.. 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 deflection below one picofarad. The inverters exhibit stable output with a direct feedback ...
.. previous Design Idea describes an interesting and useful method for using a moving-coil analog meter to measure currents in the less-than-1A range ( Reference 1 ). The design offers considerable flexibility in ...
.. the resulting voltage, averaged by C2 and C3, is measured by an external voltmeter. Figure 2. Complete schematic of C and L meter. Transients with an exponential decay that extend over a particular portion of the square wave period will ...
.. current loop. The output of the amplifier is linear from 350 to 1950 mV for 4 to 20 mA through the loop. The measurement meter at the output must not draw more than 5 µA from the output for 1% full-scale measurement accuracy. The ...
.. by a small slab of material with high thermal conductivity. Copper, whose thermal conductivity is 394 W/mK (watts per meter-degree Kelvin), is the ideal material. The input connections must be electrically isolated, but thermally ...
.. and estimating its average value after the process reaches steady state (Figure 1). In this situation, using an analog meter with marked red and green zones is preferable to using a digital or bar-graph LED display. Figure 1. It’s ...
.. output voltage that is proportional to the input power level in watts. You can easily adjust gain and offset for this power meter with an op-amp circuit, thus providing an output scaled in volts per watt. A complex RF waveform feeds the ...
.. When constructed with a LM386 manufactured by either National Semi or Samsung, this configuration can receive both the 80 meter and 40 meter amateur bands up to 8 MHz. Figure 5. The LM386 can be used to create a shortwave regenerative ...
.. battery testers. For today’s tutorial, we will add another tool to the list by examining the development of a Miliohm meter (Figure 1). Figure 1. Arduino based Milliohm Meter with LCD display. A milliohm meter is a device used in ...