Question for Electronics peeplezzzz - GoFuckYourself.com

2MuchMark · 01-01-2016, 11:16 AM

Do you know electronics? If so, I have a question:

Question 1.
Let's say you have some LED's, maybe 5 or 10. They are all the same type and voltage,but you don't know what type or voltage they are - you just know they are all the same.

If you connect them all in parallel, is there a way you can test the new circuit to know how much voltage & amps are required to light them all?

Question #2:
Same question as above, but the LED's are various types. Some are older (red), some are new (blue). Some are larger, some are smaller. The volts / amps required for each of them are unknown.

If I connect them all in parallel and want to light them, how can I measure to know what kind of power supply (and how many volts and amps) is required?

HNY!

PuppetMaster · 01-01-2016, 11:18 AM

Great question.

Barry-xlovecam · 01-01-2016, 11:29 AM

https://en.wikipedia.org/wiki/Ohm&#3...rcuit_analysis
OHM's Law

You would need a VOM meter instrument

Should be able to deduce it but the voltage rating should be the same for all the LED's it you want them to display right (I think?)
Wattage/Volts=Amps

Tom.K · 01-01-2016, 12:40 PM

all LEDs work on approx 2-4 V (depends on color) and you should put some resistors for voltage drop - to stabilize circuit (limit the current) so voltage should be higher. LED is semiconductor, not resistor like classic bulb. I found you nice text about LED voltage and how to create circuit. See the link down.
However, most of diodes will work ok if you put them on 3V battery and if you put them direct on higher than 6, they will die. if you put them parallel, you need resistor for each of them, voltage is same, but current is higher - if you have 12V supply (car battery), you can put them serial with one resistor (make calculation to design circuit) so it's cheaper and more simple - but if one is not working, all circuit is stopped
You can't measure the power supply - you need to calculate what you need by knowing your power supply voltage. Typical current for diodes is 20 mA so with that info you calculate which resistor do you need.

LED Basics; gaining an understanding of how to work with 3 and 5mm LEDs

here is wiki if you want to learn more about structure of diodes: https://en.wikipedia.org/wiki/Light-emitting_diode

2MuchMark · 01-01-2016, 01:41 PM

Thanks, thanks and thanks!

ErectMedia · 01-01-2016, 01:45 PM

Save time and just buy one already made...

DeLorean | eBay

SilentKnight · 01-01-2016, 01:52 PM

Cost-cutting LED's will soon be a big market in Quebec now that the transfer payments from Ontario have stopped.

rowan · 01-02-2016, 05:10 AM

The short answer is: you should use a resistor for each LED.

You can use a reasonable value resistor (like 500 ohms or 1k) in series with the power supply to find out the voltage of the LED (measure it directly across the two leads) but there is no real way to see how many milliamps it can take.

Different colour LEDs will often have different forward voltages, so running them in parallel (without their own individual resistor) will result in the LEDs with lower forward voltage dissipating more power. IOW, your red LEDs would be overly bright, possibly even to the point of failing, while your blue LEDs would be dim, maybe not even lighting at all.

One resistor for each LED.

01-01-2016, 11:16 AM	#1
2MuchMark Videochat Solutions Industry Role: Join Date: Aug 2004 Location: Canada Posts: 49,128	Question for Electronics peeplezzzz Do you know electronics? If so, I have a question: Question 1. Let's say you have some LED's, maybe 5 or 10. They are all the same type and voltage,but you don't know what type or voltage they are - you just know they are all the same. If you connect them all in parallel, is there a way you can test the new circuit to know how much voltage & amps are required to light them all? Question #2: Same question as above, but the LED's are various types. Some are older (red), some are new (blue). Some are larger, some are smaller. The volts / amps required for each of them are unknown. If I connect them all in parallel and want to light them, how can I measure to know what kind of power supply (and how many volts and amps) is required? HNY! __________________ Custom Coding \| Videochat Solutions \| Age Verification \| IT Help & Support www.2Much.net

01-01-2016, 12:40 PM	#4
Tom.K Confirmed User Industry Role: Join Date: May 2011 Location: Prnohrad Posts: 422	all LEDs work on approx 2-4 V (depends on color) and you should put some resistors for voltage drop - to stabilize circuit (limit the current) so voltage should be higher. LED is semiconductor, not resistor like classic bulb. I found you nice text about LED voltage and how to create circuit. See the link down. However, most of diodes will work ok if you put them on 3V battery and if you put them direct on higher than 6, they will die. if you put them parallel, you need resistor for each of them, voltage is same, but current is higher - if you have 12V supply (car battery), you can put them serial with one resistor (make calculation to design circuit) so it's cheaper and more simple - but if one is not working, all circuit is stopped You can't measure the power supply - you need to calculate what you need by knowing your power supply voltage. Typical current for diodes is 20 mA so with that info you calculate which resistor do you need. LED Basics; gaining an understanding of how to work with 3 and 5mm LEDs here is wiki if you want to learn more about structure of diodes: https://en.wikipedia.org/wiki/Light-emitting_diode __________________ Promote LustReality.com - Exclusive VR content / email me * Non-Exclusive content package on sale - contact me for info *

01-01-2016, 01:41 PM	#5
2MuchMark Videochat Solutions Industry Role: Join Date: Aug 2004 Location: Canada Posts: 49,128	Thanks, thanks and thanks! __________________ Custom Coding \| Videochat Solutions \| Age Verification \| IT Help & Support www.2Much.net

01-01-2016, 01:45 PM	#6
ErectMedia Confirmed Chicago Pimp Industry Role: Join Date: Aug 2004 Location: Chicago Posts: 7,100	Save time and just buy one already made... DeLorean \| eBay __________________ Domain Name Registration Web3 Domains

01-01-2016, 11:18 AM	#2
PuppetMaster Confirmed User Industry Role: Join Date: May 2002 Location: The Corporate Boardroom Posts: 545	Great question. __________________ Recognize Old Skool GFY. Vote for people like AaronM, JFK, Juicy, baddog and others who pioneered this place!

01-01-2016, 11:29 AM	#3
Barry-xlovecam It's 42 Industry Role: Join Date: Jun 2010 Location: Global Posts: 18,083	https://en.wikipedia.org/wiki/Ohm&#3...rcuit_analysis OHM's Law You would need a VOM meter instrument Should be able to deduce it but the voltage rating should be the same for all the LED's it you want them to display right (I think?) Wattage/Volts=Amps

01-01-2016, 01:52 PM	#7
SilentKnight Megan Fox's fluffer Industry Role: Join Date: Oct 2005 Location: shooting pool in Elysium Posts: 24,818	Cost-cutting LED's will soon be a big market in Quebec now that the transfer payments from Ontario have stopped.

01-02-2016, 05:10 AM	#8
rowan Too lazy to set a custom title Join Date: Mar 2002 Location: Australia Posts: 17,393	The short answer is: you should use a resistor for each LED. You can use a reasonable value resistor (like 500 ohms or 1k) in series with the power supply to find out the voltage of the LED (measure it directly across the two leads) but there is no real way to see how many milliamps it can take. Different colour LEDs will often have different forward voltages, so running them in parallel (without their own individual resistor) will result in the LEDs with lower forward voltage dissipating more power. IOW, your red LEDs would be overly bright, possibly even to the point of failing, while your blue LEDs would be dim, maybe not even lighting at all. One resistor for each LED.