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    PIR D203S circuit op amp circuit doubt

    Hi all, I am planning to do a PIR motion sensor with D203S. I have gone through the application circuit they provided..I didn't get why they connected R4 and C4 to the inverting input of the first opamp. In my observation they have done transimpedance amplifier...can anybody tell the...
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    Battery monitoring circuit with PMOSFET

    hi all, I have a battery monitoring circuit with PMOS irlml6402 and a voltage divider circuit.I am trying to read the battery voltage with voltage divider. But MOSFET is not turning off when gate input in about 3.3V. Please give your valuable suggestions. I have attached the circuit. Thanks...
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    MQ2 and 3.3v controller adc

    hi all, I need to connect mq2 gas sensor with 3.3v microcontroller...but the sensor work in 5v ....I think I cannot use voltage divider at the output of the sensor because the RL is involved in the calculation of PPM.....Please give some suggestion to do the same... Thanks & Regards Lok
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    timer2 asyncronous mode

    hi all, I am working with atmega256rfr2 and I stuck with some portion of the program which is like asynchronous operation of the chip....I have connected 32.768 crystal between tosc1 and tosc2 pin but its not works for me ..please give your suggestion to get out from this problem ... this...
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    MONOPOLE antenna (wire)

    HI, I have some zigbee module and we need to connect a wire antenna on it .......it has a 50 ohm impedance line in the pcb coming from a balun ...........i need to connect the antenna(wire type) at the edge of microstrip line(50 ohm @ 2.4Ghz)......how can i add a wire type antenna to...
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    RF power amplifier testing

    hi, what equipment are needed for testing the output power of RF power amplifier? and how to check radiated power of an antenna?? Regards, lok.
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    [SOLVED] multi-output flyback coverter output voltgae variation

    Hi all, I have a tny266 flyback converter with two output secondary (4 turns each)....I need to get +5v and -5v ....Here we are taking a feedback with an opto isolator only from +5v ..After building the whole circuit Iam getting +5v and -7v...what would be the problem ??...I turned the...
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    voltage sensig circuit for energy meter

    Hai all, Iam started to doing an energy meter with ade7763 .....In the application note of the ade7763; they recommend a circuit for voltage sensing...which is a resistor divider network; one end of the divider network is connected to live(phase) and the other is connected to ground/common..It...
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    Power factor of ceiling fan

    hai all, I think ceiling fan is inductive load; but when I measure the power factor of the fan, it shows 0.99. I need to know is it a true reading...? if it is not true, is there any possibility of reading power factor 0.99 if they include PFC circuit in the regulator circuit....?
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    bad behaviour of triac

    Hi all, I need to control electrical devices(like bulb,fan...etc) in home with Triac (BT136). I got a circuit from net when control pin from microcontroller is low the device should be off right? but in my case when I switch on the main switch for the bulb without turn on it by...
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    [General] How to know crystal is in working condition

    hi all, Iam using atmega8 for my project.After burning my program I placed it in my circuit board. But not worked properly. I think my crystal is not working.How can I check it without desoldering from my board.

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