The IC gates will require a very supply low current. DR gates would require a little more current.The Questions I asked.Were Not demands.I don't demand anything.From anyone.
Your text had a demanding tone. My wife read it & felt the same.
Who would take the time to Help ME.This is why i join the forum.
How do i not show appreciation. The occasional please & thank you would help.
I posted links.I search for parts.To help make the circuit a smaller size.
There was no demands intended. I did not think it was intentional, but I felt I should point out how it came across.
These questions are necsessary. I'm happy to answer the questions. I know you want to learn, so the questions are necessary. So i could try and get a better understanding of the posted circuit.
And breadboarding the circuit..I'm a newbe at this stuff.Bare with me.I need to ask questions on what i don't understand.
Isn't that a part of learning this electronic sfuff.By asking what you don't know. Exactly, I had no problem with the questions, it was just the tone of the English.
I go to school.So i wasn't home to get back to you.And they don't let us use our netbooks or go online during class.
That's why i couldn't get back to you on the gating.
As for the gating? If space is at minimum.Then you can go with the ICs for gating this will give minimum low current drain. Right? See below.
Appreciate your time and help.
The data sheet does not indicate how to determine the value of these resistors.View attachment 63654
Len
The circuit on page 8 in the 4521 datasheet the low current optional *R.
How do i calculate for these resistors in your circuit.
The LED's should be red or green as these have the lowest voltage drop.
I'm working from memory, so I must test the ones I have.In all 20mA LEDs I work with, I notice that the forward voltage of the red ones is about 2V and of the green ones 3.3V.
But perhaps, it is just me. For instance, yellow (and likely orange) LEDs are closer to the red ones.
After all, one can easily test an LED to measure its forward voltage for each driving current.
Kerim
Here are my resultsHi,
You may like to connect one red LED in series with a green one and a limiting resistor of 330 Ohm and drive them with 12V power supply. The current will be the same for the two LEDs; about 20mA. You can measure the LED forward voltage of each. I wait for your test result, perhaps there are different types for the green LED. Thanks
Kerim
ljcox
I need to ask you about the block diagram in post # 23
I really need to understand this diagram before i begin
to construct the circuit. Please Help?
The 32.768khz crystal. Is that the FQ its resonating at Yes
And the passive compoenets are calculated for this crystal.So it can work at that FQ. Yes
What is the on/off pluse rate that the timing set at. Is it 16secs on and 16 secs off. See below
How long will it take to count to 524288 bits for the bistable flips to go High.
So would the total timing period be 32secs on/off. What is and should be the
FQ on the output of pin 11.
like to know what dose 225 meaning on the CD4520BE. I assume you're refering to the "Modulo 225" above U2 on the circuit. See below.
What will the FQ be on the the out modulo I don't understand this question. Which counter are you asking about? The frequency is of little value in this case since the periods are very long. eg. The output of U1 has a period of 16 sec. This is 1/16 = 0.0625 Hz.
thanks
You're welcome.Thank you Len.
It seems not all green LEDs need about 3.3 volts as mine...
Sorry for taking your time to check this difference for me.
Thanks.
Kerim
KermiThank you Len,
I think, from now on, I should test the LED voltage everytime I got some from a new source
I wish my green and red LEDs have rather close voltages, since now each color needs different driver and sometimes different power supplies if in series.
Kerim
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