Up one Powering. By Lee Davison. Up to top
Powering.

These boards can be powered from a single 12v AC transformer. To do this though you will need to make one small modification to the board. A link needs to be fitted from the unregulated +ve supply to the VFD +ve supply. This removes the need for an external supply for the VFD rail.

Power supply modification.

Power connector.

The power connector pins are on standard 0.156" centres. You have two options, either obtain the correct connector or use a PC AT style power connector, both will work though the PC power connector is a poor physical fit.

Power connection.

The connections to the power connector are ..

GND DC 0v rail
SP Loud speaker
Key No pin
UNL OP5 Output 5 from the UNL2003
UNL+ +ve supply for the UNL2003
VFD+ +ve supply for the VFD drivers
GND DC 0v rail
AC AC input
VFD+ +ve supply for the VFD drivers
AC AC input
Power pinouts and indicators.

Last page update: 4th May, 2004. e-mail me e-mail