Top Circuits


These are my Top circuits published in Electronics for You Magazine from 2003 to 2010

  1. MIDNIGHT SECURITY LIGHT FEB 09
  2. stress meter
  3. AQUARIUM PROBE
  4. Circuit Ideas–EFY Dec 09
  5. CLOCK TIMER
  6. friendly charger for mobile phone
  7. LAPTOP PROTECTOR
  8. light fence
  9. MOBILE BUG
  10. MOBILE SHIELD
  11. NIGHT ALERT-NOV-08
  12. SECRET BELL
  13. SEISMIC SENSOR
  14. SKIN RESPONSE METER –
  15. Skin Response Meter- Viva Questions
  16. STABILIZED POWER SUPPLY
  17. MINI UPS SYSTEM
  18. PYROELECTRIC FIRE ALARM
  19. ANTI-BAG SNATCHING ALARM
  20. CHILDS LAMP
  21. Night-lamp
  22. highway-signal
  23. CURRENT SENSOR
  24. FRONT DOOR GUARD
  25. FUEL RESERVE INDICATOR FOR VEHICLES
  26. LEAD ACID BATTERY CHARGER
  27. MAT SWITCH
  28. MOBILE CELL PHONE CHARGER
  29. NON CONTACT POWER MONITOR
  30. PICNIC LAMP
  31. Remote operated Master switch
  32. SHADOW ALARM
  33. SHUTTER GUARD
  34. Automatic Bathroom Light
  35. Pencell charge Indicator
  36. Revive Your Precious Melodies

38 responses to “Top Circuits

  1. Sir,
    Can you please give a circuit of a simple inverter which can be used for 12 volts 60-100 ah battery with safety arrangements. Load is only led lights, 80-100 watts(100va). Thank you.

  2. sir,plz give me full information about vu meter
    is it really possible to measure current upto 10pA?
    how much cost it will be take for vu meter in skin response meter

  3. sir,plz give me full information about vu meter
    is it really possible to measure current upto 10pA?
    how much cost it will be take for vu meter

  4. Sir i want the circuits based on Transistors and it should be application oriented if you have any that kind of circuit please let me know……………..

  5. Dear Sir,I tried the Secret bell circuit.But after puffing,there is no sound coming from speaker but the Led was blinking after a long time.what can i do sir

  6. Sir ,plz email me the circuits regarding the transformerless power supply that have been published in the “Electronics For You ” magazine november 2012 .I want to give a seminar on the topic,I badly require the same circuits .hope you will help me.

  7. Sir, can you please prepare a circuit of cellphone jammer(the other circuits uses MRF947 and it is not easily available)because jammers are useful in confidential areas.I have made your other circuits(light fence and mobile bug)they were my first two projects and was very useful.

  8. hello sir . D. Mohankar…….
    plz let me search an ELECTRONIC VIBRATION SENSOR ………it should have a sensitivity control (trim) and should just conduct when banged \ vibrated \ shaken \ oscillated
    OR can we make ourself using a piezo and opamp ? remember it should not generate any Ac signals which will disturb me required circuit …..SHOULD just conduct like a SWITCH
    THANK u VERY much in advance
    awaiting……………

  9. Dear mohan kumar sir,i seen your designed circuits, all are working fine but i need a transformer less power supply from the two different kind of Phase supplies, and the input supply is 210v – 450v / phase, out should be 5v / 100mA .

  10. Hello Bitsue
    Stress Meter . Touch pad is used to make electrical conductivity through the skin. You can use any conducting material like aluminum foil, small piece of copper or aluminium plate. You can try with the aluminium sheets present in old Floppy disc. Cut it to 3×3 cm size.If Soldering becomes difficult , make a hole in the plate with a needle and tie up the connecting wire and glue it firmly.

    • Hello Bitsue
      Touch pad is used to make electrical conductivity through the skin. You can use any conducting material like aluminum foil, small piece of copper or aluminium plate. You can try with the aluminium sheets present in old Floppy disc. Cut it to 3×3 cm size.If Soldering becomes difficult , make a hole in the plate with a needle and tie up the connecting wire and glue it firmly.

      • Hello sir. My group has chosen stress meter as our miniproject. can we use another amplifier instead of BC548

  11. Greetings,
    I am presently using LM3915/16 to drive a 10 LED bar graph module. I use 8 such circuits to display 8 channels of audio. I would like to use a single LCD (JHD162A or similar) to display all 8 channels. Need your advise & help.
    Thanks.
    Best regards.
    A.A.Mulla.

    • Dear Mulla
      You require an LCD driving circuit . Give the audio signals to the driver circuit. It is difficult to display all the 8 channels simultaneously with the single LCD circuit. For this, a micro controller based LCD driver circuit is necessary.

  12. Respected sir,
    I am sarthak rane,engineering 3rd year student. i making mobile phone charger as a mni project,but i am not able to charge my samsung mobile phone E2550,having battery rating mention as 3.7V 800mAh . i am using 4.7uf/63V instead 4.7uf/25V. when ever i connect my cell phone in off mode my LCD of phone keeps on blinking . i am using 9V battery as input instead of 12 V suply or 1.5*8 pen cells.i am referring your above listed 28th project MOBILE CELL PHONE CHARGER circuit link. Sir i need your kind help.
    Thank you
    Sarthak Rane
    [sarthak.rane@gmail.com]

    • Both are good circuits with different applications. Mobile bug detects unauthorized use of Mobile phone and Skin response Meter assess the stress level of human body.Both are easy to build.

  13. Pingback: TOP POSTS | Mohan

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