| | | | |
 |  |  |  |
| |||||||
| Notices |
| Electronic Projects A collection of small electronic circuits and projects you can build. |
 |
| | Thread Tools | Display Modes |
27th December 2002, 03:27 PM
| (permalink) |
| Super Moderator   |  10 Channel Light Bulb Sequencer Project Level: Intermediate Here is a simple 10 channel light bulb sequencer circuit which you can build up to decorate your house. OPERATION The circuit consists of 2 sections: 1) Oscillator: The oscillator is built around IC555 wired in astable mode. The frequency of this oscillator is around 1 Hz (or slightly less than that) which can be increased further by decreasing the value of potentiometer VR1. The oscillator frequency determines the speed of effect. Higher the frequency, higher will be the effect speed. 2) Sequencer circuit: The sequential lighting of bulbs is achieved using Jhonson Counter IC 4017 which has 10 decoded outputs. The output of 4017 increments by one on rising edge of each clock pulse from IC555. In the circuit the fifth output Q4 of 4017 is connected to its reset pin to reset the sequence after every four clock pulses. Here only four channels are shown but it can be extended upto 10 channels using all the outputs of 4017. In this case the reset need to be connected to Ground. For channels less than 10 the output one greater than required number of channels should be connected to reset pin to reset the cycle as soon as counter counts one greater than the required channels. The output of 4017 drives the base of NPN transistors (BC547) through 1k resistors. The LED in the collector loop of each transistor indicates the active channel. The emitter current of each transistor further drives the gate of Triacs (BT139) thereby turning them ON and supplying power to the lamp loads. Those who have 120V AC mains in their countries can also use this circuit without any changes. Many number of bulbs can be connected in parallel on each channel provided the maximum load on each channel does not exceed 3500W for 220V operation and 1760W for 110V operation. :arrow: NOTE: DO NOT TOUCH ANY COMPONENT OF THE CIRCUIT WHEN IT IS ACTIVE AS IT MAY BE AT A VERY HIGH POTENTIAL AND MAY PROVE FATAL. I DO NOT GIVE GURANTEE OF ANY KIND. EXPERIMENT AT YOUR OWN RISK. Feel free to give your feedback!
__________________ "There is no way to peace, peace is the way!" |
|  |
|
19th December 2004, 09:58 PM
| (permalink) |
| New Member | I don't see any optoisolat for your circuit.......it is ok?
__________________ life is so short, don\'t waste your time dude |
|
| |
|
20th December 2004, 02:40 AM
| (permalink) | |
| Experienced Member  | Quote:
| |
|
| |
|
23rd December 2004, 06:46 AM
| (permalink) |
| Super Moderator | Thanks Electromaster! It seems you saw this project 2 years after posting! :lol:
__________________ "There is no way to peace, peace is the way!" |
|
| |
|
23rd December 2004, 09:01 AM
| (permalink) |
| Administrator   | arrr!!! no now i remember you posting it!!! I just saw it back on top and I thought it was another...  ops: Memory must be slipping in my old age :wink: |
|
| |
|
23rd December 2004, 01:22 PM
| (permalink) |
| New Member | nice post thanks its useful for me i used some part of your circuit in another project thanks....  |
|
| |
|
6th March 2007, 04:42 AM
| (permalink) |
| New Member | thanks dsf |
|
| |
|
28th July 2007, 09:41 PM
| (permalink) |
| Experienced Member   | can i use t106m1 Can i replace the BT139 with T106M1 and which one is the better Thanks |
|
| |
|
28th July 2007, 11:35 PM
| (permalink) | |
| Super Moderator | Quote:
__________________ "There is no way to peace, peace is the way!" Last edited by kinjalgp; 28th July 2007 at 11:38 PM. | |
|
| |
|
24th December 2007, 02:37 AM
| (permalink) |
| New Member | switching the neut with the BT139 Is there a reason that you are switching the neut with the BT139? Can I switch the Hot? This project is just what to doctor ordered!! |
|
| |
|
24th December 2007, 03:19 AM
| (permalink) |
| Experienced Member | review the date first before reply another lesson for new member, like me. but i like this project. 
__________________ sorry for my english Language = river bridge = schematic Last edited by jumides; 24th December 2007 at 07:09 AM. |
|
| |
|
17th January 2008, 12:25 PM
| (permalink) |
| New Member |  query can u plz give te schematic diagram of ur project? |
|
| |
|
17th January 2008, 03:52 PM
| (permalink) | |
| Super Moderator | Quote:
__________________ "There is no way to peace, peace is the way!" | |
|
| |
|
18th January 2008, 05:27 AM
| (permalink) | |
| Experienced Member | Quote:
I see schematic, but what happen to 4017, if BT139 goes wrong(short circuit) ?.
__________________ sorry for my english Language = river bridge = schematic | |
|
| |
Linear Mode
