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  1. CDRIVE

    NPN and relay cct

    I read through this thread but why the more complicated of method of High Side switching is being employed over the simpler & more common Low Side method escapes me. :confused: The relay in question doesn't appear to be an existing component (OEM) in the vehicle. On the other hand it won't be...
  2. CDRIVE

    Position of one device relative to another.

    Hop, That's a classic synopsis but it probably has the OP more confused than before. :D It reminds me of Transmission Line Theory & Design. After all we're talking about only two conductors who's main purpose is to deliver a signal originating at one physical point and delivering it to another...
  3. CDRIVE

    Position of one device relative to another.

    That sounds very dangerous. Probably why I like it so much! :D Do ya get smoke like Dave suggests?
  4. CDRIVE

    Building a time delay relay circuit with 555 timer

    There! You went and did it again! Are you aware that there some out here that get woodys with that kind of talk. :p It's been many years but I used to run the S. Florida 1911 circuit. Just about all of the 1911's in those matches were accurized. By some miracle and thousands of rounds of...
  5. CDRIVE

    clever vibration motor driver?

    That has me doing a bit of head scratching because either my eyes are worse than I thought or that's a schottky diode shown in the 2N7000 data sheet. Chris
  6. CDRIVE

    Building a time delay relay circuit with 555 timer

    Hop, stop that. You're getting me all excited! It's like reading Weapon Porn. :D Chris
  7. CDRIVE

    clever vibration motor driver?

    Minder, I read it and saved it. It's something that I have to read again when my head is clear. My wife says " Yeah, when the hell is that going to be?" Hey, I'm doing my best! :) Thanks for posting it. It's an interesting read. Chris
  8. CDRIVE

    Building a time delay relay circuit with 555 timer

    Hop, that was.............AWESOME!;) Chris Edit: Are you sure about the "Aliens" thing? :p
  9. CDRIVE

    Problem with picaxe 14m2

    If you get the error message again take a screenshot of it and post it. Chris
  10. CDRIVE

    clever vibration motor driver?

    Ironically the 2N7000 data sheet has been in my FET folder since 2013 and I too purchased a handful of them back then. The transistor in my bike horn is the SOT-23 package with a 470Ω resistor from the PIC output to the Gate. I assumed it was a bipolar SMD because I thought 470Ω was a bit high...
  11. CDRIVE

    clever vibration motor driver?

    Hey Hop, you don't realize it but you just solved a mystery for me. I have a topic regarding an electronic bike horn where I reverse engineered the circuit and posted the schematic. In that schematic I indicate an NPN driving an autotransformer that jacks up the drive voltage to the Piezo...
  12. CDRIVE

    Building a time delay relay circuit with 555 timer

    It's not that I don't like LDRs. It's just that they respond to ambient light. They're used widely in outdoor lighting control using sunlight or lack of it for control. This is something you want to avoid. BTW, are you sure you need a relay? What are you turning on and off? Chris
  13. CDRIVE

    Building a time delay relay circuit with 555 timer

    If you're going to go the PIC rout let me introduce you to PICAXE. Talk about low stress and blazing fast learning curve! All the programming software is Free and so is the PDF Help files. Heck, if you have a real Serial Port on your PC you can construct the simple programming hardware yourself...
  14. CDRIVE

    Anyone know a simple circuit to make a signal generator using a crystal oscillator? (if possible)

    There's enough Crystal Oscillators on Google to guarantee eye glaze! :) Chris
  15. CDRIVE

    clever vibration motor driver?

    I just wanted you to know that despite Minder's good advice your ingenuity didn't go unnoticed. As an analog solution I too think it's very clever! :D Now don't get a swelled head over my statement. I discovered that I needed room in my frig for another bottle of wine. So I drank the bottle of...
  16. CDRIVE

    Building a time delay relay circuit with 555 timer

    They're cheaper and much faster. But most of all because 'I' like them!!!!!!!!!!!!!!!!!!!!!!!!!!!! :p BTW, what's the 1M for between Thld & Dchg? After all he's not building a 50-50 duty cycle oscillator. Chris EDIT: After reviewing my post I felt it needed more and larger exclamation points...
  17. CDRIVE

    Building a time delay relay circuit with 555 timer

    Yup, I have some thoughts. That circuit, while interesting, won't work. Tell us what relay hold time you want and what photocell you're using. BTW, a photocell (LDR) will work but a PhotoTransistor is a much better choice for this circuit. Chris
  18. CDRIVE

    why we use ports ?

    This was an EXCELLENT explanation. ;) This is funny but a good analogy too! :) This?? Well this is just funny. :p Chris
  19. CDRIVE

    Voltage Amplifier Stage (VAS) design

    OK guys, I think we're being very bad here and I think we're hijacking this topic. I'm heading out (rain or not) and peddling my butt off! Hopefully it will clear my head enough to input useful information but I'm not betting on it! Pray for me. I'm not all there and I'm going out into traffic...
  20. CDRIVE

    Voltage Amplifier Stage (VAS) design

    I hate to be a nabob of negativity but it's unlikely that anyone of us is going to invent something new. Disclaimer: It took me 15 minutes to type that sentence, so its validity is definitely in question. Chris
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