Timeline for 555 astable - frequency not linear with discharge resistor for smaller resistor values
Current License: CC BY-SA 3.0
7 events
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| Apr 10, 2018 at 16:26 | comment | added | Wouter | I was thinking in line of the MOSFET drivers already, but in the end the buffer does the job. Thanks for the suggestions. | |
| Apr 10, 2018 at 15:15 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
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| Apr 10, 2018 at 13:57 | comment | added | Wouter | Resistor can't be increased in value: that's the very parameter I'm trying to measure through the output frequency. | |
| Apr 10, 2018 at 13:56 | comment | added | Wouter | Based on a voltage of 2/3 Vcc = 2.2V, and the rated current delivery of 24 mA, my charge resistance should be able to go down to 46Ω with the two combined. Yet I see serious non-linearity at 10x that already. Some further analyses showed an internal resistance of about 20Ω, which sounds quite reasonable. I couldn't find any hard numbers in the data sheet, just absolute maximum source/sink ratings of 100 mA. | |
| Apr 10, 2018 at 11:28 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
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| Apr 10, 2018 at 10:38 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
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| Apr 10, 2018 at 10:30 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 3.0 |