Raghav Laboratory

08/07/2015

Guys
A note for hobbyist...

Sry for image clarity.

And also frndz Plz share the page and support me.
Thnx

26/05/2015

Electronic Gambling Game..
A clever and fun filled gambling game where the LEDS glow randomly on each time touch plate is touched by the player.

Circuit description
The entire circuit is build and fabricated around CMOS IC CD4022 (CD4022). A touch plate is used as switch and connected to pin 14 and 15 through resistor R1 as shown in circuit diagram. When the player touch the touch plate the frequency of 50 Hz is obtained in this plate due to our body frequency which trigger the IC, which made all 8 LEDs glow. As the player remove their finger only one LED remain glow. The touch plate used in this circuit made as small as possible.



PARTS LIST
Resistors (all ¼-watt, ~+mn~ 5% Carbon)

R1 = 10 MΩ

R2 = 470 Ω

Semiconductor
IC1 = CD4022BE (octal counter / divider IC)

Miscellaneous
LED1 – LED8 = 8 LEDs

Touch plate

26/05/2015

SOLDERING IRON TEMPERATURE CONTROLLER.

Circuit Description of soldering iron temperature controller
The circuit of soldering temperature controller is designed and fabricated using DIAC and TRIAC with its corresponding passive components. The varying of temperature from zero to maximum is done by TRIAC where DIAC is used to control the TRIAC firing in both directions. The potentiometer used here is for setting the temperature of the soldering iron.

PARTS LIST
Resistors (all ¼-watt, ~+mn~ 5% Carbon)

R1 = 2.2 KΩ

VR1 = 100 KΩ

Capacitor
C1 = 0.1 µF/400V

DIAC1 = DB3

TRIAC1 = BT136

18/05/2015

This clever design uses 4 diodes in a bridge to produce a fixed voltage power supply capable of supplying 35mA. All diodes (every type of diode) are zener diodes. They all break down at a particular voltage. The fact is, a power diode breaks down at 100v or 400v and its zener characteristic is not useful. But if we put 2 zener diodes in a bridge with two ordinary power diodes, the bridge will break-down at the voltage of the zener. This is what we have done. If we use 18v zeners, the output will be 17v4. When the incoming voltage is positive at the top, the left zener provides 18v limit (and the left power-diode produces a drop of 0.6v). This allows the right zener to pass current just like a normal diode but the voltage available to it is just 18v. The output of the right zener is 17v4. The same with the other half-cycle.The current is limited by the value of the X2 capacitor and this is 7mA for each 100n when in full-wave (as per this circuit). We have 10 x 100n = 1u capacitance. Theoretically the circuit will supply 70mA but we found it will only deliver 35mA before the output drops. The capacitor should comply with X1 or X2 class. The 10R is a safety-fuse resistor.
The problem with this power supply is the "live" nature of the negative rail. When the power supply is connected as shown, the negative rail is 0.7v above neutral. If the mains is reversed, the negative rail is 340v (peak) above neutral and this will kill you as the current will flow through the diode and be lethal. You need to touch the negative rail (or the positive rail) and any earthed device such as a toaster to get killed. The only solution is the project being powered must be totally enclosed in a box with no outputs.

16/05/2015

FM transmitter uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an antenna length is less than 12 inches. Signals from the microphone in the fm transmitter is reinforced by Q1, Q2 with carrier frequency generator is determined by the C5 and L1. The frequency of the FM transmitter is in the range 80 MHz - 108 MHz. L1 can be made with as many as 24 wire wrap and 6 wrap.
This fm transmitter antenna is connected to the mid point of the antenna length L1 and preferably between 8-12 inches. FM Transmitter is only used for experiment and learning materials are not to be used for day-to-day, because the use of FM transmitter frequency regulated and protected by law may be understandable.

14/05/2015

Hello friends
This is admin of raghav Laboratory

I am re–establishing my lab again in new form.
From many days I was inactive in this page and couldn't post anything.
So friends Plz like the page and share the page so that your other electronics enthusiastic friends may like this page.

By the way I am in need of few volunteers friends who can post projects regularly along with me.

Plz inbox if you are really a electronic enthusiastic.

Thnx friends
Plz share

25/07/2014

1st image :- +5/-5 Volts at 500ma circuit
2nd image :- Short Circuit Protection for power supply

14/07/2014

http://www.youtube.com/channel/UCRYsE8yJHJcf5w6tOugFeuQ/feed


Watch Few Videos Here

02/07/2014

Do anyone need or have queries regarding the projects in which your indulged ?
Then please dnt hesitate to contact me and send me your queries in the website
http://raghavlaboratory.webs.com/contact

raghavlaboratory - Contact -

02/07/2014

And also soldering station.

02/07/2014

I am about to post a DC Power Supply unit with PCB layouts and cabinet design.

18/06/2014

This is a site to share thoughts and projects about electronics,RC airplanes and helicopters and also about technologies and design .