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Type: Posts; User: eepty

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  1. Closed: How to implement timer to read sensor signal periodically without MCU

    I would like to read the signal from a sensor periodically, for example 0.5Hz, but my circuit does not have a microcontroller.

    Firstly, I think that if I can implement a timer, like a 555timer,...
  2. Closed: Is large capacitor needed for high load battery?

    In my application, I have a Li-ion battery, which is 3-cells in series, 5000mAh, max. 30C discharge. I will switch on and off of a load about 22A. Do I need to add a large electrolytic capacitor at...
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    Closed: Re: Why Li-po battery voltage drop

    Thank you. I have also tested the temperature of the battery pack when I discharge it at about 22A. The battery pack has a soft enclosure, I put the temperature sensors at 4 different positions. 3 of...
  4. Closed: Re: Safety Issue - Ferromagnetic metal under induction cooker

    Which part of the manual lead you to think that they have sheilding?
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    Closed: Why Li-po battery voltage drop

    I am testing for a high discharge rate battery pack. The specification of the battery pack shows it is 3S (11.1V), 5000mAh with 35C max discharge rate. I tested it by fully charged it and then...
  6. Closed: Re: Safety Issue - Ferromagnetic metal under induction cooker

    I have a similar idea, but I am not sure if the shielding is “strong” enough to shield the magnetic field from the induction cooker.

    I have checked some induction cookers in the market, all of...
  7. Closed: Safety Issue - Ferromagnetic metal under induction cooker

    Recently I noticed an accident that somebody put a stainless steel plate under a portable induction cooker. As a result the plate get heated and the heat melted the enclosure of the induction cooker...
  8. Closed: Please help me to understand the transistor circuit

    Attached a transistor circuit here. I do not understand why the base and emitter of the NPN is connected together, and what is it use for?

    148255

    Thank you.
  9. Closed: Any Li-Po protection solution for pack protection?

    I would like to use the RC Li-Po battery such as these 11.1V RC batteries for a project. However these batteries do not embedded a protection board so I want to add one. I found that most of the...
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    Closed: Re: Is resistor an electronic component?

    The IEC60335 scope is for low voltage home appliance, so I think brain is not classified in this category.

    - - - Updated - - -



    I copied all the text in the “definition” section for...
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    Closed: Is resistor an electronic component?

    This question seems obvious, however, when I reviewing the IEC 60335-1 safety standard, I found that it define electronic component as:


    Inside the resistor, it is not vacuum, gas nor...
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    Closed: Re: Simulation for Micro-controller algorithm

    Yes the device is embedded inside the product.
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    Closed: Simulation for Micro-controller algorithm

    I am developing a project which is related to detection of the hand movement when the users are using a product. In the device there is micro-controller and a 6-DOF IMU (accelerometer and gyroscope)...
  14. Closed: Temperature compensation for Accelerometer and Gyroscope

    Again, I could not found a suitable category for this question in this forum...so I asked here.

    I am working on a project which use an 6-DOF IMU (Accelerometer and Gyroscope), that is the ST...
  15. Closed: How to measure orientation with IMU sensor on handheld product

    First I am not sure if this question is properly to be asked in this category, I am sorry if it is not.

    I am working on a project which use an IMU (accelerometer + gyroscope) sensor to detect the...
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    Closed: Re: Diode as Transient Suppressor

    I have tested the circuit with the Surge Test today. I found that both the M4 and the BYG10G work. However, having talked with the engineers, I have to clarify that there is a fuse and a MOV located...
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    Closed: Diode as Transient Suppressor

    I am working on a circuit which failed the EMC Surge Transient Immunity Test (2kV level). The working voltage is 240Vac.

    Someone suggested to add two back to back diodes across the Live and...
  18. Closed: Boost Converter Problem with Vibration Motor

    I have a AC/DC boost converter circuit which is implemented on a massager with the main loading is a 3.6V vibration motor.

    When I switch on the massager the first time it has no problem. Then I...
  19. Closed: Amplifier Circuit for Thermopile with Thermistor for Cold-junction compensation

    I would like to build a circuit for reading temperature from a thermopile temperature sensor. I found this application reference for the circuit (page 6, Single power supply type with thermistor)....
  20. Closed: How to calculate temperature resistance for Ni-RTD?

    I would like to build a circuit to read the signal from a thermopile temperature sensor which has build-in RTD temperature sensor for cold-junction compensation. The datasheet of the sensor is here....
  21. Closed: Re: Creepage and clearance of through hole resistor

    Thank you for all your help and sorry that I come back to this thread late. Actually in my personal opinion, this PCB design is inadequate obviously. However as I need to convince other to change the...
  22. Closed: Creepage and clearance of through hole resistor

    Recently I found a resistor broken on a PCB. It is a MOF type 1/2W through hole resistor. I found that the resistor is directly placing (touching) on a PCB Live trace and I know that the potential...
  23. Closed: Re: How to control mist rate in ultrasonic piezo mist generator?

    I am not complaining this antomizer, I know it meet the spec., To clarify the two questions:

    1. How can I control the mist rate dynamically for a general ultrasonic type piezo mist generator (not...
  24. Closed: How to control mist rate in ultrasonic piezo mist generator?

    I would like to make a ultraonic type piezo mist generator which I can control (or change) the output mist rate.

    For that I bought a Grove Water Atomizer to test.
    I can generate the mist, but...
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    Closed: TRIAC phase control with P.I.D. for PTC heater

    I have used TRIAC phase control with P.I.D. method to control the output power for wire type heating element. I would like to ask is there any concern if I use the same method to control PTC type...
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