Signal generator for ecm bench

[Ludis Langens]

Ken Kelly wrote:
> 
> The one
> sneaky thing is that the VSS signal into the PCM is a
> differential signal. I used a small audio transformer to
> isolate the 555, and create a differential signal.

You can also use a capacitor in series feeding the VSS "Hi" input.  The
value seems totally non-critical.  I've tried both tiny ceramic disk and
big electrolytic capacitors with equal success.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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