May 2, 2013 · The "T" part refers to the shape of the LED. There are many different shape designators possible but about the only one you will see for an LED is "T". This part numbering system dates back to the days of incandescent lamps! Some trivia: A lamp for a common room light is an "A" shape and a globe shaped lamp is "G".-- Rich

Nov 26, 2012 · Just a wild guess, but LED 2 is connected to a 560 ohm resistor. That would allow about 5ma on a 5 volt supply or nearly 20ma on a 12 volt supply, so I surmise that LED1 and LED2 are your common, garden variety, 20ma (max) leds.

Apr 21, 2015 · After getting all 6 measurements it became clear that Vf was not a constant value. Based on the formula calculation, Vf ranged from ~1.9V to ~2.4 volts (depending on the supplied voltage value) for both green LEDs (even though they were different sizes). The value of Vf for the red LED ranged from ~1.7V to ~2.0V.

Mar 26, 2009 · 3) Connect your LED to test into the breadboard, cathode (short lead) to ground 4) Connect the LM317 between your variable +V (IN terminal) and the LED's anode (ADJ terminal). 5) Connect your volt meter across the LM317 (IN to ADJ). 6) Turn on the breadboard power, and slowly turn up +V until the voltage across the LM317 reads about 3.5v.

Aug 14, 2023 · Yes, I have both styles. The porch lights the TS is questioning about have screw base bulbs. In that case any bulb will work as long as it screws in. There ARE different sizes and styles of connectors for light bulbs. But in the TS case, it's simply an LED lamp with a standard screw base. This is not a solar panel, it's a photo resistor.

Dec 13, 2020 · Then use the 5V power supply voltage minus the LED forward voltage minus the turn on voltage drop of the Mosfet divided by the 0.8A per group to calculate the series current-limiting resistor. Click to expand...

Apr 4, 2025 · It’s a multi ability say/skill project. There’s 3-D printing there’s electronics there’s mechanical assembly That sort of thing. I have all the mechanical parts built it accelerates in four different places, quadrants if you will around a circle track, ball bearings, using coils and a sensor made up of a photo diode and an IR LED.

Jan 15, 2016 · I would like to make an LED dimmer that is controlled by a 5-6ohm rheostat. Here's what I'm doing. I want to change out bulbs in a couple of my cars instrument clusters to LEDs, but the stock dimmer circuit reportedly doesn't dim LED's well as it was just a simple rheostat in series with the incandescent bulbs.

Aug 21, 2019 · If you want to use a single-use primary (one-time use) battery, put six alkaline D cells in series for 9V or 8 D cells in series for 12 volts. You can, of course use smaller cell sizes -C, A, AA but capacity goes down as the cells get smaller.. Battery holders are available for the most common cell sizes.

Jan 31, 2018 · I'm new to circuits. I'm taking a digital logic class, and my textbook just went over the 4 terminals: Vdd, VD, Vs, and Vss. The textbook isn't explaining what they are or what they do. The only thing it explained is that VDD is the high voltage and Vss(Gnd is the low voltage). I also know that...