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  1. N

    I think I'm starting a collection

    Ok, intrigued. What exactly does a "philoscope" do? Googling it lead somewhere quite different.
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    Question concerning Arduino and C++

    I guess my only additional comment that I did not notice made goes like this. C++ is different. It is object oriented. It is possible and often done to programme C language things in C++ syntax. But, the strength of the language over C is objects. You might want to find some tutorials on object...
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    Circuits to build for a beginner!

    So the consenssus seems to be combine study with experiments. I have to agree that these are great books. There are many out there with older editions online free that vary in terms of the amount of theory. . I started building circuits with only a very basic knowledge, read all the books I...
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    Strong slide switch

    Wafer switch? Customisable wafers and number of wafers? With a strong detent? See image above? :)
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    Strong slide switch

    Sorry, how do you turn it off again? It appears to stay on after the first push. Sorry, failing to grasp the aim, here.
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    Strong slide switch

    ? Does it have to slide? How many positions? How many poles?
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    Accelerometers for accurately indicating position?

    In principle yes. In practice: no. . Acceleration integrated/accumulated is velocity. Velocity intergrated/accumulated is distance. Any DC offset at either stage integrates/accumulates to either a increasing velocity error, or an increasing distance error. . So zero-ing not really possible over...
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    Artifact-less ISM band radio transmitter part

    in front of /or after? In frequency or time?
  9. N

    I will be missing in action

    Sounds awesome. My team leader is currently anchored in Yokohama Harbour confined to cabin for 2 weeks. Hope yours goes better than his did.
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    Explain QPSK and ODFM

    Imaging that I have a whole pile of carriers, all running separately. Modulate each carrier with something, say QPSK. Now I tell you that I chose the carriers and the modulation so that the spectra of each will not interfer with the others. Add all the modulated carrier signals together. ...
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    Purpose of cap on collector

    In summary, it seems that you should consider other circuits or at least compare. Particularly look for ones with a current limit resistor between the sensor and the next transistor, perhaps smoothing on the power supply and maybe what different triggering filtering, conditioning is used.
  12. N

    Purpose of cap on collector

  13. N

    Purpose of cap on collector

    Sorry not your question, but interesting circuit. I only found a datasheet from Vishay which is brief.The equivalent circuit shows an NPN, grounded emitter, almost open collector (80K to rail). IN your circuit this drives directly a PNP base with emitter on the top rail. The data sheet says 5mA...
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    Transistor base-emitter voltage pulled down

    I gurss the result depends somewhat on the nature of that microphone but if it is the source of an ac waveform, impressed on the left of the capacitor, c1, then some proportion of that influence results in a current into the base of Q1. If the base emitter junction of Q1 ultimately looks like a...
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    I think I'm starting a collection

    Nice one, good condition. A collection of what? bridges? Older equipment? Any types you are feeling that you are missing?
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    How can i decode the IR protocol from these details?

    Having the timing settings makes it easier to guess how to round things. The actual protocol probably only has a few times, manual delays, frame, bit, maybe mark and space. OK attempt top insert a .png failed.
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    How can i decode the IR protocol from these details?

    So, to attempt to summarise: Blind reverse-engineering of the timing will be difficult, but with soem context info it could be do-able. What is the source? What type of thing is the source? Type of appliance? Modem, idea ot communication rate? Brand of product? Any idea of the timing settings of...
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    Electronic door lock is safe?

    I suspect that's the driver for electric strikes.In the simple case, you have a standard lock with the ability to operate without power. The strike simply allows it to open without the manual lock opening. A little different if you want deadbolts.
  19. N

    Electronic door lock is safe?

    Generally electrical doors are done not with an electronic lock, but with an electric strike, the side that is in the wall. As with all things, there are two types. Some fail/power off open and some default to locked.
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    Need help identifying an electronic component

    Different angle? Connections on the bottom?
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