4 Digit Up / Down Counter using an Atmel AVR 90S1200 micro-controller. Reset, up, down, disable and overflow to a second counter. 4 digit multiplexed display. Oscillator contained within the micro. The first in a series of counters using uC's. This kits clearly shows how uC's can more than replace a host of ordinary logic IC's. This is a single-sided PCB. 9-15 VDC operation. Current consumption of 20mA to 40mA PCB size: 63mm x 50mm 2.48" x 1.97". Download documentation here: http://electronics123.net/amazon/datasheet/k129.pdf