BARACUDA-Legend-1

[kt315]

BOM file with George's mod note.

[kt315]

bara files uploaded again http://depositfiles.com/files/2n8gribya
do not pay in this site.

[BKY1337]

I found a perfect fitting enclosure for your small Barracuda Legend boards.




https://www.ebay.de/itm/Alu-Geh%C3%A...53.m2749.l2649

[homefire]

Nice if you don't mind out board battery.

[homefire]

I would need to change the Cap on my board. It would stand too tall I think.

[BKY1337]

I have bought the small one for 3x 18650 batteries and its perfect for them.
I mean the small one with the round edges.

Unfortunately my enclosure for the TGSL is very heavy. But the board fits in it like its made for it.

[BKY1337]

Can i use the LEDs from Tayda with 3,3V?

[homefire]

Of Course you can use LED's . 3.3v is sufficient with most LED's. Just use the appropriate Current limiting Resistors.

[BKY1337]

Can you tell me how much voltage the led in the Barracuda Legend Rev -B circuit uses?

EDIT: I guess its the battery voltage, so i need to change a resistor at my board for the 3,3 or maybe not because 3,3V is usual.

[homefire]

What are you trying to do here ?

[BKY1337]

What do you mean?
With 100R and 33R i have 2,977 Volts , so i think my 3,3V LED will work.

[Andi68]

The current of the LED must be limited, which is more important than the voltage- look for LED-Rechner

[BKY1337]

The LED calculator only shows me one resistor , but two resistors are used in the schematic.
I use the ohms law , voltage divider calculator.

The specs of my LED are 3.2 - 3.4 V and 20mA.

[waltr]

Can i use the LEDs from Tayda with 3,3V?

Depends on which LED and its V forward spec. Most IR, RED, Green, Yellow LEDs have a Vf of around 1.4V so 3.3 will work.
However, Blue, White and UV LEDs have a Vf of around 4V (check spec) so will not work with 3.3V.

The current of the LED must be limited, which is more important than the voltage- look for LED-Rechner

Exactly- Google biasing LEDs and read the Vf spec of the LED.
The supply Voltage most be higher than the LED's Vf and then CURRENT limited (set) to obtain the desired brightness AND not over current the LED.

Measure the Voltage Drop across the resistor to calculate the
LED current using Ohm's Law.

The specs of my LED are 3.2 - 3.4 V and 20mA.

Is that the Vf spec? If so then probably will not work from 3.3V. The Voltage must be higher than Vf so there is a Voltage drop across the current limiting resistor.
Otherwise one needs to use a Constant Current Source (or Sink) circuit to set the LED current.
The 20mA spec is the MAXIMUM allowed current. Much lower current is commonly used with a minor decrease in brightness.
I typically start at around 5mA for a 20mA max spec.

[BKY1337]

Depends on which LED and its V forward spec. Most IR, RED, Green, Yellow LEDs have a Vf of around 1.4V so 3.3 will work.
However, Blue, White and UV LEDs have a Vf of around 4V (check spec) so will not work with 3.3V.

Damn, i have only bought two different LEDs , white and blue.

Forward Voltage is like i said 3.2 - 3.4Volts.