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  1. CDRIVE

    Change LM2575 minimum input voltage to 8 volt

    Oh, I evidently didn't understand his question. Thanks for the clarification Alec. Chris
  2. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    Not that it's never happened before but has anyone else noticed that Duke replied in post 2. The OP thanked him in post 3 and we've been talking to ourselves ever since; .. :rolleyes: .... and this is post #22!! :eek: Chris
  3. CDRIVE

    Mic detection circuit

    I forgot to be specific! Do the measurements with the Mic unplugged and amp unplugged from the mains. This test is to determine that there's no DC paths between any of the Mic input pins. Chris
  4. CDRIVE

    Mic detection circuit

    There's a more than even chance that I shouldn't be posting this. I'm not sure if I'm all there at the moment. That said, your measurements seem to indicate that this is not a balanced mic input. It also appears that the mic input jack sees a short (similar to Mic2 in my schematic) when the Mic...
  5. CDRIVE

    Mic detection circuit

    Please re-read what you posted. I'll admit that I'm half tanked right now but I see another contradiction. Chris Edit & after thought: Does "nothing" mean open, IE infinity?
  6. CDRIVE

    What is a buffer for?

    I don't want to yuck this thread up but I would like to share something. Prior to me ever touching a PC, I think I was 50 back then, Buffers were something placed between circuits like oscillators and the following stages. Their purpose was and still is to reduce or eliminate any changes in...
  7. CDRIVE

    Change LM2575 minimum input voltage to 8 volt

    Odd. My TI data sheet specs 4.75V to 40V input. Disclaimer: It's Sunday afternoon, raining heavily and I'm working diligently at sampling my alcoholic stores. I'm an expert at this sadly diminishing science. :D Chris
  8. CDRIVE

    Mic detection circuit

    For the life of me I don't know why I do this. I should have been on my bike an hour ago before the afternoon Monsoons roll in. Especially for someone who'd rather verbally spar with people that are only trying to help you! Anyway, I drew up 4 different scenarios of how your Mic is possibly...
  9. CDRIVE

    Mic detection circuit

    No we can't and that's the primary and still unknown issue here. You don't need a $1000.00 Fluke to determine if the mic circuit is open, shorted or other when the mic switch is off. The cheapest POS DMM on the market will suffice for these measurements. That includes the $10.00 meter you have...
  10. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    Actually, I've been considering getting a Horror Freight swatter fryer. ;) Chris
  11. CDRIVE

    Mic detection circuit

    I suspect it's statements like this that prompted Steve's post with Ohmmeter instructions. Do you realize that the reply quoted above is totally contradictory? We'll never be able to help you if we're not speaking the same language. We have to know that when we're referring to... ON, OFF...
  12. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    Hi Alec, just so you know... I believe I'm a bit guilty of the "Peck The New Guy Syndrome". :D However, you took the pecking like a pro! ;) I didn't detect so much as a little rattle in your replies. :p Welcome! Chris
  13. CDRIVE

    Problem with picaxe 14m2

    Dev, what I found odd is that the Picaxe prompt screens presented to you evidently were formatted for their USB/Serial cable. The first screen prompt that's presented to the user has a dropdown box at the top of the window. If there's multiple serial ports (whether they be real or USB/Serial) on...
  14. CDRIVE

    Problem with picaxe 14m2

    0 - 5V levels are what I'd expect to see using the Axe-027 USB/Serial cable. It's not what I'd expect when using a real serial port. I would expect approximately what you measured. -10V & +11V is within RS232 specs. When the active LED is clicked the Picaxe software is putting the TD (Transmit...
  15. CDRIVE

    Mic detection circuit

    rer, judging strictly by your replies the bigger problem might be understanding us. If we give you possible solutions will you be able to execute it? Many topics begin like this one and progress into various solutions described by text and schematics that we will post. The OP must be able to...
  16. CDRIVE

    Mic detection circuit

    My guess is that the mic switch (when OFF) would open the connection to the voice coil and short the audio lines to the amp input. But this is just speculation. You should be able to confirm this with an ohmmeter. You should read ~ 600Ω (Switch ON) and ~ 0Ω (Switch OFF). Chris
  17. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    One other thought. I see you designed this with a 6V source. It would be more power efficient to series up some of those LEDs. Rear bike lights are Red LEDs. Chris
  18. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    Just my opinion but it's a needless waste of power. Power is going to be dissipated with it or without it. I'd rather dissipate it in the LEDs. I cycle an average of 11,000 miles a year. My wife has been side swiped, knocked off her bike and injured. I've (by the grace of God) escaped these...
  19. CDRIVE

    Help with a flasher circuit with 555 Timer IC

    Alaa, just a bit curious. .. Are you designing a rear bike light with brake light capability? Chris
  20. CDRIVE

    1V audio burst every OTHER pushbutton

    Brilliant! I love the concept! Devin's project is now growing a brain. Chris
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