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The online 555 calculators that I tried, using 50K value for R2 (VR1), gives frequency of 1.31Hz and 54% duty cycle. I only tried two of them, but with the same results. Is it possible that they are both wrong?
The text that accompanied the schematic states, "The timer NE555 (IC1) is wired as...
OK, I'm a little embarrassed to admit this, but.......I discovered that I had inadvertantly used 10Ω resistors for R1 & R9, instead of 10KΩ (my eyes have begun to deteriorate these last couple years). Not knowing what other components may have been damaged by this stupid mistake, I'm going to...
I've replaced the potentiometer with a 56K resistor (still not working, of course). The pins of the 555 show the following voltages:
Pin 1 = 0.01V
Pin 2 = 4.18V
Pin 3 = 0.02V
Pin 4 = 5.16V
Pin 5 = 3.74V
Pin 6 = 4.17V
Pin 7 = 5.28V
Pin 8 = 5.59V
Just out of curiosity, I broke the track at one...
Can I safely assume that the multimeter setting with the square wave symbol is the frequency counter? If so, I get no change in the value (1) shown on the multimeter.
Added after 10 minutes:
Jepeto,
Thanks for your reply.
While adjusting the potentiometer gives changing voltage readings at...
sinip,
Thanks for your reply.
I have checked and double checked all values and they are right.
I'm not sure I know how to check the clock. However, according to my multimeter, pin 3 of the 555 has a constant voltage of 0.02V. Would I be right in assuming that this should change momentarily...
Well, I've built the above circuit, only to find that it doesn't do what it should. While it does light up all the LEDs, it doesn't light them progressively. In fact, each time I connect the power supply, a different number of the LEDs light up (sometimes all of them). The potentiometer doesn't...
Hey guys & gals. I'm just getting started in electronics (beginner hobbyist). I came across this schematic for a project that I'd like to have a go at building. However, due to my novice status, identifying components on a schematic sometimes gives me grief. I know what most things are on this...
What language is that? Arabic perhaps? In any case, any possible usefulness is limited to a minority of the members of this international community. The rest of us see it only as a bunch of incoherent scratchings. We can't even be sure the site offers any useful information (if any of us...
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