.. back in 1986, famed analog innovator Jim Williams, in “Designs for High Performance Voltage-to-Frequency Converters” ( Reference 1 ) published his “King Kong” 100 MHz VFC. I have never seen ...
.. by 10 circuit. The equation below can be used to obtain the time delay, T, in seconds. Where F is the U1 (555) oscillator frequency in Hz. Figure 1. The above circuit produces an OFF delay of 30 minutes. The switch SW1 can be thrown on ...
.. the level of liquid water in a vessel such as a swimming pool. The LMC555 sensor oscillator provides an output-signal frequency that is a function of the water level. This signal drives a DS2423 pulse counter. A host PC or µC ...
.. suited for a wide variety of applications. For example, low-power op amps can be used in a low-power system, and high-frequency op amps can be used for a high-frequency PWM. The circuit in Figure 1 also generates a triangular wave. ...
.. from C1’s 2.2 µF summing point capacitor (Trace D) via Q5 and Q2. C1 servo-controls this oscillator to whatever frequency is required to maintain C1’s summing point near zero. Since the current into C1’s input is ...
.. output crosses the D input’s trip point, switching again occurs and the entire process repeats. The repetition frequency depends on the input-derived current, hence the frequency of oscillation is directly related to the ...
.. in the feedback path of a switched-mode power supply. The CTR determines the DC gain of a power supply’s open-loop frequency response, which affects the loop’s phase margin. An optocoupler influences multiple operating ...
.. methods for analog to digital conversion are more “mature” than the classic combination of a voltage-to-frequency converter (VFC) with a counter. VFC digitization is naturally integrating, so good noise rejection is ...
.. asymptotically approaches the comparator output voltage with a time constant RC. This time constant RC determines the frequency of the oscillation. The duty cycle of the signal can be adjusted by changing the ratio of resistance of ...
.. capacitor C2 is reduced by several orders of magnitude. This makes the current pumped directly proportional to oscillator frequency: Starting from that idea, then adding some simple discrete components, our original inverter circuit ...