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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
I have before made a simple 555 oscillator and im trying to make it again, how ever, i cant seem to get it to work. I tested all the connection with a multimeter and checked the schematic. I also replaced the 555 to no avail. The resistors are both 227ohms, and a 300ohm resistor before the LED. The capacitor is a 16v 220uf electrolyctic, and the power source is 14v (making sure that the 55 dosnt over heat).
When i apply power, the LED just stays on, and when i disconnect the power, the LED fades off, so the cap is charging.
Here on some pics of the breadboard layout, can any of you see anything wrong with it? Sorry for the blurry pics.
Note: the indented circle is on the top left (pin 1), both power strips are connected.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
According to the data sheet, R1 should always be >1K.
Setting this on one side (assuming that it does indeed still function outside the design values as you report) then with the values you have given, the device formulae give
On time (t1) is 0.0692 seconds. Off time (t2) is 0.0346 seconds. Duty cycle is 66.7%. Frequency is 9.63 Hz.
Registered Member #1104
Joined: Tue Nov 06 2007, 07:38PM
Location: Wisconsin, United States
Posts: 34
Yea I’m sure it isn't meant to have that small of a resistor there. I accidentally mixed up my resistors when doing my first 555 circuit (stupid me) and a 47Ohm resistor ended up there and I blew out my 555. That’s also a rather large cap you have in there.
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555 oscillator
