Activity for Dave Tweedâ€
| 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) |
— | over 2 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. (more) |
— | almost 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. (more) |
— | almost 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) |
— | almost 3 years ago |
| Comment | Post #276885 |
See edit above. (more) |
— | almost 4 years ago |
| Edit | Post #276885 |
Post edited: add second section |
— | almost 4 years ago |
| Edit | Post #276885 | Initial revision | — | almost 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) |
— | almost 4 years ago |