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  1. CDRIVE

    Flashing 5watt led?

    OK, listen up, so I don't have to repeat this information. You said that this is getting expensive but you weren't specific about what. The Q1 MOSFET is less than a dollar at Digikey. You need this FET (Field Effect Transistor) because these LEDs exceed the current limitations of the 555. The...
  2. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    Was this a salesman you talked to? It's refreshing to know that he imparted such exacting data. :rolleyes: That said it's probably less than one nitnoi per deg C or 1.2 minuscules per deg C. :D Chris
  3. CDRIVE

    Flashing 5watt led?

    I've been wondering why I'm virtually alone in this topic. Are you guys enjoying this dialog? I think I'm approaching thermal runaway! :rolleyes: Chris
  4. CDRIVE

    Flashing 5watt led?

    Yeah, I do! I think it could handle the brief load but Vce(Sat) would be too high. Chris
  5. CDRIVE

    Flashing 5watt led?

    No, at 350mA you'll still need a driver transistor. Besides, this LED is only 50mA less than your last pick. Anyone see any reason that he couldn't use a cheap 2N2222? Check my last schematic that I posted. His duty cycle will be 50mS or less and the freq is only 1.6Hz. Chris
  6. CDRIVE

    Door Latch opener switch

    Unless this solenoid is unlatching a dollhouse door I don't see battery operation practical. To power a typical (human size) door latch for a reasonable period of time, without recharging or battery replacement, would require D cells or rechargeable Nicad, Lith-Ion, etc packs. Chris
  7. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    Guys, I searched Kevin's Nuts & Volts article and found the PDF. The preface alone is an enjoyable read. We have quite a few requests for water level circuits, so I found the list of air/water properties (alone) to be worth the read and dendrite stimulating to boot...
  8. CDRIVE

    Door Latch opener switch

    If you're referring to what's commonly known as a '9V Transistor Radio Battery' then absolutely and unequivocally NO! Chris
  9. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    Does this Cap Meter have a computer interface? Chris
  10. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    Geeeeez, I hit submit and there you both were. Now I feel like an echo! :p
  11. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    First comment on the list is all coax are not created equal. There is a vast selection available with varying types of dielectric, conductors, shielding and sheathing. The price per foot is just as great. So, it's doubtful that they all would have the same C vs Temp curve. In lieu of not...
  12. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    Is this a long period temp test of the capacitive device: as in a lab (temperature stress) chamber? Chris
  13. CDRIVE

    Coaxial Cable Capacitance Change Due to Temperature

    I would think that this data would be found in the manufacturer's data sheet. Are you using the coax unterminated as a capacitive element? I believe a coax line is represented as lumped C, L and R - (including dielectric loss) per foot @ 25 deg C. Chris
  14. CDRIVE

    Door Latch opener switch

    Please describe the latch or, better yet, post a photo of it. Chris
  15. CDRIVE

    Flashing 5watt led?

    Yes Steve, the human eye persistence will register that. Once he breadboards this thing he can play with the timing to his heart's content. By the way, since I got my new bike my rides have been getting longer. 25 miles doesn't seem like a big deal anymore. I've racked up over 500 miles since...
  16. CDRIVE

    Flashing 5watt led?

    http://en.wikipedia.org/wiki/Diode Chris
  17. CDRIVE

    Flashing 5watt led?

    First rule when referring to a schematic: Always refer to the component name, IE, R1, C1, D7, U4, etc. Second rule: Never draw and post schematic without naming the components. When reading a schematic the component name is first followed by a space and the value. Q1 is the LED driver...
  18. CDRIVE

    Flashing 5watt led?

    No because you need a complete electronics theory course. On the other hand you can post theory questions per component in https://www.electronicspoint.com/electronics-homework-help-f106.html For example "What is a MOSFET Transistor and how does it work"? Judging by your posts you need help...
  19. CDRIVE

    Flashing 5watt led?

    All components above were taken from your original circuit that you posted in another topic here. https://www.electronicspoint.com/cant-understand-got-right-t255707p3.html That circuit uses only one LED though. The values R1, R2 & C1 determine the frequency. R1 & R2 also set the duty...
  20. CDRIVE

    Flashing 5watt led?

    As I recall the LED you picked is a 1A LED. From an electronics design standpoint I'm concerned only with this figure. Chris
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