How can I make a very small on-off latch circuit with a 555 timer - Page 1
Forum section: electronics / beginners

author: Astaldoath
author_rank: Contributor
timestamp: January 28, 2018, 10:09:57 pm
content: say something that can fit on the side or front of a 9v battery. Soon as i get better soldering iron and some good solder thats not lead free ICK, i wanna make what im calling Prison Flashlights lol. Im going to mount 8 high output leds on top of the 9v through a board, they will be connected to a 9v battery clip, then I wanna cut a piece of board and either side mount or something. The 555 latching circuit. I will either solder those 2 boards together if possible in like a right angle or use some form of resin or adhesive so the entire assembly can pop on and off a 9v battery turning it in to a cheap little flashlight. Does anyone know of a way I can make an extremely small 555 latching circuit though, right now on my breadboard its quite big.I was thinking a lot of the work could be done by soldering directly to the pins of the 555 for the wires that have to go from 2 to 6 or 4 to 8 (yes i know those arent the exact wires just giving an example), solder the resistors on in the right place and then run 2 wires out to the switch mounted somewhere convenient for pressing. Then i was thinking after I test it make sure its working before mounting the 555 on a board, fill in the wires that could short out with hot glue so nothing moves or touches. To cover that battery I was just gonna try to do a basic electrical tape wrapping on it. I could weave a hemp sleeve to go over the battery if i wanted (have to get a new hemp weaving book, lost mine) but i know i can relearn that easy.So if anyone has a good opinion about making a very small latching circuit please lemme know and help me out if ya can. Also im not set on using a 555 its just the smallest and most simple circuit i found for turning a push button in to an on/off switch.Thanks all

author: danadak
author_rank: Super Contributor
timestamp: January 28, 2018, 10:35:58 pm
content: http://www.555-timer-circuits.com/latch.htmlhttps://todbot.com/blog/2010/01/02/momentary-button-as-onoff-toggle-using-555/comment-page-2/Search archive.org for 555 info.Regards, Dana.

author: Astaldoath
author_rank: Contributor
timestamp: January 28, 2018, 11:53:41 pm
content: I have a working circuit i was wondering anyone knew of a more compact one, ill check those sites, thank you

author: BradC
author_rank: Super Contributor
timestamp: January 29, 2018, 12:23:59 am
content: You trying to make something like this ?

author: cowasaki
author_rank: Frequent Contributor
timestamp: January 29, 2018, 12:40:02 am
content: Quote from: BradC on January 29, 2018, 12:23:59 amWhy? 9v batteries do not have a particularly high power density!

author: tpowell1830
author_rank: Frequent Contributor
timestamp: January 29, 2018, 03:19:10 am
content: Here ya go..

author: Astaldoath
author_rank: Contributor
timestamp: January 29, 2018, 07:22:40 am
content: yeah actually, damn it someone beat me to it lol, mines gonna have 8 leds though, and they are gonna be blue and white XD, oh well i still wanna do it to prove i can and to learn and so i can give some away to friends