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  1. CDRIVE

    Loading a blinker relay.

    Ha, too funny! That's exactly what I saw but I shouldn't have missed that 60 Ohms is 10 times outside the ball park though.;)
  2. CDRIVE

    Tip For Which DataSheet.PDF To Choose

    Yeah Steve, I've found that to be true also. So, I too have multiples of a single device and like you said, you're unlikely to find a non scanned data sheet for a 6C4. :D
  3. CDRIVE

    Loading a blinker relay.

    Sorry about that. I could have sworn I saw you post 60 Ohms in an earlier post. I should have caught that though, as 60 Ohms would certainly not draw the current you want. Though, there were values close to what you want on ebay. BTW, compactness and heat dissipation will make for a contentious...
  4. CDRIVE

    Application of 7805

    That makes no sense. What are you trying to design?
  5. CDRIVE

    MOSFET IRF540A circuit.

    Justin, please run the test again using the same circuit with one exception. Don't ground the Input - (Black). Just leave it disconnected because it's the same electrical point as green. Thanks. Chris...
  6. CDRIVE

    Tip For Which DataSheet.PDF To Choose

    All the major Data Sheet sites will usually offer you quite a few data sheets, offered by various manufacturers, for the same device. For instance, you may see a listing from National with a file size of 65KB and another from GenericNameElectronics, with a file size of 386 KB. At first glance...
  7. CDRIVE

    Correct way of converting 12v down to 3.3 for a pin input?

    Personally, I think he should scrap the whole direct connection approach and use something like this. It would be a heck of a lot safer. I read some of the FAQs on the Raspberry Pi that says it's powered by a wallwart or 4 dry cells..6V. While I think that 2.79V is more than satisfactory to...
  8. CDRIVE

    WD40 ok as switch cleaner

    Since there seems to be disagreement among the troops I thought I'd put in my 2 cents. WD40 will certainly work on low voltage/current switch contacts and Pots in the short run but in the long term it's very, very bad. WD40 contains silcone. Over time, especially if not used, a pot could freeze...
  9. CDRIVE

    Correct way of converting 12v down to 3.3 for a pin input?

    Why is R1 so high? R1=1K, R2= 100K would seem more logical to induce zener action. R2, in this case, is not used as a voltage divider. It's only purpose is to keep the uC's input pin from floating when no signal is present. Heavily shunting the Zener with R2 just makes it harder for the Zener to...
  10. CDRIVE

    Flasher circuit negative switching

    You seem to have disappeared while I've been waiting for definitive answer to the values of those resistors. Those resistors are used in conjunction with an ADC input on your control unit but I don't see how the circuit could function with values like that, Attached is a circuit intended to...
  11. CDRIVE

    LDR circuit ( Application of transistor as switch)

    Shades of the "Erector Set" that I loved as a child. ;)
  12. CDRIVE

    I need help assembling a list of components off of youtube

    As useless and awful waste of energy as I might think that is, why don't you ask the author?
  13. CDRIVE

    Loading a blinker relay.

    Check this out. Parallel two of them and you'll have 60 Ohms @ 500 Watts! http://www.ebay.com/itm/Dale-RH-250-250W-120OHM-5-Power-Resistor-/350562565552?pt=LH_DefaultDomain_0&hash=item519f283db0
  14. CDRIVE

    Loading a blinker relay.

    Yes, CC explained all of that and I commented that it's wasteful. However, if you insist on not using an incandescent bulb as a dummy load then use a heat sinked power resistor. They're made with a heavy anodized aluminum jacket with heat fins. They have two mounting tabs to screw it to a...
  15. CDRIVE

    Application of 7805

    In the event that you're trying to obtain 5V regulated at a current higher than the 7805's 1 Amp limit. This might be what you're looking for. If not, nothing lost.
  16. CDRIVE

    LDR circuit ( Application of transistor as switch)

    I don't want to hijack this this thread but I must relate this memory. It was July in 1963. The place was S Company of the 2nd Training Regiment at Ft. Dix New Jersey. We were all gathered in the woods where an elevated deck was built for the DI's to be seen and heard easily. We were in our...
  17. CDRIVE

    how to reduce noise.

    What an odd title you chose. In our world "How to reduce noise" has totally different connotations. As previously stated..post a schematic.
  18. CDRIVE

    LDR circuit ( Application of transistor as switch)

    I think I love this idea. The visuals would be great. ;)
  19. CDRIVE

    LDR circuit ( Application of transistor as switch)

    Ammeter is a generic term. It doesn't specify the range you're measuring. Besides a 0 to 50uA meter movement can be shunted to measure.... 0 to 500uA 0 to 5mA 0 to 50ma 0 to 500mA 0 to 5A 0 to 50A 0 to 500A Likewise, it can be multiplied to measure ... 0 to 500mV 0 to 5V 0 to...
  20. CDRIVE

    LDR circuit ( Application of transistor as switch)

    Regarding this question sent via PM.. Earlier in this thread a member, I think it was CocaCola, mentioned that he prefers permanent analog meters for teaching aids. I totally agree with him or whoever posted that. In fact, as a teaching aid, I think this project should incorporate two meters...
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