Since there does a checker of batteries of 4,8V TTL

Tomeu Simó, we are sent by this Checker of Batteries of 4.8v (TTL). Great thank you.

Electrical scheme:

1.-Materiales

• A badge of perforated printed circuit of 55x40 mm
• Integrated circuit LM3914
• Electrolytic condenser 2.2μF
• Diode 1N4001
• Potenciómetros (470 Ω, 100 Ω)
• Resistances (10K, 20K, 2 of 280 Ω, 100 Ω, 825 Ω)
• 10 LED's (4 red ones, 2 yellow ones, 4verdes)
• A box to put the whole set and to hold the leds

To see the attached scheme to know the exact components.

Assembly of the components in the badge:

• The resistances are mounted, then two potenciómetros, the electrolytic condenser, then the diode and finally the integrated one

Detail of the leds:

Components on the badge

• The potenciometro R4 fits the threshold of intensity that comes to the leds.
• The potenciometro R6 is the manager of the calibration of the checker.

Finished assembly of the checker of batteries

3.-Calibración of the checker:

There is taken a pack of batteries of 4.8v and with the polímetro the tension is verified in terminals of the battery. In accordance with this tension there looks in the attached table the number of the led that should be burning. Continued the battery gets connected to the checker, being careful with the polarity. With the potenciómetro R6 we will fit until the illuminated led is the one at that we look earlier in the table and that corresponds to the current tension of the battery. Next we put the table for the calibrated one.
LED
VCC (V)
4.51v - 4.60 v #1
4.61v - 4.70 v #2
4.71v - 480 v #3
4.81v - 4.90 v #4
4.91v - 5.00 v #5
5.01v - 5.10 v #6
5.11v - 5.20 v #7
5.21v - 5.30 v #8
5.31v - 5.40 v #9
5.41v - up #10
This table costs us to know that we have tension according to the led that ignites. In spite of the fact that there knows which is that of the limit that we want for our batteries, then it will be enough that it is in a top led and we will know all that loads he has left.

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Torrent Melrose Place (2009) S01E14 Stoner Canyon online