Need Help with LEDs

[ANTlabs]

I have only been doing electronics for a year now and am new to this site. I need some help with a circuit I am putting in my Halloween costume this year.Please help me fill in some blanks for me. I need a circuit in which there are four push buttons, one leading to each of the fowloing: one button activates a white LED, a second one activates a circuit that makes 15 green LEDs fade in and out, another push button activates 4 red LEDs that also fade in and out, the final button activates a sound recording. Can someon please deveop a circuit and give me the schematic? I also have these questions:


1. will green and red LEDs shine through a thin black cloth?

2. How do you make a small voice recorder?

3. How much in-put voltage will the circuit need?

4. Is there anything the circuit is missing?

5. How much is this going to cost me!?!?


Any suggestions are welcome.

 

[audioguru]

I also have these questions:

1. will green and red LEDs shine through a thin black cloth?

I don't know. try it and see.

2. How do you make a small voice recorder?

Buy one in the sale the day after Halloween.

3. How much in-put voltage will the circuit need?

4. Is there anything the circuit is missing?

5. How much is this going to cost me!?!?

Look and see.

 

[ANTlabs]

I can't get a recorder the day after halloween because I need it for halloween.

Also I said I was very new to electronics and don't know how much power any circuit takes unless the schematic specifies it and I dont even know how to build the circuit. Let alone how much parts cost.

 

[audioguru]

The day after last Halloween I saw for sale exactly what you want for $2.00 each.
A Chinese company made millions of them.

You can design and make one if you want.

 

[ANTlabs]

Can you post the schematic. also I gave more detail at the top of the page.

 

[audioguru]

I have never designed nor looked at a cheap Chinese Halloween toy.

 

[ANTlabs]

Do you know how much power it would take to power 15 green LEDs or how to make a circuit that makes the 15 green LEDs fade in an out.

 

[birdman0_o]

15 green leds at 20mA constant is 3V*20ma*15 = 0.9W

 

[audioguru]

Unless they are extremely dim, lEDs use power.
Unless you have a huge and heavy car battery, a little battery does not have much power so it will not last long driving 15 LEDs.

 

[ANTlabs]

This ciruit slowly makes the LEDs fade n and out t about 1 cycleevery 30 minuits. ( of course I still need a scematic for said circuit).

 

[audioguru]

Half an hour is such a long time that you will not see the LEDs fade and brighten.

 

[birdman0_o]

lol thats a 2% brightness change every minute. Why half an hour?

 

[ANTlabs]

Oh...LOL... 30 seconds!!!

 

[colin55]

This circuit will fade the LED and gradually illuminate it:
**broken link removed**

 

[ANTlabs]

I need you to lable the ground and what is that triangle component. I have never seen it before.

 

[ke5frf]

That would be a Schmitt Trigger... helps with hysterisis.
Looks like the output is inverted, judging by the notation at pin 2.
The symbol inside means "hysterisis".

 

[ke5frf]

Why would you need the ground labeled? Isn't it fairly obvious?

 

[audioguru]

The triangle with the positive supply pin not shown and the hysteresis symbol inside is 1/6th of a hex Schmitt-trigger Cmos logic inverter IC called the 74C14. It makes a square-wave oscillator as shown with only one single feedback resistor and one timing capacitor.