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Type: Posts; User: betwixt

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  1. Closed: Re: ESP8266EX based wifi module does not respond on any AT commands ( E103-W01-IPX)

    I suggest you download Arduino IDE, even if you don't use it normally. It includes a flash utility via a serial or USB serial port and it will identify the device it sees connected. You can download...
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    Closed: Re: Generating a frequncy

    27MHz crystal osc, NE555 or similar to produce the pulses, use the pulses to bias the 27MHz oscillator. That's how almost all ASK transmitters work.

    For the antenna - it depends whether any...
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    Closed: Re: NodeMCU ESP-32S pitch

    ...but most ESP32 modules are 1.27mm pitch. Half of standard 0.1 inch spacing.
    If the module is on a board with USB interface and PSU, it is normally 2.54mm but width across sides varies form one...
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    Closed: Re: GPU with general purpose operating system

    My i7 has 8 cores.

    I don't think Nvidia give technical information about their hardware but I'm sure they don't have a general purpose instruction set like an i3/i5/i7. I think of Nvidia cores as...
  5. Closed: Re: Lenovo laptop problem during installing LINUX OS

    Agreed - lots more information needed. I have only once seen this happen and it was due to a UEFI 'lock' in the BIOS that prevented anything but Windows being installed. It took some defeating but I...
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    Closed: Re: uln2003 base resistor

    The input current is specified at 1.35mA with 3.85V applied.
    That means to drop the additional (24 - 3.85) = 20.15V at the same current, Ohms Law says R=V/I = 20.15/0.00135 = 14.925K.

    So 12K to...
  7. Closed: Re: Help in diode code v6 12 Panasonic Plasma TH-P42X30D

    I've attached the schematic.
    Unfortunately, it doesn't list the part numbers and I can't read the board references clearly except D104. As it seems to be only to protect against over current in the...
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    Closed: Re: Stable PWM during Voltage Loss

    You want the PWM to stay running when the power is removed?

    That will never happen, your best option is to move the PWM source to the plant end where the power is always present and then send it...
  9. Closed: Re: how to design a thermostat without Microcontroller?

    C1 or a second one in parallel with it should be DIRECTLY across the supply pins of U2 and preferably across the LM35 as well. When dealing with small signal changes you need to be absolutely sure...
  10. Closed: Re: ESP8266EX based wifi module does not respond on any AT commands ( E103-W01-IPX)

    The short flash indicates it is initializing properly. Visually, it looks like the many other ESP8266 16-pin modules and I would be very surprised if it didn't have the same connections.

    They are...
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    Closed: Re: Wireless door bell Sender not working

    I live on the coast with constant seawater nearby and in an area of very high rainfall, I have never had problems with corrosion.

    If the LED on the sender is coming on when you press the button,...
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    Closed: Re: hex code to Assembly

    You need a "disassembler", a program that reverse engineers the bytes back to their corresponding instructions. If your file is in .hex format (a text file) you might have to convert it back to...
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    [51]Closed: Re: SRAM WR pin is not anabled

    It seems the initial code (the bootloader) is being loaded but from there it either isn't configuring the SRAM interface pins or it isn't starting the program loader for some reason. My first...
  14. Closed: Re: Klystron output voltage, cavity field strength

    This is such a specialized field that I doubt may people would have experience to share. You are probably more likely to get answers by contacting a Klystron manufacturer. 75 Megawatts is a LOT of...
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    Closed: Re: Soldering on Battery Terminals

    Conductive epoxy is loaded with silver powder, not graphite. It can provide very low resistance connections but as it contains real metallic silver it is obviously rather expensive to buy. As...
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    Closed: Re: Soldering on Battery Terminals

    No, but it is an alternative that doesn't risk the danger of soldering directly to the battery.

    Spot welding is probably the best solution if you have the equipment to do it. Intense heat is...
  17. Closed: Re: LNK304 input voltage below the datasheet minimum value...damage?

    I can't see anything in the data sheet that suggests damage will occur but running it below specified input might have consequences on the regulated output.
    I assume you are using a schematic...
  18. Closed: Re: Tuning of varicap diode in a magnetic loop antenna based on modulating signal

    AFC was (until PLL came along) used extensively to keep receiver local oscillators tracking an incoming signal. For receiving, there would be little point in tuning the antenna so accurately, even...
  19. Closed: Re: Does my power converter have the correct voltages?

    The transformer (converter) should have a rating HIGHER than the console so you are OK. What Barry is saying is there is only at most 3W safety overhead so you are close to the limit. A transformer...
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    Closed: Re: Dirty circuit board causing failure

    No, the braid removes the solder by capillary action. The fine spacing between the wires in the braid causes a meniscus to form in the gaps and it's that that draws the solder into it. If you splay...
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    Closed: Re: Dirty circuit board causing failure

    I think we all know point 3 from personal experience :???:

    Well done for getting it going. If you want to replace the switch, keep the original for reference and search for a similar one. It...
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    Closed: Re: Dirty circuit board causing failure

    Desoldering wick is probably the best thing to use for that kind of component.
    The best temperature depends on the kind of solder you use. The older type which was made of lead and tin is best...
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    Closed: Re: Dirty circuit board causing failure

    You only use hot air for soldering/unsoldering surface mount components (SMD) but all the parts on that board are "through hole" so conventional soldering methods are used.

    I strongly suspect your...
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    Closed: Re: Dirty circuit board causing failure

    All that board holds is a volume control, a switch, an LED and an input jack socket. The switch sends a power signal back to the speakers and also turns the LED on or off.

    If it has stopped...
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    Closed: Re: Soldering on Battery Terminals

    Spot welding uses far less overall heating power. It is intense but only for a very short period.
    Soldering requires the surface to heat up to solder melting temperature and on a cell that might...
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