Velleman-projects K8055N Assembly instructions Instrukcja Użytkownika Pobierz pdf (Strona 9)

Mount the rubber feet on the solder side of the PCB, see fig 1.0.

19. Rubber feet

Fig. 1.0

Construction

The analogue inputs A1 and A2 have a standard range of 0 ~ +5Vdc. To use them externally, remove the

jumper caps on SK2 and SK3. The internal 5V voltage source can only be used for testing purposes. When

the input voltage is too low you can amplify it x4 / x15.

A gain of x4 requires a resistance of 3K3 for R53 (input signal 1) and for R54 (input signal 2). A x15 gain

requires a resistance of 820ohm.

When the gain is set to e.g. x4, the max. input voltage falls inversely proportional to 1,25V.

If you want a different gain factor you can calculate it quite easily using the following formula :

Gain A1 = 1 + (R44/R53) Gain A2 = 1 + (R43/R54)

18. GAIN FACTOR

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Brak uwag

Velleman-projects K8055N Assembly instructions Instrukcja Użytkownika Strona 9