Instructions

9
 IC1 : TLV274IN
 IC2 : ULN2803
 IC3 : VK8055
Programmed PIC16C745-IP !
 IC4 : ULN2803
16. IC’s. Watch the
position of the notch!
PIN 1
1
Construction
 SK8 : 5 x 3P
When the input voltage is too low you can amplify it x4 / x15.
A gain of x4 requires a resistance of 3K3 for R8 (input signal 1) and
for R9 (input signal 2). A x15 gain requires a resistance of 820ohm.
If you want a different gain factor you can calculate it quite easily
using the following formula :
Gain A1 = 1 + (R10/R8) Gain A2 = 1 + (R11/R9)
17. GAIN FACTOR
Mount the rubber feet on the solder side of the PCB, see fig 1.0.
FIG 1.0
18. Rubber feet