Free circuit dot com would like to present the frequency counter circuit uses IC MK50398 main operation and a multiplexed seven segment display and uses timer 1 to count edges of the input signal. The circuit uses the easier method of direct frequency measurement that is simple to do but means that the number of digits displayed depends on the input frequency. The MK50398 is the one modern decimal counter up/down of six tens IC, with control of screen LED of seven segments and flip-flop of storage. Counter it can measure additive and abstractively. The IC MK50398 is ideal for manufacture frequency counter as the particular circuit. Components part list IC3=MK50398 IC1-2-4=4093 IC5-6=4017 IC7=Not exist IC8=7812 TR1=220V-110Vac / 12V 0.5A R1=10Kohm R2-8=1Kohm R9=8.2Kohm R10=10Kohm R11=22Kohm R12=10Kohm C1-6=1nF 100V C2-3=150pF 100V C4-5=150pF 100V C7=47uF 25V C8-9-12=100nF 100V C10=1000uF 25V C11= 470nF 100V D1=12V 0.5W Zener D2=1N4148 . LD1-6 =7 segment Display Common Cathode D3-...