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  1. N

    Converting an old board

    I presume that this board does something. The micro interfaces to other electronics? If you are to replace the board, I guess you must interface to the same electronics. Do you have schematics? . Also, the "TN" in the name suggests an "industrial" spec part. Will it see a wide temperature range?
  2. N

    Possible switch overload?

    What's a COB? You refer to the LEDs as "cobs"? You seem to have two drivers. The driver at the end of the link is 100 volt to 265 volt input. Too much for your switch. As you have two drivers, cannot see how one switch controls two drivers, except on the input side. The switch will not do this...
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    Possible switch overload?

    COB? chip on board? One switch, two drivers? The switch appears to be SPST, one circuit. Perhaps you could share the circuit/schematic you plan. Use this switch to switch no more than 12 volts or 20 amp. If you are connecting your 20watt leds on 12 volts, then either or both are ok. Your power...
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    Voltage Drop and Cord Length?

    So this is mains power, right? Is the power source end a wall socket?
  5. N

    Voltage Drop and Cord Length?

    >>So to be clear, what I'm asking is if I only connect one device to one of these fingers, will the other fingers (not connected to anything) cause some voltage drop? Cause voltage drop? No. Not if they don;t draw any current. Experience voltage drop? Yes. Because the first cord is shared & has...
  6. N

    Problem with resistor

    Was it getting hot?
  7. N

    For Sale: FCH131 DTL anyone have an interest?

    For sale? Well, might be difficult to put a value on, if anyone did have an interest in DTL. Dual 4-input NAND. I guess with nand you can logically build just about anything. Original packaging, seems like just short of 200 of them, at first look. Anyway, I have some, not doing anything with...
  8. N

    Nixie clock runs too slowly

    Seems a similar post on allaboutcircuits. It appears to suggest that the thing you are turning is a capacitor trimmer, not a pot. They also seem to suggest that it's a type that multiple turns don't do what you might think. The trimmer may have only one turn, which means that it's a partial turn...
  9. N

    Solenoid drawing barely any current -- is this normal?

    Sorry, may be a silly question: Have you taken the tape off?
  10. N

    Solenoid drawing barely any current -- is this normal?

    Try 24 volts, with some current capability behind it? Got a bench supply?
  11. N

    Is anyone an expert in wafer fabrication?

    There's also more to it. You can do you own designs yet be fabless, by designing for a provider's process and sending them the design, much as you do with PCBs. You can also buy wafers and do things to them if you want your own fab. If you don;t have confidentiality issues, you can share a wafer...
  12. N

    Frequency response ?

    Might make a big difference how you drive it. I guess the ones from CD writers might also be fast? (No clue of the light output) I guess we're assuming you are going to try signalling? Got a fast receiver?
  13. N

    RF time of flight

    One ns a foot, there abouts. c = 3E8 That constant time delay to turn round rx to tx has to be accurate if you want accurate results. Two get twice the path length, of course. Passive reflector? Corner reflector = no delay. Sometimes as Ylli says a chirp, sweep can be workable and the differenct...
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    Fuses - breaking capacity, rupture capacity - fuse resistance

    Many thanks for the tutorial material on fuses. I'll try to be more clear. . When the fault occurs, the current will relate to the total circuit impedance, as taken by the fault current. If, worst case, the fault is immediately after the fuse, then no intended load impedance is involved. . As...
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    Fuses - breaking capacity, rupture capacity - fuse resistance

    Was asked one today that I could not answer. Appreciate any knowledge from any one who knows, has monitoed current when a fuse breaks, or opinion. . Calculations for the current that a fuse must successfully break. My friend argues that including the fuse normal resistance in the calculation as...
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    Help with repairing a gate

    If the problem is not purely mechanical, as you suggest, seized, lubricant &c. Then,.. If your unit is as in the image, exposed to the weather, the motor seems as if it gets a hard time. Also, motors often need other adjacent components to start up, such as capacitors, which are prone to fail...
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    Nerve/Brain/Muscle spike sensing

    From memory the only reasonable reason "Terminal man" was called that was it was his end. Despite the reference, the pacemaker sounds like urban myth, to me. . Implants, augmentations, sure, many would suggest that they will be necessary soon enough just to be competitive when applying for a...
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    Help with repairing a gate

    The circuit board hanging out the front is a little suspicious. . Remember, anything may have dangerous voltage on it at any stage. . Is it not powered, or maybe powered, but stuck? . When you stand by the gate and use the remote, do you hear anything? That is, does it try to move? . That is...
  19. N

    Nerve/Brain/Muscle spike sensing

    Not sure whether you want to catch the brain seizure (EEG) or the muscle activity (EMG). Either way, bio-medical electronics is a bit of an art. Even very small currents can have an effect. There are lots of EEG and EMG projects and circuits online. Read all the warnings, though. They will say...
  20. N

    Green laser

    Sorry, I am missing what you are trying to do. For a visual indication a laser pointer might do? they seem to have reasonably small, collimated, dots. Why green?
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