TR-606 Trig Outs

[danial stocks]

>
>Was wondering if anyone could help me with something im trying to do for 
>the
>TR-606.  I want to add Trigger outputs for the AC,BD,SD,CY, and HH's.  Im
>hopeing someone on this list may be able to direct me a bit in the methods
>of doing so i.e. where to focus and where to interject within the circuit.
>I know analogue solutions has the kit, but id rather not order it if i dont
>have to.

Use a 74LS244 for trig o/p buffering... [you will probably have to use the 
surface mount type. also use 220 ohm res on the o/p's on the buffers so the 
chip doesn't blow up if you accidentally short the trig o/ps.. suggest using 
a separate 78L05 reg to supply power for this - the internal inverter in the 
606 is tiny, and they can blow up.. if the little transformer breaks, you 
are in BIG trouble as they aren't available as a spare anymore as far as I 
am aware..

if you have the cct diagram of the 606, you will see that the processor has 
an o/p line for each sound, and also a common trig o/p. these combine in the 
cct to produce a syncronized 10ms trig pulse [without going finding the 
diags I think this is done by means of transistors and isn't a nice logic 
lvl ]  = you will need to and them with a 74HC08 and gate or something - or 
you could use the trig pulse o/p to activate the tristate enable on the 
ls244 [but will need an inverter as ls244 is active low enable]

if you need more info I'll dig up the cct and try to give you exact pin nos 
etc - no way to scan in the whole diag unfortunately..

Cheers,
Dan
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