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    Voice recognition system

    Do you mean an ADC (analog-digital), not DAC (digital-analog)? That is, to take the analog waveform from the voice and convert it to a binary number, then send that to Simulink for analysis? I've never done voice recognition, but I imagine you'll need a high quality microphone, followed by a...
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    Rocket Staging Circuit

    Yep, that'll be your basic Estes igniter. I haven't done model rocketry for a number of years, but I recall that Estes igniters needed a lot more power to ignite compared to electric matches. That was probably intentional, as Estes stuff is used by people new to the hobby. If they're harder to...
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    Rocket Staging Circuit

    Not to start an argument, but I wouldn't attempt making my own igniters unless I knew exactly what I was doing. Anything you tried to bodge together by scraping, filing and gluing is liekly to be a)more dangerous and b)less reliable than anything you'll buy. Try getting some igniters that use...
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    Rocket Staging Circuit

    Or going the other way, you could use a couple of 1F 'supercaps', designed for memory retention. Let's assume you have three supercaps in series (assume each has a voltage rating of 5V), to give .333F. Charged to 12 volts, that's 4C of charge. Now take your igniter, which has a resistance of...
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    Problems with my 555 circuit

    If the capacitor is indeed the issue, agreed. Try changing the resistor values instead. In general in a 555 circuit, you should keep capacitor values small and resistor values high, within reason. Or that's what I've come to believe.
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    Dead accurate 1Hz clock signal???

    If you're powering your device from the mains, another option is to divide down your 50/60Hz signal to get 1Hz. Not particularly accurate, as the mains frequency wavers quite a lot. If you assume a +/- 1Hz deviation, that could be 30 minutes off in a day! Of course, most of the time the...
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    Using the LM331 V-F Converter

    Ah yes, that makes sense. Thanks. I was hoping not to need yet another op-amp, but ces't la vie...
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    Using the LM331 V-F Converter

    Hello all, First time posting. I've got a fair bit of hobby electronics experience, but I'm running into a wall as far as this particular project is concerned. I'm using an LM331 Voltage-Frequency converter, set up as per this diagram from the datasheet: Only differences: my Vs is about 12V...
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