Thread: Hints and Tips
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amdx amdx is offline
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Default Hints and Tips

Hi all,
I'd like to see a thread on hints and tips you have picked up or devised
while developing circuits.
I'll give you one to start;
While involved in the development of a couple of class E amplifier products
the collector voltages peaked at over 600 volts The scope was only capable
of
displaying 400 volts. I put an attenuator together that made the probe a X20
probe,
while still keeping the HF response.
Parts used;
BNC T
BNC to F connector adapter
F connector
920k Resistor
100 pf capacitor
Heat shrink
Brass shim stock to make a cover
I'm sure other parts could be used, these are what I had available.
See the attached drawing for more details.
The resistor and capacitor values may need some adjustment for you probe.
I used the internal calibrator and adjusted R and C values until I had a
sharp
square wave and the proper voltage reading
I made a shield from brass that corrected some ringing (ISTR).
I do recall the shield was important.
Be sure to insulated the lead that passes through the F connector.

Yes, I know the probe cable has a limit to the voltage before it arcs.
Yes, the internal probe components have disipation limits.
I never found these limits to be a problem.

Let's see some more Hints and Tips.
Mike




Attached Thumbnails
Hints and Tips-x20-scope-probe-adapter-jpg-jpg