I have a question about using a 555 timer as a flip-flop? Answered

I have it set up so that I get an out put signal that goes High for about 1/2 second, and then goes low for about 1.33 seconds. The problem is that the output is to go through 2 LEDs, the one is supposed to light when the signal goes high, and the other when it is low, since I have the other leg of each LED tied to ground or source respectively. IF you are really familiar with how LED's work, you probably see the problem I have already. When the signal goes high for the first time, the LED tied to ground, lights....and stays lit. The source provides current whether there is a signal out or not. Is there ANY way around this, without me having to scrap this and redesign it for a 556 ? NOTE: I've replaced the stock pic with a partial schematic of my circuit

Question by Goodhart   |  last reply


How can I replace a MOSFET with a common transistor? Answered

This is a flip-flop circuit that I want to use for a project. It calls for any N-Channel MOSFET, but I don't have one. Is it possible to replace it with a transistor, such as a 2N3904?

Question by 1up   |  last reply


Technology of the Tube Screamer

Some time a circuit Screams wrong as this foot switch flipflop I can see the arrangement if the design wanted independent control but that would allow a lack of signal.

Topic by iceng   |  last reply


tpr outsole better grip or rubber outsole?

Wnt tok now rupper outole has better grip or and slip resistance than tpr outsole.prefering flipflops as i has to walk  in tiles which are sometimes water spread on it and there is lot of dnger in that.

Question by saketsunny   |  last reply


Transforming a upright freezer into a super airconditioner? Answered

 I'm getting a slightly broken, upright freezer from craigslist (only the seal is broke, so air's leaking out the door frame) and I was wondering if there is any way to make it into a slightly over sized air conditioner.  Living in Texas, it's kinda hot so I dont mind if its chilly (im the kind of guy that wears flipflops to North Carolina in the Winter on the Mountains). Im going to be putting it in a mobile home that will be internally demolished and transformed into a recording studio. It shall have its own little 'space' over in the corner. It would be great to cool down the heavy old-ish recording equipment and the computer I will house in the 'tech room'! Could I just cut a hole in the freezer and run a duct from it to the trailer? Would it put too much condensation? Thanks!  *Big, upright freezer around the size of a normal refridgerator*

Question by darkclaw42   |  last reply


Voice changers

I know voice changers have been done, but theres only 2 instructables for some rather simple changers and other forum queries are quite old. What I'm looking for is a diy, real time voice changer circuit that can alter pitch and modulation, preferably with pots for fine tuning rather than presets, hopefully without the tinny sound I hear from the majority of samples I've listened to. An amped output with volume control would be cool too to overpower the users voice a bit easier. I'm looking for an output akin to this as an ideal. https://www.youtube.com/watch?v=Dqr5K0K4wL4 I'm no stranger to micro electronics, I can read codes and, with a little review, understand gates and ICs but still have no clue how to design my own circuits to do more than flipflop and turn things on and off. Any ideas ? Kits, DIY plans etc ? Simple and portable is better, want to incorporate it into a costume.

Topic by Silence   |  last reply