Sync pulse to hex value

[Theo]

This is just a quick idea, there may be better solutions.
Basically you should be able to do the following:
Drive a counter from a separate clock (fixed) source (e.g.. 555).
Read the counter (=display value) when the 303 tempo pulse goes high.
Reset the counter after read. 
With the correct clock speed this should give you BPM readout.

BTW it will be easier and cheaper to use a small uC.

Hope this helps, Theo


----- Original Message ----- 
From: *Star Project <ampe at swipnet.se>
To: DIY skicka Lista <synth-diy at node12b53.a2000.nl>
Sent: Sunday, August 20, 2000 5:18 PM
Subject: Sync pulse to hex value


> Hey...
> 
> Modifying the TB-303 by adding a LED display that shows
> the current BPM value shuld not be to hard according
> to my theory. By Intercepting the tempo clock pulse
> that goes in to pin PA3 of the CPU and multiplying it with
> 1440 should according to my calculations give the exact
> BPM value.
> Ii this possibly correct or have I made som fatal misstake
> here? By the way is there anyway to achieve this without
> a preprogrammed chip? The output should be the BPM value
> in either hex or binary.
> 
> / Andreas
> 
> 
> By the way, Tony that site with the schematics for the CR8000
> I couldnt find any saticfying ones there.