[sdiy] Help-Blacet midi-din sync chip problems!

David D shockadd at hotmail.com
Sat Feb 9 09:11:16 CET 2002





   So I got the midi to sync convertor chip from Blacet and have constructed 
the midi to 24ppqn circuit as described in figure three of the data 
sheet/schematics that Blacet has on their web site and sends out with the 
chip. Ive followed the normal conventions for creating such a circuit and 
have at least twelve years experience with such-
so I am not concerned about my ability but I just cannot seem to get that 
circuit to output a nice stable 24ppqn 1ms long pulse! If I sub
a 1meg resistor for the 100k that the schemo calls for it is pretty close to 
a 1ms pulse but it is still not very stable- it lags and rushes at a very 
high rate. The crystals I have tried are all brand new and good. The power 
supply I am using is a nice regulated stable
+5 volts at about 300ma. I have all the +5v connections for the chips
and the ground/common connections. All resistors are the value called for 
and are 1% tolerance. The caps are exact values and check good.

  Any help is greatly appreciated!!!  This is starting to make me a little 
crazy so please help!?!?

  Thanks

  DavidD

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