This circuit serves as a reference for the components used and the time. The circuit is from 1967 RCA documentation. MOSFETs from that time are used.
This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and...
We found this circuit in the October 1992 Radio Electronics magazine. The frequency is given by C1...
Although most common piezoelectric transducers have a reduction in performance at frequencies...