Doepfer

	-----Original Message-----
	From: Tim Stinchcombe
[mailto:timothy@tstinchcombe.freeserve.co.uk] 
	Sent: 30 May 2003 19:52
	To: Doepfer_a100@yahoogroups.com
	Subject: [Doepfer_a100] Modified my A-117 Digital Noise
Generator
	
	
	Hi list,
	      Having despaired last night at not being able to clock my
A-
	117 digital noise module with my A-111, this morning I took
penknife 
	and soldering iron to it. I have 'reconfigured' it, moving one
of the 
	Schmitt triggers from being after the internal clock but before
the 
	input, to _after_ the input. It now 'squares up' the incoming
clock 
	signal immediately before passing it to the shift register
generating 
	the noise. The upshot of this is is now I can clock it with just

	about any oscillator: whatever it was about my A-111 output it
didn't 
	like before (even the square wave output), it will now happily
run 
	from any of the outputs; previously if I tried it with an A-110
it 
	would invariably settle into a weird, (non-noisy) steady
oscillation 
	state - now it runs noise-like as I want it to. In fact it will
run 
	from any attenuated sine wave as long as it is greater than
about +/-
	1V in amplitude.
	
	The modification requires cutting 4 tracks and adding 4 straps
(and 
	is moderately fiddly). If anyone else has been experiencing this

	frustration, and wants to know the details, let me know and I
shall 
	write some instructions and post them (and if I can persuade my
mate 
	with the digital camera to visit and take a few snaps of it,
post a 
	few pictures too).
	
	Cheers,
	      Tim
	
	
	
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