1. R

    Frequency Counter Control Circuit

    Hi: I am building a frequency counter. I found a circuit that I modified slightly and that I hope will control my frequency counter. I have breadboarded the circuit and probed the output with my scope. I have attached a circuit diagram and the scope image. The negative output pulse should...
  2. H

    Frequency Counter Gate Control Using 74LS123

    Hi: I have breadboarded a frequency counter gate control circuit using the 74LS123 multivibrator. I have attached the schematic and a screen shot of the scoped output. The top wave form is off of pin#13 (to control the latching operation) and the bottom wave form is off of pin# 4 (to control...