Suggest a Topic to Publish & Win a 8GB Pen Drive

An open letter to all readers of CircuitsToday.

Can you suggest a topic idea to publish in CircuitsToday ?

You can suggest any topic related to Electronics.

You can put in your suggestions as comments below.

Note: If you dont see comment option Follow this link :

We will work on your topic ideas and make it live as soon as possible. 🙂

Details of Prize:

1. We are giving away only 1 Pen Drive to one lucky fellow selected randomly from all the people who suggest an idea. (Note: We will filter ideas that are out off topic, irrelevant, not related to Electronics etc.)

2. We will buy the Pen Drive from an Online Shopping Website and deliver it to  the winners address directly. (If direct delivery is not possible, we will deliver it to an address of winners choice).

3. Any one can participate in this idea suggestion and hold a chance to Win Pen Drive. (No age bar, No country bar, Nothing! Its open to all 🙂 )

4. If Kingston is not available at the time, we will buy from another company with same standards.

5. Date of Draw: December-25-2010 (subject to change with notice before 2 days)

Show Comments

313 thoughts on “Suggest a Topic to Publish & Win a 8GB Pen Drive

  1. taher

    why don’t we create a circuit that can absorb sound and convert to electrical energy

  2. T. Sambasiva Rao

    Dear Sirs,

    Can you please publish a circuit that can connect pen drive (to play MP3 songs)to a car amplifier either directly or through FM modulation? I have searched all your circuits for this, but in vain. I have previously requested for publishing a power supply circuit and so far I did not see any. I would also like to know how much time would it take to publish a circuit after the request is made.


  3. Audiofreak26

    Hello Sir,
    Can anyone guide me through the working principle of a Audio DSP (Digital Signal Processor)circuit. How the audio signal is actually divided into 6 different tracks through different components to make it specific for 5.1 DSP operations which makes it a useful for a 5.1 Home Theatre system and same for 7.1, 7.2, 9.1, 9.2 Home theatre setups.

    I will be really helpful if you can provide a basic circuit with positive and negative sides.

    Thanks to all in advance…….


  4. Aniket

    I am trying to make my house water pump/motor to be automated by 24 hrs clock with simple non controller (805* or else ) base automated circuits is there any IC or circuit ( for 24 hrs & programmable delay to be change )

  5. Charlette Langolf

    hello there, from time to time when I first check out this website I get immediately redirected to a different page which would seem very weird. You might want to have a look at why this is going on! Thanks

  6. Chetan P. Patil

    A circuit in headlights in four weelers vehicles which changes it’s light density with change in light density which out side on the vehicle using light dimmer circuit.

  7. T. Sambasiva Rao

    Please publish a circuit that can provide 12V @ 3/5A supply direct from the Mains without any transformer.

  8. rohin

    circuitstoday is doing a nice job.i want to help those who are novice in electronics but interested.i made 100w sub woofer amp layout plz tell me how you can published it.thankyou

  9. J.K.Srinivasan

    I suggest these to help technician.
    1.dvd player repairing,2.sine wave ups circuits&servicing etc.

  10. T. Sambasiva Rao

    With the present rates of Copper and Iron, the cost of transformers has gone up steeply. I would, therefore, suggest that, even for the audio amplifiers, there should be power supply circuits of different voltages and current ratings that would work direct from the mains supply of 230V AC and without any transformer. I am suggesting this because I did not find these anywhere.

    In any case, I would like to have one simple and rugged power supply circuit of 12V @5A without any transformer for my personal use.


    All thses in Assembly language I SUJEST THAT U GUYES SHOULD WRITE ON HOW ADC0804 CAN BE INTERFACED WITH AT89C52 TO FORM DIGITAL VOLTMETER THAT wil replace the ANALOG VOLTAGE USE IN INVERTER. ALSO LET IT BE THE TYPE THAT MAKE USE OF THREE 7-SEVEN DISPLAY (i.e 220V). Digital code lock, How to interface MT8870 with 8051 IC and How to use it to switch car off by using handset as the remote control.


    I SUJEST THAT U GUYES SHOULD WRITE ON HOW ADC0804 CAN BE INTERFACED WITH AT89C52 TO FORM DIGITAL VOLTMETER THAT wil replace the ANALOG VOLTAGE USE IN INVERTER. ALSO LET IT BE THE TYPE THAT MAKE USE OF THREE 7-SEVEN DISPLAY (i.e 220V). Digital code lock, How to interface MT8870 with 8051 IC and How to use it to switch car off by using handset as the remote control.

  13. Pablo Picaso

    SOLAR charger for batteries in series of lithium 4.2 + 4.2 = 8, 4v + 3, 7v = 12, 1V–of 3800mA each.
    In two series 12, 1v 7600mA
    Cargador SOLAR para pilas en serie de litio 4,2+ 4,2= 8,4v + 3,7v =12,1V —-de 3800mA cada una.
    En dos series 12,1v 7600mA

  14. Pablo Picaso

    Solar charger for batteries in lithium series 4.2 4,28,4v 3 .7V 12, 1v–of 3800mA each.
    In two series 12, 1v 7600mA
    Cargador solar, para pilas en serie de litio 4,2 4,28,4v 3,7v 12,1v —-de 3800mA cada una.
    En dos series 12,1v 7600mA

  15. Romeo Nnaemeka

    I need a 12 volts battery operated soldering iron that will be very durable and still retains battery life for about 10 hours. This can help us solder our electronic components in the absence of mains power supply, generator, inverter and any one of their kind.

  16. Sparsh

    I need a multiple used portable small player which can be used as a MP3 player and also video and in that we can connect to the TV to watch a video into TV and the player size must be very small and also can be used in 5.1 or more channel which can be support up-to the 32GB and with a small display and a spy camera it must be 3.0 MP and also it can be used by an remote and with that an mini amplifier which can convert 250V into 5-12V and it battery must be work up-to 10-12 HOUR.

  17. sneha

    i need a circuit that recharge the battery automatically when it falls below a certain level say 50% by either amplifying the available voltage or using electron multiplier ,voltage doubler circuit ,without using AC supply again. this can be applied in our laptop or mobilephone so that there is no need of carrying charger everytime.

  18. Jason

    Interfacing alphanumeric LCD with DSP microprocessor including software and hardware interface and source codes

  19. Manjunath

    Hello. Sir pls give ckt diagram for transformer vtg indicator with 7 segment disply

  20. Mayank G. Sakariya

    when student in college ..they switch off computers without complete shut down process…so computer will damages ….
    so,, my idea is ” make a ckt in which it indicate when student switch off pc directly” ….
    so that time student got punishment …and that’s way student got good habit ………….

    it’s my idea ..i have not any ckt related to it…

    thanx byeee..

  21. Milaan panda

    ****publish a genertor circuits…using dc motor…&..this will be use 4 battry charging.

  22. Ajinkya Dixit (Dexter)

    Please Publish simple “Line Follower Robot” & “Obstacle Avoider Robot” & “Fire Fighter Robot” with circuit diagrams , source codes, Etc. It’s really useful for Robotics beginners….!!!

  23. Anto Koshy T. Panicker

    Phone call Charges are going up. So we can publish a circuit diagram of a devise, working with radio signals which can be used as a mobile walkie talkie or a personal phone with long range. So many people are looking for this result in so many search engines long time. This will be very helpful for them.

  24. Finbarr

    I reamain ernestly gr8full….. One thing disturbs me, which I will get over it now. I suggest a circuit diagram for a traffic-ligth control system…….. THANKS

  25. Anupam Mishra

    Request you to publish a solid state Converter (220ac to 110ac.
    Load should be universal ( Inductive,resestive or reactive).
    I want to use load as Hand mixi 110VAC/220W on 220VAC.

  26. Carl Sanderson

    Suggested Topic: Electronic Circuit Simulation.

    I suggest that you write an article about CircuitLogix laboratory simulation software. It is a terrific product and has versions for both students and professionals. The URL for the software is

    Best regards,



    Hi, This is Harsh Arora, want to suggest a topic to publish “Cell Tower Radiation Hazards and Solutions”.

    India Population –
    1.2 billion

    Mobile Towers –
    4.5 lakh

    Mobile subscribers –
    800+ Million

    Microwave radiation effects are classified as:



    The current exposure safety standards are mainly based on the thermal effects, which are inadequate.

    Non-thermal effects are several times more
    harmful than thermal effects.

    Microwave Heating Concept

    4.2 KW (4200 W) of microwave power raises temperature of 1 Litre of water by 10C in 1 second.

    In energy absorption term, 4.2 KW-sec microwave
    energy will increase the temperature of 1 Litre by 10C. For example, in a microwave oven, temperature of one cup of water increases from 300C to 1000C in approx.
    70 seconds with 500W of microwave power.

    With 1W power (same as output power of cell phones), temp. will increase by 10C in 500 seconds.

    Cell Phone – Ear Warming?

    Have you ever noticed warm sensation in ear after using mobile phone for a long time?

    Temp. of ear lobes increases by 10C when cell phone is used for approx. 20 minutes.

    Warm sensation/pain > tinnitus > irreversible hearing loss

    All these effects lead to Ear Tumor

    Tinnitus or “Ringxiety”- sensation of cell phone ring

    SAR and Cell phone use time limit

    A Cell phone transmits
    1 to 2 Watts of power

    SAR (Specific absorption rate) – Rate at which radiation is absorbed by human body, measured in watts per kg (W/kg).

    In USA, max. SAR limit for cell phones is 1.6W/Kg which is for
    6 minutes. It has a safety margin of 3 to 4, so a person should not use cell phone for more than 18 to 24 minutes per day.
    This information is not given to people in India.

    Warning from Blackberry

    Results of Re-evaluation of Interphone Study

    INTERPHONE – WHO -10 years, 13 countries, largest (5,117 brain tumor cases), $25 million dollars to evaluate risk on brain tumors. Conclusion – no overall A risk, but suggesBons of A glioma – heavy users & ipsilateral exposures

    Re-evaluation – Risk underestimated by at least 25%

    For every 100 hours of use -26% A risk of meningioma
    Initial 24% risk of glioma Ato 55% over 10 years- regular users are taken as people who use it for 2hrs/month.
    Doubled – quadrupled brain tumor risk – heavy users
    (1/2 hour/day) over 8 to 10 years.

    Cell Tower Radiation

    Antennas on Cell tower transmit in the frequency
    range of:

    • 869 – 890 MHz (CDMA)
    • 935 – 960 MHz (GSM900)
    • 1805 – 1880 MHz (GSM1800)
    • 2110 – 2170 MHz (3G)

    Cell Towers Installed in Mumbai

    Radiation Pattern of Antenna

    Radiation Pattern of a Cell Tower Antenna

    Propagation of “main beam“ from antenna mounted on a tower or roof top

    People living within 50 to 300 meter radius are in
    the high radiation zone (dark blue) and are more prone to ill-effects of electromagnetic radiation

    Radiation Pattern of a Cell Tower Antenna
    Six cancer cases in consecutive floors (5th, 6th, 7th, 8th and 10th) directly facing and at similar height as the mobile phone towers of four telecom companies placed on the roof of opposite building.

    Power Density Calculations

    Power density Pd at a distance R is given by

    P =  Pt

    × Gt 

    d  4πR 2 


    Pt = Transmitter power in Watts
    Gt = Gain of transmitting antenna
    R = Distance from the antenna in meters

    Power Density at distance from cell tower

    For Pt = 20 W, Gt = 17 dB = 50

    Distance R




    1 79.6 79,600,000

    3 8.84 8,840,000

    5 3.18 3,180,000

    10 0.796 796,000

    50 0.0318 31,800

    100 0.008 7,960

    500 0.000318 318

    Above values are for a single carrier and a single operator.

    Power Density for multiple carriers and operators

    For Pt = 20 W, Gt = 17 dB = 50
    No. of carriers = 5, No. of operators = 3

    Distance R




    1 1194.0 1194,000,000

    3 126.0 126,000,000

    5 47.7 47,700,000

    10 11.94 11,940,000

    50 0.477 477,000

    100 0.1194 119,400

    500 0.00477 4,770

    For 5 carriers and 3 operators on the same roof top or tower, radiation level is extremely high.

  28. Er. Sudhir Tripathi ( High Efficiency car using electric power )

    Lowest cost Eco-Friendly electric car with Superb Efficiency.

    Hi everybody, It’s my first posting at this site, I am today just giving an idea about a system which can be used to increase the efficiency of a system.

    i am discussing about the electric engine with maximum efficiency. As we know that energy can neither be created nor be destroyed. hence we can generate energy only by transforming one form of energy into other or mass into energy like: in generators we burn diesel to convert it into heat energy then heat into mechanical motion then mechanical into electrical energy. But the amount of electricity produced by the generator will be always equal to the amount of heat energy produced by burning the diesel or petrol. But however, we can do one thing i.e. increase the efficiency of the system so as to get maximum conversion of energy with minimum loss.
    similarly we can make an electric engine using two batteries of 24 V, an electric traction motor as used in rail engines, Micro-controller as per requirement, a gear system with reduced friction and delay and one alternator arrangement, a battery charging and supply regulating unit.

    arrangement is like:- we program our controller such that it checks which of the two batteries have more power level n selects the higher one to run our motor that drives the vehicle then second one is connected to the charging unit by controller in default.

    The shaft connection and gear is connected as in traditional car. but the alternator is connected to the wheel shaft using a gear system. then this gear connecting alternator is controlled by controller internally as :- when the car attains a speed of 45 kmph then the gear is connected to the alternator n alternator starts moving at a gradual speed slow at starting then changing gear with speed of alternator. then the electricity generated by the alternator is used to charge the second battery which is at low power. This way we can do a recycling of energy and thus with a very few loss the second battery gets charged to suppose 98 % then controller switches the battery at run time without need of stopping the car and uses the second battery to run and first is charged. this time with loss of some energy, the first one gets charged as say 90% and goes on. as we know that the amount of energy given by first battery which is running car is added with the energy of momentum of the car at speed of 45-60 kmph. as we are just shifting the ideal point of operation the system which is at 70 kmph. this 10 kmph difference of speed is the key energy which charges the battery. Hence we have achieved 90% efficiency following the LAW OF CONSERVATION OF ENERGY.

    Thank You… Hope you all find it help full as it is just an idea now and i am working over it. This can be proved as solution of the growing energy problems.

  29. Rehab

    Hi there ,
    i have a flash drive 8gb , if fall in water , when i dry it and connect it to my lap top , it could read the content but when i tried to copy it , it stopped in the middle of the operation
    after a while , and till now , when i connect it i got a message in the begining say that i can’t open it before i format it , and when i press formatting , it told me that it’s unable to format
    then when i try to open it i got ( G:\ not accessible )

    Please i need the data on it by any means

    Can anyone tell me any way to solve this problem and got my data back , even if i lose the flash memory

    And please reply me via e-mail , as it’s hard to reach this website again to check reply

  30. lalit

    please publish the circuit diagram of heat sensor which store the heat of any person (as a current)and then automatically detect that person with his/her heat ,because we know each person liberate different heat.

  31. Devi

    This website is very helpful to me..tanx for the website…and my idea: “Charging a cell phone or other devices using water”…i want to know the working and full details of that……kindly put article for tat..:)

  32. dariyappa bevinagidad

    with the help of electronics can we possible to see man to whom we will call that person in front of us only?
    your all topics related to electronics are fantastic but please help me to try to invent some device about mine above mentioned question…plz plz plz………………………
    once again thanks for all electronics notes…

  33. sliblyjoyclal

    An rf isolator is a two-port ferromagnetic unrevealed device which is toughened to protect other RF components from immoderate signal reflection.
    Isolators are average situation in laboratory applications to take a device subservient to test (DUT) from reactive signal sources.
    An RF circulator is a three-port ferromagnetic passive trade mark hand-me-down to restrain the direction of signal plenty in a bound and is a dialect right noticeable, low-cost surrogate to expensive opening duplexers in found site and in-building grasp networks. Examples of both applications will-power be covered later in this article.

    To the hang of how these components control the signal move, contemplate of a cup of water into which you place a spoon and stir in a clockwise motion.
    If you sprinkle some fleck into the cup and carry on with to stir, you wishes make note of that the pepper very likely follows the circular going of the water.
    You can also get the drift that it would be impossible on the pepper to stir up in a counterclockwise leadership because the not ring true motion is just too strong.
    The interaction of the irresistible field to the ferrite substantial secret isolators and circulators creates alluring fields alike resemble to the saturate ripple in the cup.
    The rotary field is very stout and command cause any RF/microwave signals in the frequency group of consideration at one port to obey the magnetic go to the adjacent harbour and not in the inconsistent direction.

    An substantial contemplation when specifying an isolator or circulator is to insure the stratagem has adequate isolation exchange for your presupposed application. Isolation is a unit of volume (in dB) that states the divorce of signal levels on adjacent ports of a device. The greater the isolation value, the less interference from a signal on undivided haven is immediate at the other. The amount of isolation is as the crow flies pompous near the VSWR presented at anchorage 3 of the isolator. If the be equivalent to on seaport 3 is badly off, you can expected isolation underneath 10 dB, but if the union is improved to 1.10:1 away using a passable wind-up strategy in the circuit, then the isolation would improve to over 20 dB.
    Another weighty kind-heartedness when specifying circulators and isolators is to confirm the thingumajig has minimal insertion extinction when inserted in a transmission path. Principally, the insertion breakdown of a circulator/isolator (or any microwave device for the purpose that essentials) becomes more significant at higher frequency, namely because reduction increases with frequency and higher frequency power sources are considerably more expensive. Accordingly, the criteria of low insertion destruction intention ward irreplaceable power from being wasted.
    As described earlier, a normal use instead of a circulator is as an low-priced duplexer (a transmitter and receiver sharing inseparable antenna). Figure 2 shows that when the transmitter sends a signal, the generate goes shortly to the antenna harbour and is lonely from the receiver. Good isolation is indication to guarantee that a high-power transmitter produce signal does not get to the receiver front object as is governed by the benefit breakdown of the antenna. In this configuration, all signals from the antenna communicate with unqualified to the receiver and not the transmitter because of the circular signal flow (keep in mind the cup of water).
    A dual junction isolator is effectively two isolators in series but contained in a separate package. Typical isolation discharge can range from 40 to 50 dB with this type of design.

  34. Pablo Picaso

    Make source of variable voltage supply, to another controlled output of 220v to control the welder.Two outputs, 0-24v Dc 3A, and the other 0-220V for soldering iron 40W
    Hacer fuente de alimentación variable de tensión, con otra salida controlada de 220v para controlar el soldador.
    Dos salidas, 0-24v Dc 3A,y otra de 0-220v para soldador 40W
    Barcelona España Spein

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