Why did you use rod material instead of a toroid?There are a number of problems with the CMOS 555 circuit as posted.
Firstly it is not efficient as the circuit does not know when the core is saturated.
Secondly it uses a lot of components. And there are other faults.
The circuit I have produced uses half the components and is much more efficient. This
circuit will also drive 2 white LEDs in series without alteration - but the LEDs
will be much dimmer.
I did a bit of searching and found this fellow's blog:Yeah, I might use them for other projects, but remember for these articles Radio Shack is the preferred provider.
They also have toriods too, so it might happen on another article coming up.
The sentence should read: When the voltage at pin 6 reaches 2/3 of the power supply. . .When the voltage across pins 2 and 6 reaches 2/3 of the power supply
The transistor Q1 is not primarily an inverter, it is a BUFFER.as well as the inverter made using Q1.
Should be:This circuit uses the exact same principles. Remember: principal is your PAL - like your headmaster.This circuit uses the exact same principals
the largest practical resistors are used to minimize current
Should be: the largest practical values of resistance are used to minimize current.
7. You will be lucky to turn off the second CMOS 555 with this circuit, as explained above. Transistors actually start to turn on at 0.52v and since Q1 is in a high impedance stage, it will very quickly bring the reset line of the second CMOS 555 above ground potential and activate the chip.
For many CMOS chips operating at 3v, the high will be 0.6v below rail and the second chip will never be turned off.
Perhaps you are more interested in selling your site than accuracy in your comments? Spam is not allowed on this site.Here is a link to my 50 555 Circuits. It has now grown to more than 61 circuits - many of which I have designed for a specific application:
URL Deleted.
No.The HIGH on pin 3 of some of the CMOS 555's is up to 1v lower than the supply and this circuit will not work. You may be lucky to get a chip that produces a HIGH that will turn the PNP transistor off.
The oldest posts (8 months ago) are the latest?? Boy is that ever confusing.The two posts in front are the article, I kept the others as part of the conversations.
by Jake Hertz
by Duane Benson
by Jake Hertz