Circuits & Schematics Measurement - 11

There are many circuits of soldering station controllers, but absolutely all close the temperature feedback loop using the soldering iron heater thermistor. The performances of the soldering station can be improved and the circuit can be made ...

The inverters in a CMOS CD4069 can be used for both analog as well as digital applications. This Design Idea illustrates this by using all six inverters in a 4069 package to make a closed loop, duty-cycle-based capacitance meter with a full scale ...

The simple circuit in Figure 1, which can be powered with a 3.6 V nickel-cadmium rechargeable battery, lets you use an LED to detect light. The circuit consumes practically no quiescent power. Two LEDs act as photodiodes to detect and respond to ...

Large analog systems that present many loads to a voltage-reference source can often demand more current than a single reference IC can deliver. However, if the reference IC includes force and sense terminals, you can easily add a buffer to the ...

Certain current-sense amplifiers have to contend with frequent overvoltages. For example, a current-sense amplifier that monitors battery discharge currents in an automobile must withstand high-voltage load dump pulses produced when loads are ...

When processing signals from analog sensors, you frequently encounter wide variations in attenuation among communication channels or sensors. Or, you face situations in which several identical sensors within a supervised system return signals of ...

The advent of inexpensive standardized 16- and 24-bit audio I/O hardware for personal computers inspired a rush of oscilloscope simulating applications. Many of these “Sound Card Scopes” are quite capable, providing input scaling, ...

This Idea for Design provides a visual indication of an input voltage’s relationship to upper and lower threshold values and can be used as a quick pass/marginal/fail tester. It uses a modified Wien-Bridge oscillator structure to create an ...

Resistance-based transducers, such as strain gauges and piezoresistive devices, find common use in the measurement of several physical parameters. For applications in which digital processors or microcontrollers serve for data acquisition and ...

The best way to make midrange, low- to medium-accuracy temperature measurements (considering size, cost, performance, and ease of use) is to use an IC temperature sensor. But most IC temperature sensors are designed for applications where the ...