I was getting Bored, so I started prototyping "Pummers". Pummers are little LED Flashers commonly powered by Solar Light. I designed this one to run on a battery at roughly a 91.5% Duty Cycle. 555(1) Creates the 91% Duty Cycle (around 1 hertz) while 555(2) Inverts it, so that it is now a 9% Duty Cycle. The schematic is attached and was made With Express PCB (fun and easy software).
The 3300uf capacitor makes the LED fade in, giving the Pummer Effect.
If you use a 7555 you can operate your Pummer at 2.4V. I did not put a reisistor on the LED, because I intended it to be a White or a Blue SuperBright. It will appear to be VERY Bright
If you have any problems, questions, or comments, Post. Remember, there is a thin line between constructive critism and insult.
I will post Pics of the finished Pummer soon.
(THIS IS ALSO GOING ON MY WEBSITE FOR YOUR PLEASURE )
Oh yeah thats right, I forgot that the 555 can sink reverse (inverts the doody cycle). Oh well, I will still build it as shown in the schemmy. Even though it adds a level of complexity, it is good for demonstrating the 555's capability.
I updated the schemmy and included a pic of the final thing.
The reason I include just one 555 in the 91% duty cycle, was because the 9% duty cycle was not enough to charge the Capacitor of any large amount, and then the Cap would just discharge, therefore it would not work. With the updated version, it looks and works much better, making it easier.
The output current of a 555 is over 200mA. It will destroy an ordinary LED that has a max allowed current of only 30ma.
But maybe your battery is old and doesn't have enough voltage to fry a 3.5V white or blue LED.
I really don't understand the purpose of C2 (3300uF) between pin 3 of the 555 and ground. If you want a fade effect put a resistor in series with pin 3 and leave C2 across the LED.
I updated the schemmy and included a pic of the final thing.
The reason I include just one 555 in the 91% duty cycle, was because the 9% duty cycle was not enough to charge the Capacitor of any large amount, and then the Cap would just discharge, therefore it would not work. With the updated version, it looks and works much better, making it easier.