These are my Top circuits published in Electronics for You Magazine from 2003 to 2010
- MIDNIGHT SECURITY LIGHT FEB 09
- stress meter
- AQUARIUM PROBE
- Circuit Ideas–EFY Dec 09
- CLOCK TIMER
- friendly charger for mobile phone
- LAPTOP PROTECTOR
- light fence
- MOBILE BUG
- MOBILE SHIELD
- NIGHT ALERT-NOV-08
- SECRET BELL
- SEISMIC SENSOR
- SKIN RESPONSE METER –
- Skin Response Meter- Viva Questions
- STABILIZED POWER SUPPLY
- MINI UPS SYSTEM
- PYROELECTRIC FIRE ALARM
- ANTI-BAG SNATCHING ALARM
- CHILDS LAMP
- Night-lamp
- highway-signal
- CURRENT SENSOR
- FRONT DOOR GUARD
- FUEL RESERVE INDICATOR FOR VEHICLES
- LEAD ACID BATTERY CHARGER
- MAT SWITCH
- MOBILE CELL PHONE CHARGER
- NON CONTACT POWER MONITOR
- PICNIC LAMP
- Remote operated Master switch
- SHADOW ALARM
- SHUTTER GUARD
- Automatic Bathroom Light
- Pencell charge Indicator
- Revive Your Precious Melodies
I read your books and circuit diagram l like
feature technology in establition service
Thank you
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.
thanks for da works Mohankumar
can i get pcb layout of secret bell
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
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
iam mechanical engineer. iam interested learning electronic.how to built this type of circuts. please help me.
sir please can you tell me the connections of lpg gas detector ….
plz mail the abstract to my gmail-dheeravathbaby@gmail.com…if at all it is possible mail me the video regarding the lpg gas detector….
thankyou sir….
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……………..
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
Hello Lekshmi
Blinking LED indicates that the circuit is working. I think there is mistake in the pin connection of UM 66. First pin ( facing side) is 3, then 2 and 1
please tell components cost of dual mode batterycharger and where it is available
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.
Hello
Give your Email ID and mention which Fig. you want
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.
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……………
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 .
You may see the Transformerless power supply design posted in the Blog for details. The changes required are AC capacitor should be 225K( 2.2uF) 600 V and Zener 5.1 V 1 W.
thank you…..and i want to learn the basics of circuit design and electronics. can you help me….
Hello You may see the ELECTRONICS HOBBYPAGE section for details D.Mohankumar
Remote operated Master switch circute diagram used IRX(TSOP) receiver ,what type type of sensor. thanks.
TSOP 1738 is the commonly used IR sensor module in TV and VCD player. To see details search in the blog for TSOP 1738 design or Photomodules.
thank you very much Mr.Mohankumar.
Hi Sir,
Where can i get PIR sensor module.
Thanks
pramod
PIR sensor is available in most places and costs Rs.350-500
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.
Sir, I want to try stress meter but i didn’t find touch pads do u have any idea where can i find and buy them
Regards
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
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.
Thank you sir,it’s working now. thank you again for your kind support.
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]
sir,
which one is better between mobile detector or skin response meter
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.
sir, plz send your personal knowledge and idea about skin response meter circuit; what is vu meter.
Just see the MOST USED CIRCUITS page. All matters regarding the Skin response Meter are available there.