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Activity for Dave Tweed‭

Type On... Excerpt Status Date
Comment Post #283587 I think the beta values are different just to make sure the simulation starts up. They have no real-world significance.
(more)
about 3 years ago
Comment Post #282593 Your switch is probably not what the OP intended. As you have it, there can never be 2V across the capacitor -- more like 20 mV. I suspect that what you really want is a SPDT switch that connects the capacitor to either R2 or R1.
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over 3 years ago
Comment Post #282194 Note that this process will define a *family* of solutions. A *specific* solution will depend on the phase of the AC source at the moment the connection is made, as well as the initial state of charge of the capacitor.
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over 3 years ago
Comment Post #280589 Most microwave ovens most conveniently offer operating times that are multiples of 10 seconds (or 30 seconds or one minute). So a turntable speed of 6 RPM is nice, in the sense that if you stick a mug of coffee or tea in the oven for a 30 seconds to re-warm it, the handle is pointing at you again whe...
(more)
over 3 years ago
Comment Post #276885 See edit above.
(more)
over 4 years ago
Edit Post #276885 Post edited:
add second section
over 4 years ago
Edit Post #276885 Initial revision over 4 years ago
Answer A: Is it possible to use two zener diodes in series back to back to replace a diac?
No, two zener diodes are not equivalent to a DIAC. While they both have a specific breakdown voltage, the DIAC is a special 3-layer device that exhibits a negative resistance characteristic once it breaks down: DIAC characteristic curve In contrast, the two zener diodes simply stop conductin...
(more)
over 4 years ago