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  1. CDRIVE

    Bypassing a momentary switch

    Yes Ed, it's damn near impossible to beat a bargain like that. Heck, an electronics head could have 99% of the parts needed to build it from scratch and still fall short paying for the 1% he didn't have! I've waited as much as a month for Chinese deliveries but the price and quality is worth the...
  2. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    You're a tad late to the party and your comments make it clear that you posted without reading any of this thread except the original post. This thread is three pages deep. Chris
  3. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    You're welcome Stu. Here's some important notes that should receive serious consideration. (1) The circuit as it's currently drawn has the ability to adjust the control (input) voltage to 0V when the Pot is turned to its fully clockwise extreme. (2) The circuit I drew assumed that an increase...
  4. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Here's another pictorial to help make the wiring clear. (1)The Black & White wires from the plug to the Pot remain intact. (2) Solder the Cap to the Pot's terminals. (3) Solder one of the Thermistor cable wires to the Pot's terminal as shown. (4) Cut the Red wire from the Pot's plug and...
  5. CDRIVE

    Building DIY Vacuum tubes

    George, how well your tubes perform is a separate matter entirely. It can not change or diminish the beauty of your work. The fact that you're fabricating vacuum tubes is, in itself, worthy of all the accolades I can possibly shower you with! Chris
  6. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Stu, this is a rough idea of how you can put this all together. Please keep in mind that I'm an avid cyclist that likes to do 30 miles daily (minimum),.. rain or shine, hot or cold. Recently my right 70 year old knee has been rebelling and cutting back my mileage. Consequently I socked down...
  7. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    You have to remove the knob to see if the Pot shaft is slotted on its end. I ask because the Pot setting is something that should not be easily changed by accidentally bumping it. So it's best to not leave the knob on it. Here's a modified schematic of my last one showing the remote Thermistor...
  8. CDRIVE

    Building DIY Vacuum tubes

    George, your work is magnificent! Chris
  9. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    The only component that will be connected to the pipe end of the cable will be the Thermistor. The Pot remains with the PCB. Is the end of the Pot's shaft slotted? Post the link to Thermistor you purchased. Ebay has plenty of plastic and aluminum enclosures. On that note the supplier of your...
  10. CDRIVE

    Building DIY Vacuum tubes

    Yeah, it's a visual feast! :) Chris
  11. CDRIVE

    How to modify 12-24v car phone charger?

    I greatly prefer the flux paste. I used the clear liquid type only once and found I hated it because it was highly conductive. Just insure that your soldering paste is intended for electronics ... not plumbing! Chris
  12. CDRIVE

    Do I Need A Resistor?

    A 10Ω resistor in series with your LED will insure that no damage will be inflicted on the LED, Source or Meter when making your current test. 10Ω is low enough to not change the current much if an integral resistor exists. Chris
  13. CDRIVE

    Building DIY Vacuum tubes

    Cool, cool, cool! I like the way your mind works. Give us more! Post some photos of your shop and machines. I own a vintage Tool Room SB Heavy10. Chris
  14. CDRIVE

    Bypassing a momentary switch

    Which switch are we talking about? There are 6 of them. Do you have any basic test equipment like a DMM? Chris
  15. CDRIVE

    Bypassing a momentary switch

    Hello tasehr and welcome to ElectronicsPoint. We're going to need more info from you. To start with is this switch connected to the high or low rail? Chris
  16. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Not to be anal but a Varistor is not a Thermistor but I'm sure Alec knows that and it's simply a typo. That said you can't replace the pot with only a Thermistor. It will have to be wired as Alec shows it in option 2 or 3. The Pot (wired as a Rheostat) is needed to create a calibrated voltage...
  17. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Yes, that's a 10KΩ Pot. Chris
  18. CDRIVE

    How to modify 12-24v car phone charger?

    I forgot to mention that if you have any soldering flux on hand it will greatly reduce chances of the tip oxidizing if applied to the tip while cold and prior to the my previous solder wrap instructions. Chris
  19. CDRIVE

    How to modify 12-24v car phone charger?

    That's because a very important step was missed. After a tip is cleaned (while it's cold) solder should be wrapped around it before it's turned on and gets hot. As the tip heats up the solder wrap will begin to melt. While it's heating but not up to peak temperature it helps to use a clean...
  20. CDRIVE

    How to control the speed of a 24vdc pump from circulating water temperature?

    Just unplug the Pot from the board before you measure it. This way it's divorced from the board. ;) Chris
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