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Useful starting out

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2007-2009 » Archive through 26 September, 2007 » Useful starting out « Previous Next »

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Username: cherrytree

Post Number: 348
Registered: 08-2005

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Posted on Saturday, 22 September, 2007 - 12:14 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi to all,
this is directed to anyone who's just Starting out in Electronics.. and whishes to use the 555 Timer Circuit.. in astable mode with helpful

Wire the timer up in astable Mode
that is Pin 2 goes to Pin 6
Pin 4 goes to Pin 8
Output is Pin 3..

Helpful Frequencies
R1 into pins 7and8=4.7k
R2 into pins 6and 7=10k 10,000 ohms
C1= first 10uf farads electrolitc Capacitor..- & + on the leads
10 uf elec=5.8cps
1uf electrolitc =58hz close to mains Freq)
100nanofards = 580HZ
10 nanofards = 5.8khz thats 5.8 thousand csp in a second..
1nanofard or a 1000pf as the say =
and the Capacitor goes into Pins one and two.
take a 1.5k Resitstor from pin 3 connect the anode to pin three via the 1.5k res..
and then put the cathode into the Negative ov rail of the circuit.
JOB Done.

PS: There a multitude of Frequencies and werid effects you can get from these timers if the got the Time and patients to do it..

This is a bit more techy.. if you hook up aother timer in astable mode keep R1 & R2 the same values.. but change C1 on the other Chip to a different value then you can get Space sounds or Warble effects but that take a few maths to do this Ive done it, but not easy..
with Trial & error you can do it.

Hope this helps anyone starting out on the Chip as Stated above.
all & Newbies

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