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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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    Mixing output from 3 op amps

    You might have G scaling in the 3 outputs and/or in the summer such that adding a 3'rd input pushes the summer into clipping. Your BPF ringing ? Schematic with values will help us to help you. Regards, Dana.
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    Max ii EPM240100C5N CPLD

    Attached should help.
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    Antenna conversion

    Go to youtube and search on "diy 2.4 ghz antenna", lots of diy possibilities. I have used one of these and gotten ~ 2 miles receiving a simple remote router with an antennae on it like what you have...
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    MOSFET Overheating and Nichrome Wire Always On in 48V Setup with RAMPS 1.4

    Post a schematic to verify your system interconnect to mosfet. If D8 is floating, the 10K in a electrically noisy environment may permit mosfet turn on. MOSFETS as they get hot Idrain drops, typically. Unless drive circuit also sensitive to T and starts driving harder, eg. more Vgs drive...
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    Monitoring inputs and getting alerts on my phone

    Use IFTTT service, MQTT running on an ESP8266 or ESP32. Tons of designs on web doing this. It will send a SMS to your phone triggered by your code. I use Tuniot to do the code, keeps one out of the weeds and quick design. Nodered also an excellent way oif doing MQTT. Just google "Nodered...
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    12 V lithium battery power supply with motor speed controller

    Gee and I was thinking all the US companies, ,many who get paid with Federal Corporate welfare and pay no taxes a whopping problem. Or the effective tax rate applied to US citizens is > 2x that of corporations.....or the corporate bailouts, no bailouts for the average US citizen, might just be...
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    Need Advice for a USB circuit board

    Your photos need to be .jpg files, jpeg. Also they cannot be large file sizes. But limit I do not know, a moderator can comment on that. The pics you tried did not post.
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    Powering a 5v led strip with batteries

    Connect your existing board/led and measure the V at output of board to the leds. I think the +5 is power V to board should be 5V, and thats the + connection to the board. Then pick a buck/boost that covers the range of battery voltages you need. Would also be helpful to measure the LED...
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    TFT Display Showing White Screen Issue

    Display part number ? Possibly post the schematic of the whole system/interface to LCD. Does display have any power up sequencing constraints ? Regards, Dana.
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    Powering a 5v led strip with batteries

    Is the board a boost converter itself ? Set such that LED string requirements the input at 5V will generate the correct boost ? If thats the case then eliminate that board, and use a buck/boost to maximize battery life. Efficiency of the board will also play into losses, hence battery life...
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    Chargers and batteries in series

    If you sue diodes real low drop ones would help the trip points on the charger, like when to start float charging if you have that feature, should continue to work properly. Like https://www.analog.com/en/products/max17614.html#part-details But if its just a bare bones type of charger a LV...
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    Old RCA CRT Console TV Repair

    I believe these are "Dipped Tantalums", the Blue Blobs. They have a history of devleoping shorts. Regards, Dana.
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    Inductive load issue (?) makes MCU go hard fault

    What rate are you trying to read the BMP180 ? The datasheet discusses conversion time versus mode. In the mS area. Hi res almost 100 mS.... Hantek : 1) Set it for edge trigger, AC, say 100 mV, infinite persistence, and give it a minute of acquisitions to see what your peak to peak noise is on...
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    A place to find modern equivalents of old components

    I think they are out of business now -
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    Inductive load issue (?) makes MCU go hard fault

    There are comparators with output latches that might be usable......for the transient detect troubleshooting.. https://www.analog.com/media/en/technical-documentation/data-sheets/ADCMP600_601_602.pdf Regards, Dana.
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    Inductive load issue (?) makes MCU go hard fault

    Three problems : 1) On power up cap, with no charge on it, looks like a short so relay turns on even though Q1 is off. 2) Q1 experiences large current spike discharging that cap when "normal" relay command is turned on. 2) Significant power spike in Q1 discharging cap. Problem you have is...
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    what pwm controller ic is this ?...

    2 of the cables, Red and Black, marked + and -, seem to indicate thats power supplied to board.....
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    what pwm controller ic is this ?...

    Possible ATTINY85 type. Here is what it takes to program it to make a V to PWM control : You config blocks and mBlock converts that to Arduino code (right window), you cut and paste into Arduino and program board/chip. Regards, Dana.
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    Inductive load issue (?) makes MCU go hard fault

    From chatgpt : For designing circuits involving microprocessors, including wiring and PCB layout, several application notes and resources can be extremely useful. Here are some recommended sources and types of application notes you might find helpful: ### **1. General Microprocessor Design:**...
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