I created a 555 Adjustable Delay On Off Timer Circuit. This timer circuit is useful when you need to power On/Off any AC Appliances after a pre-defined duration. For example, you can use this circuit to automatically turn off a mobile charger after a certain period of time to avoid over charging, or you can turn on/off a light bulb after a certain period.

The time delay of this circuit can be adjusted by using various combinations of resistors and capacitors.

Here are the video and blog post links:

Video: https://www.youtube.com/watch?v=AB8XjBGvlPY

Blog: https://diy-projects4u.blogspot.com/2023/11/555-Adjustable-Delay-Timer.html

  • highinthemountains@alien.topBEnglish
    1·
    10 months ago

    I see that some 50 years later 555’s are still ticking along. I used a couple of them to flash the leds on a foam snowman I made for a Christmas display on the ship I was stationed on. The chips made it easier than building TTL timer circuits by hand.

  • silasmoeckel@alien.topBEnglish
    1·
    10 months ago

    555 are pretty old school we were doing this sort of thing in the 80’s.

    Considering the cost of a esp32 that can do this and much much more for as many devices you can have near it not really seeing the value here before learning 80’s EE.

  • rsachs57@alien.topBEnglish
    1·
    10 months ago

    I guess everything old becomes new again. I built one of my first DIY projects with a 555 back in the early '80s, a variable windshield wiper delay for my car. Back then you only got that feature on really expensive cars so it was way cool to have it in a '74 Volvo wagon.