Showing posts with label flasher. Show all posts
Showing posts with label flasher. Show all posts
Wednesday, October 15, 2014
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:
Circuit Diagram:
Sunday, September 7, 2014
Lamp flasher circuit
This simple schema that can be used to flash incandescent lamps up to 10W power rating.The schema is ideal for making flashing beacons on automobiles and other applications like that.The schema is nothing but an astable multi vibrator based on Q1&Q2 ( BC557&BD139).The capacitor C1 is the main timing element which determines the flashing rate of the schema.The switch S1 can be used as an ON/OFF switch.
Notes.
* Power the schema from a 12 V battery or 12V DC power supply.
* Assemble the schema on a goood quality PCB or common board.
* A 12 v , 10W incandescent lamp can be used as the load.
* All capacitors must be rated 15V.
Sunday, August 31, 2014
Lamp flasher circuit
This simple schema that can be used to flash incandescent lamps up to 10W power rating.The schema is ideal for making flashing beacons on automobiles and other applications like that.The schema is nothing but an astable multi vibrator based on Q1&Q2 ( BC557&BD139).The capacitor C1 is the main timing element which determines the flashing rate of the schema.The switch S1 can be used as an ON/OFF switch.
Notes.
* Power the schema from a 12 V battery or 12V DC power supply.
* Assemble the schema on a goood quality PCB or common board.
* A 12 v , 10W incandescent lamp can be used as the load.
* All capacitors must be rated 15V.
Sunday, August 10, 2014
LED flasher with Transistor circuits Wiring diagram
These diagram only flash one or two LEDs. This is opposed to the light chaser diagram that can flash four or more. Of course, the simplest LED flasher is simply to use a flashing LED. The problem with that approach is you have no control over the flash rate, but it does have its use for eye catching displays for selling stuff. The diagram below give you that control, plus they can flash two LEDs alternately.
There are many possible applications for the diagram below, especially for kids, who love flashing lights. Heres some possible uses.
- Railroad crossing signal for model railroads.
- Safety blinkers for bicycles, etc.
- Fun stuff for Halloween, like making those plastic Jack-O-lanterns blink (try using ultraviolet LEDs here).
- Christmas decorations.
- Blinkers to locate items in the dark.
Transistor LED flasher
This schema has a lot going for it. For one thing, it only consists of two transistors, two capacitors and four resistors. That also means it consumes very little power. You can control the flash rate by changing the size of the 100k resistors (100k makes for a pretty slow rate). You can also control the duty cycle by using resistors of different values on the two sides. The 470 ohm resistors control the current through the LEDs. Normally you want to limit this to 20mA, but to conserve battery power, you may need to limit it even further. You can also connect several LEDs in series, instead of using only one for each side. With red LEDs (1 per side) and the values shown, the schema draws about 11mA. Heres what the actual schema looks like:
On this schema, the green wires connect to the LEDs, but you can mount them on the actual schema board for some applications. The picture is about twice actual size. Here is an example of the use of this schema:
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