5 band EQ in a chip?BA3812L from ROHM

[Aharon]

ROHM manufactures this chip BA3812L,the frequencies are controlled by external caps so we can taylor it for guitar.
http://www.electronic-circuits-diagrams.com/audioimages/12.gif
Aharon

[R.G.]

Check out GEO, 10/13/99, http://geofex.com/Article_Folders/EQs/greqs.gif for two versions of a seven band EQ - or a five band if you ignore two of them.

The KA2223 is a variant of the ROHM chip, with opamps on board and some transistor based gyrators to make a classical cut/boost graphic from a pot and a series RLC circuit on each pot.

Oddly, the two-opamp version I did was as easy to get into the same sized PCB as the special purpose EQ chip it did the same job as.

[Aharon]

Thanks RG.Interesting how it takes the same board space with and without the integrated chip.
If the ROHM chip is inexpensive it might still be worth the effort.
I wonder if somebody got 2 or 3 of these chips ,for example the PT 2399,the compressor chip we had kicking around a while back and the ROHM EQ and make a diy multieffects of sorts.
Aharon

[MetalGuy]

Although somewhat difficult to find check out also LA3600 /5 band/, LA3605 /7 band/, M5289P /7 band/ .