>The DAC-08H is made by Analog Devices. Sold in the UK by Farnell, not >sure about US sources. Got the numbers straight after checking AD's data. The National Semiconductor PN for the DAC-08HP is DAC0802LCN. This is a direct replacement. The linearity is +/-.1% full scale. The board is here, it's time to get the parts... Terry Bowman, KA4HJH "The Mac Doctor"