OPTICAL WIRELESS

I NEED THESE ICS
TLC555, MF6-50.
ANY IDEA.
MF6-50 IS OBSOLETE
HOW CAN I GET THAT
ANY SUBSTITUTE?
:roll:

The 555 timer is available from most any supplier. The MF6 is a switched capacitor, 6th order, Butterworth filter. National also makes an LMf100 dual filter or Texas Instruments makes the MF4A 4th order filter.