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  1. N

    555 astable

    Power supply faulty? 555 timer variant you are using ok with 9 volts? Pots set to mid range to start? If 100k set to zero, in theory would short rail to discharge pin 7. Shorts on board? Chip the right way round?
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    Sit / Stand Desk Control System

    No help here, but maybe some explanation. . If it started working again in the past after a little percussive maintenence then likely something lis oose that should not be. Possible an old solder joint that needs resoldering. Perhaps a connector loose, but maybe less likely. . Where I am, most...
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    8x8x8 led cube

    Sorry. To your original question. There are lots of similar projects online. https://tutorial45.com/arduino-led-projects-led-cube/ Shows in an image an idea of how these things are wired. One with wires to the left, & coloured lines showing how common lines run.
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    8x8x8 led cube

    If the scan program is slow, you might see each line get voltage as it scans with a meter, assuming no scope available. If so, you can check for each line, including the one that does not light, getting power in turn. . So, where there is no voltage, problem is either nodrive upstream, or a...
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    Product counter below a tray

    If it moves, as on a conveyer. maybe add line scanner as a subclass to Harald Kapp's camera option.
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    Analogue correlation circuit to measure water flow in a pipe?

    A bit of a diversion: One of the best I have heard is an assisted reverb system demo in a music venue, where a pitch shifter was included in each reverb path. So the room provided a sort of harmony to anything going on, Not really something to do long term, but interesting to hear.
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    8x8x8 led cube

    Maybe it will help to just remind of the obvious. . These things work but energising each led. The number of wires is horrific, so the share wires, usually in some sort of a grid pattern. . If a single LED does notlight, then you look for its wires, connections. If a plane does notl light, go...
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    Analogue correlation circuit to measure water flow in a pipe?

    I once looked at an old calculator that used an ultrasonic delay line as memory. It was a wire. If you have matching sorted out, multi-tap for mutliple delays, but maybe not the easiest to build.
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    large dracast blew itself out and started to smell like burnt plastic- can it be salvaged?

    I googled "dracast" and it seems to be a light. . Sounds as if something got hot. Any obvious sign of something melting or burning. Will depend on the amount of damage. Got a service man you like to use? He/she can likely take a look at it for you and let you know.
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    Analogue correlation circuit to measure water flow in a pipe?

    Dude, Look back and smile at what used to happen. :) PDP11 & LSI11's and well, VMS are well worth reminiscing about. As are sonars of yesteryear. . BTW: What some fields call auto-correlation, others call cross-correlation, also no uniformity of correlation, versus correlation coefficient...
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    Install Bluetooth to treadmill

    What is the normal purpose of the connector on the treadmill board that you are using? Does this treadmill have information about the connector? Perhaps you can give a few more details.
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    Analogue correlation circuit to measure water flow in a pipe?

    As above, the phase comparator in a phase-locked loop is frequently a multiplier. Such often has an integrator attached or allowed for. Primarily, the time delay is what needs to be added. As Harald Kapp says, the time delay has to change in order to scan the delay, usually to peak up the...
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    3d printing a growing crystal

    Crystalising from a solution is not the only way. Eg melt & resolidify. zone melting https://en.wikipedia.org/wiki/Zone_melting Silicon crystals for Si valley &c. were, at least at one time, grown/purified by remelting in sections, that moved up the crystal, so they resolidified into an even...
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    Analogue correlation circuit to measure water flow in a pipe?

    I would have thought that it would be more common to use an active source and measure the time of flight in each direction as witrh some anemometers . https://patents.google.com/patent/US5152174 For such, I'd guess for simplicity one might use a sinusoidal signal, if one wanted to avoid pulse...
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    piezo-electric pump for mini hydraulic robot

    Just another thought. If you have not come across it before, you might want to google "squeezed film". If you make fluidic things really small so the fluid/air is thin you get weird effects where the effective viscosity can go up.
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    Activating Carbon for conductivity.

    Carbon rods from the centre of batteries? - used them for carbon arcs. Might be ok to take a file to one. Maybe start with a big battery? Sorry? What's the aim?
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    piezo-electric pump for mini hydraulic robot

    You have microfab capability? So by multiply by 10,000 you mean make a really long one (large area?) to get the hydraulic volume up? You might be able to get rid of those valves if you used a Tesla valve; a sort of hydraulic diode.
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    ES5100 ic help

    Another option could be to explain what sort of thing you'd be interested in doing and maybe people could suggest how to get there from a different starting point. The discussion here http://www.hix.com/arch/?page=issue&issueid=7739 Seems to not know what the chip is either, talking about it...
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    static electricity generators

    For small Van de Graffs is often mechanical friction at the source, on the belt, then accumulation of charge (with fixed capacitance: ball to ground) ==> voltage increase. There are many traditional machines that used static. Google Whimshurst machine...
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    static electricity generators

    Google whimshurst-machine, van de graff, take your socks of in a really dark room eg https://ucscphysicsdemo.sites.ucsc.edu/physics-5c6c-demos/whimshurst-machine/ https://en.wikipedia.org/wiki/Van_de_Graaff_generator Electrodes? Like he says graphite? Conductive pens
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