I know, I know. There are tons of LED blinkers out there on the internet. I have spend weeks searching for them already, but still doesn't found one matching my criteria.
I want to build simple "Internet box" ( see
The IT Crowd - Series 3 - Episode 4: The Internet )
But to learn something useful (some low-voltage stuff) for me, I want to drive it from one single 1.2~1.5 Volt battery (so I can use any AA / AAA NiHM accumulator and/or classic AA / AAA / C / D 1.5V battery). And of course, the longer battery life, the better. Red 1.8~2.3V LED will be absolutely fine, but some more universal scheme with blue 3.2V LED will be appreciated.
1.
I have found several designs, that just flash (LED is on for about 4ms with one flash per second), but I want do make something like 1 Hz ~ 1 second on / 1 second off. Accuracy is not important.
2.
I also found some schemes using LM3909 Oscillator IC, but that chip is not manufactured anymore.
3.
Then I found some M34 LED Flasher Chip, but I cannot found any supplier for it and the minimal voltage is 1.35V.
4.
Someone suggested an LT1073 DC-DC Converter, but what then ? Use an 555 timer ? Low-power micro-controller ? Which one ? Is there any possibility, that it will blink for at least a month from one AA / C or D type battery ?
Thanx for any advise.