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Everything posted by loribennms

  1. To create a digital display continuity tester, you will need the following components: Microcontroller: Choose a microcontroller board such as Arduino or Raspberry Pi to control the digital display and handle the continuity testing logic. Digital Display: Select a suitable digital display such as a seven-segment display or an LCD display to show the pin numbers or continuity status. Pin Probes: Use probe wires or connectors to connect to the pins of the circular connector for testing continuity. Resistors: Depending on the specifications of your microcontroller and digital display, you may need resistors to limit the current and protect the components. Here's a general outline of the circuit and functionality: Connect the pin probes to the microcontroller's input pins, ensuring proper grounding. Write a program on the microcontroller to control the continuity testing logic. This program should check the input pins' continuity and control the digital display accordingly. Depending on the continuity test results, the microcontroller will send signals to the digital display to show the pin numbers or continuity status. You may need to include debouncing mechanisms in your program to handle any bouncing signals during pin probing. Remember to follow best practices for electrical safety, such as using appropriate insulation for the probes and ensuring the circuit is properly grounded. While this is a general overview, the specific details of the circuit and code will depend on your chosen microcontroller, digital display, and the requirements of your continuity tester. It's recommended to refer to the datasheets and documentation of the components you select and seek additional guidance from online forums or electronics communities for more specific assistance.
  2. If you're looking to connect a small audio sensor board directly to a speaker without using an Arduino board, you'll need to design a simple analog circuit to amplify and process the audio signal. Here are a few general steps to consider: Study the specifications and documentation of the Sound Detector board you own to understand its input and output requirements. Determine the specifications of the speaker you intend to use, such as its impedance and power handling capabilities. This information will help you design a circuit that matches the speaker's requirements. Research basic audio amplifier circuits that can be used to amplify the signal from the audio sensor board. Look for amplifier designs that fit your project's needs, such as a single-ended amplifier or a class AB amplifier. Choose appropriate components for your analog circuit, including resistors, capacitors, and transistors or operational amplifiers. The specific values and types of components will depend on the amplifier circuit you select. Design the circuit on a breadboard or a PCB (Printed Circuit Board), following the schematic diagram provided by the amplifier circuit design. Take care to ensure proper connections and component placement. Test the circuit using the audio sensor board as the input and the speaker as the output. Make adjustments as necessary to optimize the sound quality and volume levels. Please note that designing and building analog circuits requires a good understanding of electronics and circuit design principles. If you're not familiar with these concepts, it may be beneficial to seek assistance from an experienced electronics hobbyist or consult resources such as electronics forums or books on audio circuit design.
  3. It seems like you're providing additional information about the features and capabilities of a networking device or system that utilizes the IPQ5018 SoC and supports WiFi 6E and Bluetooth 5.1. The details you mentioned highlight the specifications of the device, including the processor, memory, wireless capabilities, and expansion options. Regarding the historical context of Wi-Fi, you're mentioning the evolution of different generations of the 802.11 standard. The first-generation 802.11 standard had a low wireless speed of 2Mbps. Subsequent generations like 802.11b and 802.11g increased the physical layer speed to 11Mbps, and Wi-Fi started gaining popularity with the introduction of laptops and home wireless routers. If you have any specific questions or need further information, please let me know, and I'll be happy to assist you.
  4. Breadboard - this is a reusable circuit board that allows you to easily connect electronic components. LED (Light Emitting Diode) - this is a type of electronic component that emits light when electricity is passed through it. Resistor - this is another electronic component that helps control the amount of current flowing through the LED. Jumper wires - these are wires used to connect the components on the breadboard. Once you have these components, you can start building your circuit on the breadboard. Here are the steps you can follow: Place the LED on the breadboard. The LED has two legs, a shorter one and a longer one. The shorter leg is the negative (-) leg, and the longer one is the positive (+) leg. Connect the resistor to the positive (+) leg of the LED. The resistor helps limit the amount of current flowing through the LED. Connect one end of a jumper wire to the negative (-) leg of the LED, and the other end to a ground (GND) pin on your microcontroller or power source. Connect the other end of the resistor to a power source. Depending on the voltage of your LED, you can use a 5V or 3.3V power source. Turn on your power source and your LED should light up! With this basic circuit, you can add more LEDs and create different patterns to make your landing deck more visually appealing. You can also add other sensors or components to make it more functional. I hope this helps you get started with your project. If you have any further questions, feel free to ask!
  5. In summary, LDR stands for Light Dependent Resistor, which is a special type of resistor that changes its resistance based on the intensity of light. It is often used as a light sensor or meter and can be used in various applications such as automatic street lights, emergency lights, and security systems. In the LED emergency light circuit, the LDR is used to control the output LED connected to a BD139 NPN transistor and a 33Ω 1W resistor. The circuit turns on the LED when there is no light on the LDR face and can be used as an emergency backup for security systems and industrial sites, as well as in home and office settings to avoid sudden power outages.
  6. Thank you for your question! Based on your requirements, you can create the circuit using the following components: 3 12-volt LEDs 1 5-volt fan 1 switch 1 9-volt battery Appropriate resistors for the LEDs Here's a basic schematic diagram for the circuit: lua Copy code +9V | R1 +---LED1---+ | | | +-----+ | | R2 | | | | +-----+ | | R3 | | | | +-----+---LED2--+ | R4 | | | | +-----+ | | R5 | | | | +-----+---LED3--+ | | | | | | | FAN | +-----+ | | | | R6 | | | | | GND---+---------+ | S1 | GND In this circuit, the three LEDs are connected in parallel with their appropriate resistors R1, R2, and R3. The fan is also connected in parallel with resistor R6. The switch S1 is connected between the positive terminal of the battery and the positive rail of the circuit. When the switch is closed, it completes the circuit and allows current to flow through the LEDs and the fan. The appropriate resistors are used to limit the current flowing through the LEDs to prevent them from burning out. Resistor R6 is used to limit the current flowing through the fan and protect it from damage. Here are the steps you can follow to build the circuit: Calculate the appropriate resistor values for the LEDs based on their voltage and current ratings. Connect the LEDs in parallel with their respective resistors. Connect the fan in parallel with a suitable resistor. Connect the switch between the positive terminal of the battery and the positive rail of the circuit. Test the circuit to make sure everything is working as expected. I hope this helps you design your circuit. If you have any further questions or need more guidance, feel free to ask!
  7. The chokes may actually be making things worse. CEMF by definition is of reverse polarity so the first thing to try is simply diodes across the batteries, wired so normally not conducting of course. I would suggest fast Schottky diodes rated at 1A or more. You may find it best to physically connect them to the wires "pulse 1" and "pulse 2" rather than across the battery terminals to reduce the CEMF path length to ground, you want to trap the pulse at the earliest opportunity as it reaches the circuit.
  8. If you get a "for parts or not working" power supply from certain reputable manufacturers you should be able to fix it. Make sure you can find the service manual and check it that the device does not have proprietary parts. Certain power supplies are so common repair parts are also common. I found a triple Sorensen XT power supply that already was 2/3 working units so I just fixed the part that wasnt and now I have a really solid triple supply. Apart from a hum (a physical hum, the DC output is incredibly quiet, as quiet as a battery) its perfect. But it weighs maybe 30 or 40 lbs. Its a real boat anchor. If it was bought 100% working it would have cost me at least $250 even used and >35 yrs old.
  9. I have gone over 54K miles on my two electric assist bikes. One of the halls started acting up on my mid-drive MAC bike at 8K miles. At 9K it stopped working all together. I replaced the cheap sensored controller with a cheap sensorless, and rode another 21K miles. It sort of worked, but was never as efficient, and growled unhappily on startup much of the time. My big DD cargo bike worked perfectly for 22K miles, but has now started acting up intermittently over the last 1,200 miles. Being a very high power DD, when one of the halls quits, it is like one of my old 4 cylinder cars when a plug would fail...rough running, noisy, low torque. As with the MAC, the problem is happening more frequently, for longer, and I eventually will have to give up,and do something. Here is my dilemma. I am old, with the failing eyesight, and shaky hands that come with age. I don't feel confident to replace the halls, and understand that there is a good chance of ruining them with static from my hands when doing the installation. I searched around and found someone who had put external halls on a skateboard outrunner motor. Getting halls near the magnets on a hubmotor would probably be impossible with the spokes in the way, but what about a simple magnet ring, like people use for pedelec? It seems like an external encoder would be a great aftermarket product for somebody....Justin?
  10. I used Lm386 as an audio amplifier, 9V , and when I check the output waveform it amplifies but it was clipped. I just copied the circuit diagram on its datasheet. How to fix this? Any advice there in making an audio amplifier with good sound quality ?
  11. Hi everyone! One question: How do I proof the reliability or validity of the automatic calibration I do with the analytical balance? I never questioned it, but now I am being told that the only calibration is the one done by the certified metrologist every six months because he presents the whole set of statistical data and everything. Apparently I can only do verifications.... Any advice? Thanks! thanks in advance for any help
  12. One voltage step is typically more efficient than additional steps, i.e., use one converter for each desired output stepping down once form the source voltage, 14-12, 14-9 and 14-5. Worth noting that your 4S LFP won't be at 14V for very long. You'll rapidly drop into the low to mid 13s under load. 2-3) don't know. 4) No, but % efficiency is more related to the power being converted. Very low power tends to be very inefficient. Moderate power tends to be efficient (92% "max"), max power tends to be a little less efficient. "Power" is relative to rated power, i.e., 0.5W on a 50W unit would be very inefficient, but 0.5W on 1W unit would be very efficient. 5) I suspect they may drift slightly with temperature. I'd put a small LED voltmeter on each output for fun.
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