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sharpie7 / circuitjs1

Electronic Circuit Simulator in the Browser
GNU General Public License v2.0
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Greater range for Horizontal scale in scope properties #881

Open Kain6622 opened 11 months ago

Kain6622 commented 11 months ago

Would it be possible to add additional horizontal scale beyond 200us/div for high frequency circuits, currently can't view the frequency beyond ~10khz. Thanks

pfalstad commented 11 months ago

If you decrease the time step (Options->Other Options) you can decrease the scale.

Kain6622 commented 11 months ago

Thank you for your response, I tried as you asked and it worked up to about 40khz with time step size at 1n and horizontal scale of the scope set to 1us/div but if I try to increase the frequency past 40khz it glitches out in the scope (goes from showing a measurable frequency to as though I'm pumping 100MHz into it).

I fiddled around with the circuit (it's a variable 555 square wave generator) and have noticed that if I change the value of the variable resistor (lower the range) in the RC part of the circuit it allows me to see higher frequency to a point before the same glitch happens, it seems that the smaller I make the variables resistor range the high the scope can measure to a point before it glitches out. I've attached the circuit file for inspection. cleanercircuit (1).txt

pfalstad commented 11 months ago

I don't think it's a glitch. I think the frequency goes up exponentially as you adjust the potentiometer. I replaced it with two resistors so I could adjust the resistance more carefully, and it seems to become more and more sensitive to changes as you get close to 32.9k/17.1k.