[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

View post   
File: 34 KB, 800x600, Led1.jpg [View same] [iqdb] [saucenao] [google]
184206 No.184206 [Reply] [Original]

Ey /diy/ i need your help to conver this , into a flash thingy. capacitors and driver. o simply to light on the complete circuit.
Pic related

>> No.184207
File: 37 KB, 800x600, Led2.jpg [View same] [iqdb] [saucenao] [google]
184207

related. first i want to light on all the leds.

>> No.184208
File: 18 KB, 800x600, Led3.jpg [View same] [iqdb] [saucenao] [google]
184208

another one

>> No.184210

If you just want it to come on like a torch, what voltage do you want to run it at?

I'm going to assume a few batteries or a plug pack for a power supply, and I'll also assume they're white LED's with a current rating of 20mA and forward voltage of 3.3V each.

Seeing as you have 6 white LED's in series, you'll need to supply it with 24V and put a 200ohm 1/4 watt resistor (red black brown) between the power source and one of the black wires.

If you want to use 3x 9v batteries, you'll need a 360ohm 1/4 watt resistor (orange blue brown) instead.

>> No.184246
File: 14 KB, 374x295, circuit-astable-555.jpg [View same] [iqdb] [saucenao] [google]
184246

So you're asking how to make these LEDs flash?: 555 astable multivibrator.

Those look like white LEDs, and I'm reasonably sure from the pics that they are in series groups of three. White LEDs are usually 3V 20ma, so I'd power them with a 9v battery and a 100 ohm resistor.

>> No.184261

I think OP wants to turn them into a flash for a camera

>> No.184485

Yes, i'm trying to make a flash lamp for a cellphone camera. but also want to know how to use it like a simple torch, but>>184210 answer me that.

>> No.184679

>>184210
Actually it looks like 3 LED (pairs of 2) in series if you trace out the circuit in OP's picture. That means it would need about 10V to operate.

The LED looks more like they are more than your average 20mA ones if they are designed as camera flash. How much wattage, can't tell from picture.

>> No.184772
File: 26 KB, 499x350, Flash_SonEr.jpg [View same] [iqdb] [saucenao] [google]
184772

Ok, OP Here again, this is what that circuit used to be. a mobile flash of a sony ericsson T610. so 10V are reasonably. so, maybe use low voltage, like 5.5V. can be functional? any resistors?

>> No.184861
File: 86 KB, 800x600, LEDthing.jpg [View same] [iqdb] [saucenao] [google]
184861

I maintain that it is 6 LED's in series, with an ground plane that is not connected.

>> No.184863

As an addendum to the above, a properly designed LED driver will allow you to drive these from a lower voltage source. There are chips that will do it with minimal external parts.

>> No.184866

>>184863
any schematics or draws to do that?

>> No.184867

>>184861
6 in series would need up around 24v to operate. You just don't see voltages that high in battery powered consumer technology.

>>maybe use low voltage, like 5.5V. can be functional?
No. LEDs are not like incandescent bulbs. You can't just run them at half voltage and expect to get half brightness out of them. An LED has a specific forward voltage. If you go below this by a quarter of a volt it will not light up at all. If you go above by a quarter of a volt it will quickly break down.

>> No.184869
File: 151 KB, 877x719, Capture.jpg [View same] [iqdb] [saucenao] [google]
184869

>>184866
This is a high powered RGB stage light I designed using the AP8800 chip. I can't find the schematic at the moment, but I just copied the circuit from the datasheet and added some DMX to PWM components.

>everything stuffed into that one corner because the demo version of Eagle doesn't give me a choice.