author
16CommentsJoined February 14th, 2016
I'm just a person interested in a lot of things. My Instructables mainly focus on vintage computer tech and radiation. Please feel free to comment on my posts if there is a particular project you'd like to see. Current project: How to make a half-adder
  • Ruby Laser commented on Teslaling's instructable DIY CMOS RAM Memory2 months ago
    DIY CMOS RAM Memory

    I agree. In addition I also think that the plastic encapsulation of the MOSFETS (epoxy) would play a role in slowing it down. Even though it's not very much (maybe a couple nf). But still, it's worth considering.

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  • How to Make a Cloud Chamber (Cosmic Ray Detector)

    Really? To the best of my knowledge the magnets would ABSOLUTELY affect the experiment. This is because the particles you are detecting all have charges and ,as you may know, charged particles are affected by magnetic fields.

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  • The SPACEBOX - Portable Amp Completely From an Old TV!

    To the best of my knowledge the flyback transformer actually can hold some charge due to the fact that it has a voltage multiplier and capacitor in the output. If we do the calculation for energy storage in a capacitor then we can figure that there is probably around 450 joules of energy stored. We can calculate this using the values 30,000 volts and 1 microfarad, and plug those into the equation.

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  • Ruby Laser commented on tanner_tech's instructable Simplest Geiger Counter2 months ago
    Simplest Geiger Counter

    Nice idea, but I'd like to point out that a full wave rectifier wouldn't do anything to help. The ringing has to do with the physical oscillation of the transformer core which produces hearing-range sound.

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  • Ruby Laser commented on JayantBh's instructable Siren Generation Using IC UM35612 months ago
    Siren Generation Using IC UM3561

    Note for anyone wanting to replicate this without using a UM3561: The UM3561 IC datasheet specifically says that it uses a mask ROM (which basically means it is not programmed electrically, rather it is "programmed" during chip exposure). This also means that it cannot be replaced easily with, for example, a 555 timer.However, if someone HAD to replicate it without a UM3561 it COULD be done using just capacitors, wire, resistors, transistors, and diodes. To do it make a shift register circuit in a decade counter configuration so that each clock cycle it activates the next address pin of a Diode-ROM array (and turns off the previous one). Lastly, a selector circuit must be made to activate the different ROMs, and a DAC (digital to analog converter) must be added to convert the ...

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    Note for anyone wanting to replicate this without using a UM3561: The UM3561 IC datasheet specifically says that it uses a mask ROM (which basically means it is not programmed electrically, rather it is "programmed" during chip exposure). This also means that it cannot be replaced easily with, for example, a 555 timer.However, if someone HAD to replicate it without a UM3561 it COULD be done using just capacitors, wire, resistors, transistors, and diodes. To do it make a shift register circuit in a decade counter configuration so that each clock cycle it activates the next address pin of a Diode-ROM array (and turns off the previous one). Lastly, a selector circuit must be made to activate the different ROMs, and a DAC (digital to analog converter) must be added to convert the binary values into an analog signal.However, the diode ROM array would require a lot of transistors and a lot of diodes (around 30,000 transistors and an uncountable number of diodes). This is because an audio signal is between 500 and 1550 hertz for a typical siren. Which means the number of transistors (just for the ROM) can be calculated (in theory) by using the calculation:(1550 X 10) X 5.5.And the maximum diode count (for the ROM) could be calculated by multiplying the value from the last equation by 8 (the lowest bit value required for decent sound quality). This value is probably off by about 10-30% because all of the values in the Diode-ROM array are not going to be zero.

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  • Ruby Laser commented on tanner_tech's instructable Simplest Geiger Counter2 months ago
    Simplest Geiger Counter

    Well the possibility of neutron detection sure is unlikely but I want to point out that it IS possible. This is because when a neutron interacts with hydrogen (which is present in the glass) it gives off a proton which is easily detectable with a Geiger counter.

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  • Ruby Laser commented on Teslaling's instructable DIY CMOS RAM Memory2 months ago
    DIY CMOS RAM Memory

    Oh yeah, nice project!!! I'm currently working on some I2C ROM for my Arduino. Do you have any thoughts on it? Have you done something similar in the past?

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  • Ruby Laser commented on Teslaling's instructable Build Your Own 555 Timer2 months ago
    Build Your Own 555 Timer

    Is it REALLY a 555 timer. It seems to me like this doesn't fully qualify as a 555 timer since it doesn't have the same time constant formula (due to the fact that in this "555 timer" the switching current for all the transistors is different than those in a commercial 555 timer. Still cool though!

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  • Ruby Laser commented on Teslaling's instructable DIY RAM for Your Micro2 months ago
    DIY RAM for Your Micro

    Not true, not true at all. That's why there are sub-categories of RAM called "volatile" and "non-volatile". Non-volatile means it retains it's data even after its power is remover. An example of this is core-memory (not to be confused with core-rope ROM), both of which were used on Apollo.

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  • RadSense - a Rad SolidState Gamma Radiation Detector

    Oh yeah, I also spotted a little bit of disinformation though. In the Instructable you stated that the detectors undergo "performance degradation" from high radiation fields which is simply not true. It should be noted that only electronics using EEPROM and other low capacitance devices are majorly affected by radiation (this is due to ionizing radiation causing ionization and thus conduction in the silicon dioxide insulating layer). Other than that the radiation has basically no effects on electronics.

    Nice!!! I LOVE the use of silicon detectors, I fact I've actually been doing some research of my own. One technique I've found that helped reduce noise involves using a 4-5 second delay circuit with a peak detector and comparator to help auto calibrate it against noise from RF waves as well as small light leaks. Keep exploring!

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  • Ruby Laser commented on Teslaling's instructable DIY SRAM3 months ago
    DIY SRAM

    Actually when you look at the concepts behind SRAM and DRAM it is easy to see that DRAM actually consumes less power since once the capacitor is charged it requires virtually no current.

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  • Alternate Probes for a CDV-700 Geiger Counter

    Even though i'm not the author, I'd like to answer the question. You definitely CAN you that tube with the CDV-700 but you'll need to make a slight modification in order to step down the voltage adequately. To do it you need to identify the high voltage regulator tube in your CDV-700 (look up the schematic if you're having trouble fining it). Then, once you found it you want to buy four 100v zener diodes, branch them together, and connect them across the tube. This will effectively bypass the regulator tube and replace it with the zener diodes.

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