Print Go Down Pages:  Topic: Driving an LED from an Arduino pin/TTL pin *the right way*.(Read 6148 times) previous topic - next topic JoeN Edison Member Posts: 1,347 Karma: 98[add] I've been using the 1000mA BuckPuck for a while now for my flashlight mods. The power input wires/traces should also be kept short. No and no.
A standard 24VDC power supply is a good choice for this application. Correctly stated?A couple of popular low(ish) current npn transistors:2N39042N2222AFor driving simple 20ma leds I like the 2N7000 mosfet transistors, no series base (gate) resistor needed and they are cheap.LeftyOK, I know Reviewed by degarb 04/24/2016 - 08:56:20 PM Love it I use in my flashlight builds. View Basket Outstanding balance which reflects all unpaid changes due at this time per your selected payment method. http://www.petervis.com/Raspberry_PI/Driving_LEDs_with_CMOS_and_TTL_Outputs/Driving_LEDs_with_CMOS_and_TTL_Outputs.html
I especially like the MOSFET idea, thank you.Edit: The 2N7000 looks like a great part and Jameco has free shipping this week on orders of $25 or more so I picked Does the BuckPuck need some sort of cooling system? As far as i know, the TTL has at least 2,4V @ Voh, but i don't know the current. LED Housings Advanced LED Housing(s) Dynamic LED Housings(s) Dynamic 26mm LED Housing 26mm 1-Up LED Housing LED Light Engine Housings Dynamic 5W LED Heat Sink Advanced 3W LED Engine Housing
His articles and columns have appeared in virtually every significant electronics magazine, including Popular Electronics, Radio-Electronics, and Modern Electronics. A value of 1k\$\Omega\$ was probably alright for the TTL port, but didn't result in optimal LED brightness. External On/Off Control: Where a manual on/off control is desired, the potentiometer in Figures 10 and 11 in the documentation may be replaced by a push-button or toggle switch. Cmos Led Driver I have used many 74HCxxxx ICs and all of their outputs go to the positive supply and to ground when their output current is low or nothing. #13 Like Reply
Correctly stated?Thank you all. 74hc541 The minimum output high current is only 40uA and the max allowed output low current is 16mA.Click to expand... Product ID : 0A011-D-V-xxx 2 review(s) $19.79 Sale Price: $17.99 BuckPuck - Wiring Harness with Dimming Wires 7-pin SIP connection with 6" colored wire leads Product ID : 03021HE 0 review(s) The minimum output high current is only 40uA and the max allowed output low current is 16mA. #7 Like Reply Jan 25, 2011 #8 Wendy Moderator Mar 24, 2008 20,968
The Arduino has a reasonably low maximum drive current for the whole package and a lot of TTL packages have poor drive current. https://www.aliexpress.com/ttl-led-driver_reviews.html I wouldn't recommend doing it, but it will. Led Driver Transistor That we find on page 5. 74ahct541 How do I know the transistor is open and not operating in the ohmic region?
I didn't know the 74HCXX had such a strict output profile! #12 Like Reply Jan 25, 2011 #13 Audioguru New Member Dec 20, 2007 9,411 897 74HCxxxx outputs have lots Using commonly available components and remarkable ingenuity, Forrest shows you how to build and experiment with circuits like these:analog comparators audio synthesizers data loggers fiber optic sensors laser...https://books.google.ae/books/about/The_Forrest_Mims_Circuit_Scrapbook.html?hl=ar&id=-sE7JVywygQC&utm_source=gb-gplus-shareThe Forrest Mims Circuit There is 1 item in your request. In this case, a logic high will cause the output to be "on". Led Ttl Circuit
A much safer way is to use a buffer to drive the LED, this way if you drive too much current through the LED, you will damage the buffer IC and Mouser The 74LS06 has an open-collector output, which means it can only sink current. You must select at least 1 quantity for this product.CODE GENERATOR Electrical Contacts: 124 Add to request DescriptionSpecificationsDownloadsRelated ProductsDoric programmable LED Drivers are available in 1-, 2-, and 4-channel versions.
For multiple channel driver versions, each channel is controlled independently. Other Control Applications: In addition to the configurations described above, the 3021 may also be driven by a D to A converter. Why the fixation with a logic one turning it on. Digikey The good news is that there are other output configurations.
Need holistic explanation about the Rust's cells and reference counters Is Jon Snow really alive? Corporate headquarters and logistics centre in Mansfield, Texas USA. Posted by NatalieYapMin in forum: General Electronics Chat Replies: 1 Views: 430 How to turn on one led strip and off another in the same circuit using a trigger Posted by Strategies for self-learners to transition into working on larger projects Quoting a typo: Do I really have to do "sic", or can I just fix the sentence?
Not something I would do, but plenty good enough to light an LED. Yes, the BuckPuck is designed to work with 0-10V dimmers like ours here. Read More. Much better to aim at the 12-15mA mark.In that case 200mA is 13-16 LEDs.
How much experience do you have? #2 Like Reply Jan 24, 2011 #3 ADHD Thread Starter New Member Jan 18, 2011 5 0 I'm just a programmer enrolled in a Seems I have to make a serious revision of the 74XX family characteristics. Log In Create Account Order History Subscription Part No. / Keyword All All Capacitors Circuit Protection Computing Connectors Diodes & Rectifiers Embedded Processors & Controllers Embedded Solutions EMI/RFI Components Enclosures Engineering I've heard over and over that this is not the right way to do it and I can understand why.
About UsLEDSupply is built, owned and operated by a select few, all with technical backgrounds and over 25-years combined experience in the LED industry. It is down to the gain of the transistor.Help me on that. The SN74AC244N is an octal buffer chip, which has eight of these buffers. I worked with a huge office computer in 1970?
Product ID : 03021HEP-KNOB 1 review(s) $2.74 Sale Price: $2.49 BuckPuck - Wiring Harness with Dimming Wires 7-pin SIP connection with 6" colored wire leads Product ID : 03021HE 0 review(s) Included is an external DC analog voltage intensity control, TTL/CMOS logic level on/off control, and a built-in regulated 5V reference providing output to power logic circuitry or a microprocessor, eliminating the need Continue shopping Go to request CategoriesProductsLight Generation & ControlModulatorsPulse GeneratorsConnectorized Mechanical ShuttersLED IlluminationLED DriversLED ModulesLED + Fiber-optic Rotary JointLED Fiber Light SourcesLED Illumination AccessoriesLaser Diode IlluminationLaser Diode DriversLaser Diode ModulesLaser Diode Figure 2 shows the effective control range of the analog input signal.
You need to consult your notes and materials, since they may have their own ideas, but personally I wouldn't try to drive a LED directly using this (Wikipedia TTL schematic)... No, I don't answer questions sent in private messages (but I do accept thank-you notes...) Grumpy_Mike Brattain Member Posts: 51,276 Karma: 1669[add] Solder is electric glue http://www.thebox.myzen.co.uk Re: Driving an LED His articles on other scientific topics have appeared in a wide range of other publications, including National Geographic World, Science Digest, Highlights for Children, and Scientific American.