Author Archive
Chandelier Dimmer
Many of the chandeliers have a pull chord switch. Now add a novelty to your chandelier and surprise the guests. Place a small wire down the lamps from this circuit and touch it once, they will come on dimly. Touch again they glow with medium brightness. Another touch drives them full. One more touch the [...]
Submit your Circuit
Thanks to all readers of EngineeringSlash,
We are giving an opportunity to all our readers to submit your circuits and circuit ideas and get them published under readers circuits along with your name . If you wish to send your cicuits mail to
lijogk@gmail.com
Include the following details :
1 .Circuit design
2. Description and any special notes
3. Your name
4. [...]
Morning Alarm for babies
Here is a pleasant wake up alarm for the babies. As the morning light breaks in, the alarm gently wakes up the baby with a soothing musical note. What a pleasing way to make the baby rise to the day!
As already described, LDR has a very high resistance in darkness, which falls low as the [...]
Telephone Light
Telephone rings in the dead of the night and you grope in darkness for the light switch or may be for the cordless handset. Here is ingenious circuit which makes a light bulb glow whenever the telephone rings.
This is a good application where mains are triggered by triac by the action of an opto-coupler. The [...]
Stitching Machine Motor Speed Control
Motor operated stitching machines have a series of carbon buttons in an enclosure operated by foot pedal. As the pressure on the foot pedal is increased or decreased by the foot, these buttons come close or move farther away, their resistance changes and hence the speed of the motor. Even though crude, it seemed to [...]
Electronic Lock
Here is an electronic code lock, which can be used as a door latch or key for ignition, etc. Operation is fairly tricky and there lies the beauty of the circuit. There are a number of switches, actually nine, which should be operated in a particular and owner – configured -sequence, or else the circuit [...]
Four Station Quiz
Here we have another Quiz circuit using a number of CMOS ICs. Now the number of contestants can be easily increased even though the present circuit shows only four. It uses a two input Quad AND gate (74HCT08), a four input Dual AND gate (74HCT21), a dual D flip flop (CD4013), and a 555. Truth [...]
1.5 Volt Tracking Transmitter
The current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is working you should see the LED flash quite fast. Take your FM radio and search for the low-beat ‘humbe-humbe-humbe-etc’ equal to the flash of the [...]
3 FM transmitter circuits
Presenting 3 FM transmitter circuits .
Lie detector circuit
Here’s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when [...]
