[sdiy] Update ... and a warning

[Ingo Debus]

Tim Ressel wrote:
> 60MHZ Tek 2213 analog scope. The pulses are 500nS
> wide. I have Agilent 10074C probes. Ihave had this
> problem with scopes before. Also this scope isn't in
> the best shape.

Strange. My old 20MHz Hameg catches 500ns pulses easily. Perhaps I 
have to tweak the trigger level pot a little, but that's all.

Ingo