like Max BCL.
All parameters can be seen at same time.
Each band has its GAIN, FREQ, Q control, displayed on corresponding 7-seg. LED display.
2 EQ channels can be linked or separated.
This way, up to 7 bands, level/MS (optional), memory's.
CUT filters (LPF/HPF) can fit at one band's slot.
Audio wise, there are lot of benefits of use of relays over "traditional" ELMA's.
More steps and total recall; hermetically sealed contacts; no wires fron audio to front panel
(relays can be placed as close as possible to filter they control).
For 2 bands of stereo EQ, the mathematics are next:
32 relays plus microcontroller, LED displays and other stuff aprox. $90
2 dual, 2 single ELMA's and something less fancy for Q control: about EUR160.
Complicity - yes, control board with uP/displays/rotary encoder added, but soldering resistors/relays bit less work than in case with ELMA's.
Well...stay tuned. Will upload some new photos soon as I got the camera to workshop.
