So Esmeralda does not yield a square wave, this owing to the symmetry of thresh-hold voltages etc.. Next go around will only use 4 of the inverters so that one can be used to "un-invert". We just need a big humped-back male who can ring the bell.
Depending upon which hex-inverter + Schmitt trigger you use the frequency will be a function of k/RC where k is peculiar to the device used. As W2AEW mentions, k is in a range of 1.2 to 1.9. In the particular case of the device described the constant was 1.9. As you can see, this was a Radio Shack "Harris Semiconductor"(1) device from the bin of non-discarded digital goodies. Anyone need a 6805?
The 10%-90% rise time is ~ 4ns. I got pretty lucky with the ringing as I matched the length of the Rout resistors.
1) Harris, also known as Intersil, got their start making printing presses. Guess how IBM got into the punch-card business?
Depending upon which hex-inverter + Schmitt trigger you use the frequency will be a function of k/RC where k is peculiar to the device used. As W2AEW mentions, k is in a range of 1.2 to 1.9. In the particular case of the device described the constant was 1.9. As you can see, this was a Radio Shack "Harris Semiconductor"(1) device from the bin of non-discarded digital goodies. Anyone need a 6805?
The 10%-90% rise time is ~ 4ns. I got pretty lucky with the ringing as I matched the length of the Rout resistors.
1) Harris, also known as Intersil, got their start making printing presses. Guess how IBM got into the punch-card business?
