[sdiy] (no subject)

[Jason Proctor]

i built the blacet midi sync design and trust me 
you don't want to use the divider section. the 
4520 chip is 100% the wrong one to use if you 
actually want your divided pulses in anything 
like musically useful timing.

after numerous nonworking experiments i 
eventually sent the raw 24ppqn output from the 
4538 to a mildly hacked cgs36 divider board for 
further divisions. the cgs board also adds the 
necessary output buffering which is missing from 
the blacet design.

the 4017 is very handy for regular division 
stuff. the 4024 is all right too, but it's a 
ripple and that makes me a bit nervous.



>I had hoped to get the PCB from Ken for the 
>master divider, but he is out of them ?.  I just 
>looked at the schematics again, and I know it's 
>simple, but it still scares me to try building 
>it w/out the PCB!  Im sure it would be good for 
>me to give it a shot, though.
>
>Last night I was working with the schematic from 
>Blacet's MIDI/Clock IC datasheet.  I skipped the 
>MIDI part, and just tried building the little 
>circuit around the 4520 and 4081.  I wasn't 
>exactly sure what to do with the "RST" which on 
>his schematics go back to the MIDI IC.  I tried 
>connecting it to ground, and to positive, and it 
>made no difference.
>There is NOTHING to the circuit, so Im not sure 
>why it didn't work.  I don't remember where I 
>got the IC's but if I got them from the local 
>electronics store, that could be the problem, 
>because 1Ž2 of anything I buy there is faulty.