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    Temperature Control using DHT11 and arduino

    A simple way of doing fan program : Snap4Arduino, converts your block configuration into Arduino code. Regards, Dana.
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    Electronics Knowledge and Skill Level of This Forum

    The ARRL handbook is a good resource. Also youtube has quite a lot of fixit videos that can be quite instructive. There is a ton of magazines / books here, Electronics World, Popular Electronics.... with articles on learning as well as projects..... https://www.worldradiohistory.com/index.htm...
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    Triggering a passive infrared sensor?

    Melexis Infrared T sensors a possibility, available in various angles : https://www.melexis.com/en/products/temperature-sensor-ics These sensors not passive though. Intelligent (signal conditioning) would be more accurate description. Regards, Dana.
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    Thyristor and switch controlled power on.

    Thats not correct, the non repetitive single cycle rating is high, for mS kinds of on time, not time it takes to start a car in seconds. Go to digikey and screen for ratings. Attached is a "typical" part you could use Regards, Dana.
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    Temperature Control using DHT11 and arduino

    Make sure your sampling rate adheres to : https://cdn-learn.adafruit.com/downloads/pdf/dht.pdf Follow all the recommendations in the datasheet. Like pullups as discussed. Also if DHT11 directly in air flow path of fan consider locating it in an area that has more thermal inertia, eg...
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    Can an audio amplifier be used to transmit or receive radio signals?

    Page 393 on discusses propagation very low freq signals. https://archive.org/search?query=radio+propagation Knight
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    Can an audio amplifier be used to transmit or receive radio signals?

    Amateur Radio operators do significant experiments around 2200M band. https://archive.org/search?query=amateur+radio+vlf Propagation : https://archive.org/search?query=radio+propagation Regards, Dana.
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    Can an audio amplifier be used to transmit or receive radio signals?

    This might help in determining effects of E field reduction, magnetic preponderance -...
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    Target Shooting Game: A LED moves back and forth on a strip. Players press a push button to "shoot" when the LED is at a specific target position.

    And your first attempt at design is ? Describe your thinking, choice of board, or are you doing this in Verilog ? Picture and state of design ?
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    How to calculate on/off time with 2 Capacitors

    Could always do this with ATTINY85 and simple code. The above is mBlock, you code by drag and drop and config blocks, and it generates Arduino code to use. Regards, Dana.
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    Most effective way to build simple counter

    Color OLED display, say I2C to save pins, for the digits, and a general purpose micro to drive it and scan buttons.
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    Timer Circuit design needed... Help !!!

    https://electronics.stackexchange.com/questions/253867/reversing-direction-of-an-ac-universal-motor https://www.hunker.com/13414114/how-to-reverse-the-direction-of-a-single-phase-ac-motor/
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    Timer Circuit design needed... Help !!!

    Simple to code, drag and drop blocks, flexible. Use a SSR to drive the motor. https://www.electro-tech-online.com/articles/pulse-sequence-generator-smart-timer.938/ Or store bought appliance timer, maybe two, to effect reversal. There are timers with triggers...... Regards, Dana.
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    Advice on choosing components for basic control system

    Note because of 10V you would need external OpAmps to gain up to get the 10V full scale you require. So my statement "single chip" is inaccurate.
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    Advice on choosing components for basic control system

    One single chip possibility : Here is whats on this chip, multiple copies in most cases, everything from simple logic to complex peripherals like DSP Filter..... Its routable internal and oput to pins. All resources have prewritten drivers so you just essentially use high level f() calls to...
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    Is there any analog radio receiver that prevents fading of the SW reception?

    https://swling.com/blog/2021/09/guest-post-a-synchronous-detector-crash-course/ Synch detectors. But not strictly analog. Thats a little too broad a question. Generally speaking the vacuum tube radios really got into their own when they got mechanical or crystal filters in them to eliminate...
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    Looking for newer versions of IC

    Post the schematic will help to answer your question.
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    High Incremental Drain impedance (from the book The art of electronics)

    See here - https://www.edaboard.com/threads/high-incremental-drain-impedance-from-the-book-the-art-of-electronics.412857/#post-1783070 Regards, Dana.
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    Preamp/amp for tiny electret condenser mic

    https://www.ti.com/lit/ug/tidu765/tidu765.pdf https://cdn-learn.adafruit.com/downloads/pdf/adafruit-agc-electret-microphone-amplifier-max9814.pdf https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9810-MAX9810C.pdf https://www.ti.com/lit/pdf/sszt743 The above might help...
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    Can somebody design me a circuit plan of this gadget (dodos)?

    The forum is primarily here to help you do the design work. If you need some one to do this for you there are tons of consulting firms out there more than willing to engage at the service level. So what have you done so far, now that you have selected preferred parts list. And the problem you...
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