given that those things weren't even made in clean rooms, and there
are literal tutorials on semiconductor manufacturing at home on
youtube, i'm surprised no one has tried manufacturing tunnel diodes on
their own yet. so many smart people here, you'd think one of us has
some acid and all that other smelly stuff that's necessary :-)
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On Sat, Mar 6, 2021 at 8:03 PM Charles <charlesmorris800@...> wrote:
Yes, both those controls work. The real-time mode still looks weird although now there is only one dot showing during the fall... still should not be any. I'm not going to go chasing that any further since I won't be using a sampler in real-time mode anyway - my other scopes can handle that, and without the risk of blowing the head :)
I played with it a bit more today. First I I threw together a quick TD pulser clocked by a 1 MHz crystal oscillator, and calibrated the sweep on the 0.1 us range using the square wave, then examined the edges after the TD. The waveform is ugly after the ~1 ns edge, but I know lead length and placement are at issue). With pulse inputs I can't go faster on the 3T77A than 20 ns/div equivalent (and using the X10 expander mode i.e. 2 ns/div) because it takes too long for the scope to trigger and display. There's no delay line in the 3S2 and I didn't want to rig one up for now.
Also hooked up my GR 220-920 MHz oscillator to both heads (the S-2 and S-4). It displays sine waves nicely up to about 500 MHz. At 620 MHz the trigger is starting to lose function so the traces get noisy, a bit better with the Smooth switch on, but at 800 MHz it's useless.
Photos in the Sampling with 3S2 album.
