Thank you for your suggestion. I will try a schmitt trigger circuit, but do I need a different clock pulse for each frequency range? The ones I need are 9.9Hz-99Hz, 100Hz-9.9kHz, 1kHz-99kHz, 100kHz-990kHz, and 1MHz-9.9MHz. Or can I divide the frequency as it comes into the circuit with the AND gates? I have to read much higher frequencies than I am familiar with so this is kind of new to me. Also, is a 4029 an AND gate that I can use for the frequency division?