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  1. CDRIVE

    Motor control diy

    Yes but it's very common to find them as Single Pole Double Throw (SPDT) micro switches that have 3 terminals. This way it can be used normally closed or normally open. ;) Chris
  2. CDRIVE

    555 timer reverse polarity circuit

    If you're referring to the whole circuit here .. https://www.electronicspoint.com/attachments/5214d1345076349-555-timer-reverse-polarity-circuit-555-1minhi1minlo-3.jpg you can just remove the shunt resistors across the LEDs. ;) Chris
  3. CDRIVE

    Bicycle Turn Signal Electronics needed.

    Kris, thanks for your observations. I've often wondered about it and now I feel like I'm not seeing things things that aren't there. I didn't know about the PCH 2955. That clinches it for me ;) Chris
  4. CDRIVE

    need help with latching relay circuit

    It latches itself. Edit: Btw, did you read the dimensions? It's very small and you don't need to install the header. •Dimensions: 0.4" x 0.9" x 0.125" (without header pins and pushbutton installed)
  5. CDRIVE

    Motor control diy

    It can be wired like this. S1A & B is your toggle switch. The mechanics of the limit switches will need some thought from you because you don't want them to re-close because of the traveler coasting past the trip point. I have some ideas on that and will try to draw it up. Chris Edit...
  6. CDRIVE

    low rpm, low torque, quiet dc motor???

    Good luck but I think he was a drive-by..
  7. CDRIVE

    Bicycle Turn Signal Electronics needed.

    The alternate FETs that Kris listed includes an NTD3055L and a RFD3055LE. Just curious... Does anyone know how they got their part numbers? I've often wondered if there was something about them that was akin to a 2N3055 BJT? Yes, there's probably no relation at all and this may be a lame...
  8. CDRIVE

    need help with latching relay circuit

    CocaCola, thanks for finding my post and saving me having to search for it. Chris
  9. CDRIVE

    Motor control diy

    I'm not saying that all target transits are like this but all the indoor ranges I've used had spring loaded (center off) momentary toggle switches like these. Drilling a mounting hole is a lot easier than cutting out large square or rectangular holes that have to be close fitting...
  10. CDRIVE

    need help with latching relay circuit

    One of our members (CocaCola) recently posted an off the shelf kit. It featured a single button, press ON press OFF and a high current FET switching element. You would need one board per circuit though but they're small and inexpensive. If I find the link I'll post it.
  11. CDRIVE

    Bicycle Turn Signal Electronics needed.

    Well, I've been decoupling it like forever and since my spice doesn't like unterminated pins ... ;) I did think the impedance was higher than it is though.
  12. CDRIVE

    Motor control diy

    We do a lot of leg work here but if you've already done it for us post the links.
  13. CDRIVE

    Bicycle Turn Signal Electronics needed.

    Nice Minimalism ! ;) Chris
  14. CDRIVE

    Bicycle Turn Signal Electronics needed.

    Kris, nice circuit. Probably just an oversight but leaving the CTL pin hanging isn't SOP. It's a HiZ input that could pick up noise. When not used a small cap to gnd is recommended on the data sheets. Chris
  15. CDRIVE

    Motor control diy

    Other than ceiling fan motors, fan motors are usually high speed. They're typically low torque too, especially stall torque!.
  16. CDRIVE

    Chronograph for bullets

    I'm more surprised than you but not because of spurious oscillation. That's not that uncommon. Constructing a working 153MHz Osc. is very difficult to do if your were trying too! I believe this more likely to be a measurement error. Chris
  17. CDRIVE

    Chronograph for bullets

    Earlier I mentioned using a low capacitance probe. Are you? Also,.. You said that touching the xtal can made the osc kick in so you grounded the xtal can. Crystal cans shouldn't need grounding. When you touched the can your entire body became part of the field. And your body isn't grounded. My...
  18. CDRIVE

    Problems substituting a relay

    OK, here's a solution that should satisfy both Peak and RMS values. Provide two text boxes. One labeled RMS, the other labeled Peak. Entering data in the RMS box will convert and display it in the Peak box and visa versa. Of course, the plots will remain peak values. Chris
  19. CDRIVE

    Problems substituting a relay

    Considering how programmatically easy it is to provide the user RMS data entry it's one heck of an oversight. . Chris
  20. CDRIVE

    555 timer reverse polarity circuit

    No problem. By the way, it's been quite a while since I used LT Spice but since it won't accept "M" did you try "Meg"? ;) Chris
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