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Showing posts with label flasher. Show all posts

Thursday, April 11, 2013

Simple Solar Flasher

This Simple Solar Flasher circuit is a single transistor fly back (Joule Thief) circuit that features a third coil. With it, flash duration and brightness is much enhanced, without resorting to large value capacitors.

Circuit Diagram:

Sunday, March 24, 2013

Simplest Mains Operated LED Flasher Circuit Astable Multivibrator Circuit

The following mains operated LED flasher circuit which is actually an astable multivibrator circuit utilizes only a diac and resistor arrangement for implementing interesting wig wag flashing of two LEDs. The circuit was shared with me by Mr.Vineesh, who is one of the keen followers of this blog. I would like to present the email that was sent to me by Mr.Vineesh.

Dear sir,

hope you remember me. i am not an electronics engineer,working as manager in a company, dealing basically with Tool & Die Enggr ,but self studying electronics for past 12-13 years,and have designed and made many simple projects of my own. some of them are marketed too.

actually this entire ckt attached is not my idea. i have gone thru 230V blinking LED circuit in some sites. i just converted it to alternate blinking. ckt working fine for last 2-3 months continuously. (used green bright leds)

i know very well no need to explain the working of ckt. but just given 2 lines because if i am wrong in theory,you can correct me.practically crkt is working well.

while cap charging,led2, (series with cap) lights. DB3 get less than 30V while cap charging and does not conduct.after full charge of cap, diac conducts and led1( series to diac) lights,n cap discharge thru 1N 4007 ,that time LED2 light get dim ,which gives alternate blinking effect.

1.8K Resistor series to led1 is more than the requirement ,but given for matching the light intensity with LED2

all my ckts are drawn in note books, just selected one small ckt from that which is easy to draw in CAD & and convert pdf bcoz dont want to send shabby hand drawn drawings.

thanks& regards

vineesh

My Reply:

Dear Vineesh,

Your explanation is absolutely correct, and the circuit is also very good............ it can be well modified for ganpati, diwali, Christmas or for other similar decoration purposes. Good effort.

Thanks and Regards
Swagatam

Lamp Flasher Portable circuit

Here is a portable, high-power incandescent electric lamp flasher. It is basically a dual flasher (alternating blinker) that can handle two separate 230V AC loads (bulbs L1 and L2). The circuit is fully transistorised and battery-powered. The free-running oscillator circuit is realised using two low-power, low-noise transistors T1 and T2. One of the two transistors is always conducting, while the other is blocking.
Due to regular charging and discharging of capacitors C1 and C2, the two transistors alternate between conduction and non-conduction states. The collector of transistor T1 is connected to the base of driver transistor T4 through current-limiting resistor R5. Similarly, the collector of transistor T2 is connected to the base of driver transistor T3 through limiting resistor R6. These transistors are used to trigger Triac1 and Triac2 (each BT136) through optotriacs IC1 and IC2, respectively, and switch on the power supply to external loads L1 and L2.
IC1 and IC2 operate alternatively at a low frequency determined by the values of capacitors C1 and C2. The oscillator circuit built around transistors T1 and T2 generates low frequencies. When transistor T3 conducts, IC1 is enabled to ire Triac1 and bulb L1 glows. Similarly, when transistor T4 conducts, IC2 is enabled to ire Triac2 and bulb L2 glows. Connect the power supply line (L) of mains to bulbs L1 and L2, and neutral (N) to T1 terminals of Triac1 and Triac2.
You can also connect neutral (N) line of the external 230V mains supply to both loads (bulbs L1 and L2) as a common line and then route supply line (L) to respective loads (bulbs L1 and L2). The circuit works off only 3 volts. Since current consumption is fairly low, two AA-type cells are suficient to power the circuit. Assemble the circuit on a general-purpose PCB and enclose in a suitable plastic cabinet with integrated AA-size pen-light cell holder. Drill holes for mounting the ‘on’/‘off’ switch and power switching terminals. Also connect two bulb holders for bulbs L1 and L2.
EFY note:
* While assembling, testing or repairing, take care to avoid the lethal electric shock.
Author: EFY Mag
Read more:http://www.extremecircuits.net/2010/05/portable-lamp-flasher.html