I can't wait for free_electron to have more kits!!!!!
free_electron Please add me to the list too.Speaking of w2eaw's videos, I followed this one:
to build a Schmitt trigger pulse generator like his example. I wanted to use his pulse generator do do a sanity check of my 150 MHz Tek 2445A scope's bandwidth.
I used a BNC connector soldered to the board that directly connected the pulse generator to channel 1 input (no probe used). I measured a rise time of about 4.4 nS on the 2445A. The 74AC14 datasheet gives a propagation delay of 1.5nS minimum to 10 nS maximum and typical delay of 7 nS. So, the rise time of the scope should equal the measured rise time minus the propagation delay of the pulse generator (right?). Using an estimated delay of, say, 2 nS for the pulse generator itself, that would give a scope rise time of 4.4 - 2.0 = 2.4 nS, or a bandwidth of about 145 MHz, which confirms the sanity check, assuming I am doing this right, i.e., making no invalid assumptions.
Of course, this pulse generator is only useful for bandwidth measurement on scopes where the circuit's delay is small compared to the rise time of the scope. I would really like to use the JW pulse generator when the kit is available again to get a more accurate measurement.
--Van