- Measuring audio amp output power - 1 Update
- Diode On Small dc Toy Motor: Why ? - 2 Updates
| whit3rd <whit3rd@gmail.com>: Aug 04 09:15PM -0700 On Friday, July 31, 2015 at 8:42:40 AM UTC-7, MJC wrote: > If only superconductors for liquid N2 temperatures (77K, -196C) were so > common! Even at liquid He (4.22K, -270C) only a minority of metals make > the transition. Superconducting transition is not the only misbehavior; carbon resistors have a semimetal/semiconductor transition, and turn high-resistance when cold, and metal-film resistors move VERY far from their nominal values when cold. Platinum film RTDs work because they have resistance accurately proportional to absolute temperature: resistance at 77k is about a quarter of that at room temperature. |
| mroberds@att.net: Aug 04 07:31PM > Anyone have any thoughts perhaps as to for what purpose the diode > was included ? Depending on exactly what kind of diode it is, it will drop around 0.3 to 1.1 V or so. Without the diode, and with fresh batteries, maybe the motor ran too fast for the application. Matt Roberds |
| jurb6006@gmail.com: Aug 04 01:48PM -0700 Most likely because the mechanism would bee damaged or desrtroted by revers rotation. |
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