Circuits & Schematics - 12

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  1. Circuits Measurement Analog Devices LT1017 LT1034 LTC1043
    Figure 1 is a “charge pump” type V/F converter specifically designed to run from a 3.3 V rail. A 0 V to 2 V input produces a corresponding 0 kHz to 3 kHz output with linearity inside 0.05%. To understand how the circuit works assume ...
    26-06-2023
  2. This article describes an active load circuit that can be used to simulate a battery in any state of charge. The battery simulator provides a constant-voltage load for a battery-charging circuit, independent of applied charging current. The ...
    22-06-2023
  1. Circuits Measurement Supply Analog Devices LT1077 LTC1150 LTC1798 LTC6943
    It is often desirable to determine a battery’s internal resistance to evaluate its condition or suitability for an application. Accurate battery resistance determination is complicated by inherent capacitive terms which corrupt results taken ...
    22-06-2023
  2. Self-heated thermal airflow sensors are simple, cheap, rugged, and sensitive. However, they exhibit an airspeed to sensor temperature response ( King’s Law ) that is very nonlinear, as shown in Figure 1. Figure 1. The TO-92 junction ...
    21-06-2023
  3. Some circuits need a constant-current source that does not necessarily connect to a power-supply rail or to ground. The circuit in the Figure 1 shows a simple method for achieving that configuration. Figure 1. The simple method achieves a ...
    15-06-2023
  4. The isolation amplifier circuit of Figure 1 is simple but accurate. With the values shown it converts 0 to 5 V DC or low frequency signals with unity gain, but you can adjust the gain by changing R4. Figure 1. The floating sigma-delta converter U1 ...
    15-06-2023
  5. Designers often use chargers with flyback topologies to quickly charge energy-storage capacitors (references 1 and 2 ). In a flyback topology, the energy transfer takes place only when the charger’s power MOSFET is off, which effectively ...
    08-06-2023
  6. Two previous Design Ideas describe simple ways to automatically disconnect a battery from its load after a preset on period, which extends battery life (references 1 and 2). These circuits have little loss in standby operation, but they do draw ...
    08-06-2023
  7. I was reminded recently of a tester I designed years ago. At the time, I wanted to build “The Ultimate Continuity Tester,” and I established a wish list of all the features I required: A “real continuity” tester. Too many ...
    07-06-2023
  8. Energy meters, heating/ventilation/air-conditioning (HVAC) systems, and high-power equipments that run on three-phase ac inputs pose a challenge to power-supply designers because nominal input voltage can be as high as 540 V ac. The challenge ...
    05-06-2023
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