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  1. DerFly1

    Detecting air flow

    Hello my friend, Do a net search on "air mass sensor" and "hot wire" as used for automotive engine management sensors. This should give you a few ideas to research. DF
  2. DerFly1

    Dual Variable Power Supply - looking for......

    Yes, not in the projects section.  There was a post in one of the forums, can't find it either. I hope someone elso know of it DF
  3. DerFly1

    Power Plugs

    Anderson Power-Poles?
  4. DerFly1

    Dual Variable Power Supply - looking for......

    H All, There was a project here detailing the above.  Built by a German guy, I think.  Beautiful construction with a kind of modular method.  The two supplies could be switched together for more voltage. It might have been 0 -15v x2 or similar.  PCB artwork was avaulabble and there were quite...
  5. DerFly1

    0-30 Vdc Stabilized Power Supply

    MP Thanks, I undestand wiring in series but the variable resistors in this project have three connections. To wire two variable reistors in series, how is this done. Could you possible supply a diagram? Many thanks, DerFly
  6. DerFly1

    0-30 Vdc Stabilized Power Supply

    Hello All, Seems we are all making our modifications to this project. I hope someone can help me with mine. I would like to use two variable resistors each for the adjustment of voltage and current to enable coarse and fine adjustment. The circuit calls for 100k variable resistors. Is it...
  7. DerFly1

    Convert 0-30V 3A PSU to 5A or more

    So, I am also building this PSU and have box, panel meters, transformer, etc. I have also finished the circuit board. I am thinking to use a thermistor circuit and 12 volt fan to keep the heatsink cool. Have not decoded to mount the heatsink inside or outside the box yet. I think of two ways...
  8. DerFly1

    0-30 Vdc Stabilized Power Supply

    Mixos, Thanks again. So, I will begin to source the components and begin to build the unit. This will take time (as everything when one has many things to do). I will let you know my experiences. I am thinking that the PN2219 is the same as the 2N2219, only with a different package, so I...
  9. DerFly1

    0-30 Vdc Stabilized Power Supply

    Mikos, Thanks for your reply! Next question, can I substitute the 2N2219 with a 2N2222? Thanks for your answer to these perhaps very stupid questions. Derfly.
  10. DerFly1

    0-30 Vdc Stabilized Power Supply

    Hello All, I am currently looking for the components to put this project together. It seems that the Op Amp TL081 is not so easy to find in my area. National Semiconductor says that the TL081 can be used to upgrade circuits which use the LM741. Also that the LF411 can be used as a...
  11. DerFly1

    LM350 Variable Power Source

    mozikluv, thanks for the ideas. I already have the 24v 3a transformer, so it is a question of finding a regulator that can handle 3a. I think iI will try the LM338. Do you have any experience with the variable current 30v 3a supply on this site? Think I might try it next. DerFly
  12. DerFly1

    LM350 Variable Power Source

    Hello All, Just finished building a modification of the following circuit. http://www.uoguelph.ca/~antoon/circ/vps.htm The changes I made were to use a 24v 3a transformer as this was available at the time. I also used an LM350 instead of LM317 as it is rated at 3A. Also used a 2A fuse and...
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