ArduIN-9
Connection with Main Board (K1)
Mark Description
1
12 VDC
2
Ground
3
Voltage doubler input
4
IN-9 supply voltage
1
2
3
4
K1 must be connected to main board connector K14.
IN-9 Tubes Connectors (K3, K4, K5, K6)
Mark Description
1
Cathode of tube #5
2
Anode (grid) of tube #5
3
Cathode of tube #6
4
Anode (grid) of tube #6
5
Cathode of tube #7
6
Anode (grid) of tube #7
7
Cathode of tube #8
8
Anode (grid) of tube #8
1
2
3
4
5
6
7
8
Connect the IN-9 tubes to these connectors. Connection of an IN-9 tube is optional. You
may connect any combination of IN-9 tubes.
Driving the IN-9 Tubes
Each IN-9 tube is driven by means of one of these signals on a specific input pin:
▪
A PWM signal. The PWM signal must be 5V. The PWM frequency should be at least
500 Hz, else the corresponding tube may flicker.
▪
An analog signal between 0 V .. 5 V. The input impedance is around 100 KΩ.
Input Pin
IN-9 Tube
K2.1
Tube #5 (K3)
K2.2
Tube #6 (K4)
K2.3
Tube #7 (K5)
K2.4
Tube #8 (K6)
An IN-9 tube reaches its maximum level typically at a PWM duty cycle of 65%. Use an
higher duty cycle to burn in a tube.
8
User Manual
