[sdiy] TB303 Slide

[colin f]

> Note in there he suggests the gate on/off times are not 
> 50:50, but 3.5:2.5 (out of 6!) - however this 'scope shot':
> 
> http://ultra303.ultrafex.de/twonotesslide.jpg
> 
> seems to contradict that, showing it to be 50:50.

It's 50:50 on my scope too.
Robin's info is not entirely accurate.

> That the slide line also triggers the latch for the DAC is 
> obvious from the schemo, but this post  apparently measures 
> the pulse at only 50us wide:

I measured it at 40us, IIRC.
I generate the non-slide pulse with that length in the MIDIBass 303
interface.
You need to make the pulse quite a bit longer before you can hear any 'slide
on every note' effect.

> I have also no idea whether there are any sorts of latencies 
> of all the edge changes etc. as they  pass through the chips 
> concerned.

Nope. It's all pretty straight forward.
No voodoo involved.
If you copy the original circuit, and use the same timings, it will sound
the same.

Cheers,
Colin f