Tell us about yourself!

Complete Your Profile
  • MarkH43 commented on stinkyabb's instructable Simple PIR DSLR Camera Trap1 year ago
    Simple PIR DSLR Camera Trap

    A great project if nothing other than for the Red squirrel Picture,... Brilliant,. and so lucky to be able to see a Red Squirrel,.. we only have pesky Grey ones where I live....

    View Instructable »
  • MarkH43 commented on ValentinJ2's instructable ESP8266 wifi switch1 year ago
    ESP8266 wifi switch

    You may be correct,.. but the modules I looked at do not give a simple circuit diagram to review, ( have you found one ).. but the picture does show a small diode, transistor, LED, and a resistor. I might guess the diode is there for reverse polarity protection, as it only seems to be a 1N4001 type rectifying diode,.. not fast enough for reverse transients protection.I typed "driving a relay diode protection" into google and got loads of example circuits if you care to follow up etc.Rgds

    View Instructable »
  • MarkH43 commented on ValentinJ2's instructable ESP8266 wifi switch1 year ago
    ESP8266 wifi switch

    Nice little design,.. but something you may want to consider is to install a small diode ( eg. 1N4148 ) across the relay coil to capture the switching transient excursions,.. as these transients can damage other circuitry.... but just a precaution....Rgds

    View Instructable »
  • DIY Bench Power Supply With Old Computer SMPS

    Its nice to see old tech been reused,.. but the unskilled diy-er should be very careful when solder wires/joints within the power supply as solder splutter can very easily create unexpected shorts,.. protect the exposed electronics when creating solder loops for the tags etc.Also,. users should be aware these supplies all share a common ground,.. so they are NOT isolated,.. also using one of these units as a test bench supply is never a good idea as there is no control over the current,.. other than during a short, and in my many years of electronics, a current controlled supply was essential when developing new kit.These units are designed to work within another enclosure,.. so they are never strictly speaking exposed to the outside world, all that is considered is the expelling of exc...

    see more »

    Its nice to see old tech been reused,.. but the unskilled diy-er should be very careful when solder wires/joints within the power supply as solder splutter can very easily create unexpected shorts,.. protect the exposed electronics when creating solder loops for the tags etc.Also,. users should be aware these supplies all share a common ground,.. so they are NOT isolated,.. also using one of these units as a test bench supply is never a good idea as there is no control over the current,.. other than during a short, and in my many years of electronics, a current controlled supply was essential when developing new kit.These units are designed to work within another enclosure,.. so they are never strictly speaking exposed to the outside world, all that is considered is the expelling of excess heat etc,... not stopping foreign objects from entering the control electronics.Be safe not sorry!!!

    View Instructable »
  • Adjustable High Current Lab SMPS Out of a Standard ATX PS

    Great use of an old ATX power supply, but I believe there is a small error in your final schematic,... the rectifying diodes from the transformer are the wrong way round...

    View Instructable »