Circuits & Schematics Analog Devices

1. Power supply accepts wide input-voltage range
   Jim Windgassen
   Circuits Supply Analog Devices LT3008 LTC1871
   The switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20 V dc with high efficiency. The circuit operates at an input voltage as low as 1.5 V once it starts from a minimum of 2.5 V dc, allowing the switcher to ...
   Oct 22, 2025
2. Voltage-to-period converter offers high linearity and fast operation
   Jordan Dimitrov
   Circuits Measurement Microcontrollers Usage Analog Devices AD650
   The circuit in Figure 1 converts the input DC voltage into a pulse train. The period of the pulses is proportional to the input voltage with a 50% duty cycle and a nonlinearity error of 0.01%. The maximum conversion time is less than 5 ms. Figure ...
   Oct 21, 2025

3. Buck regulator and two inductors make dual-polarity converter
   Keith Szolusha
   Circuits Supply Analog Devices LT1956
   A common problem for power-supply designers is to create a compact, dual-polarity step-down converter. If space and cost are not concerns, the obvious solution is a pair of DC/DC converters, one for each output. But space and cost are almost always ...
   Oct 8, 2025
4. Signal conditioning for platinum temperature transducers
   Jim Williams
   Circuits Analogue Design Measurement Analog Devices LT1006 LT1009 LT1027 LT1078 LTC1290
   High accuracy, stability, and wide operating range make platinum RTDs (resistance temperature detectors) popular temperature transducers. Signal conditioning these devices requires care to utilize their desirable characteristics. Figure 1’s ...
   Sep 10, 2025
5. Simple but accurate 4 to 20 mA two-wire transmitter for PRTDs
   Stephen Woodward
   Circuits Analogue Design Measurement Interfaces Analog Devices LM4040
   Accurate, inexpensive, and mature platinum resistance temperature detectors (PRTDs) with an operating range extending from the cryogenic to the incendiary are a gold (no! platinum! ) standard for temperature measurement. Similarly, the 4 to 20 mA ...
   Sep 2, 2025
6. Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
   Christopher Jarboe Thomas Mosteller
   Circuits Audio Supply Analog Devices LT8362
   Professional condenser microphones require a 48-V supply to charge the internal capacitive transducer and power the internal buffer for the high-impedance transducer output. You can use a simple boost converter, a filter circuit to reduce ...
   Aug 25, 2025
7. Converting pulses to a sawtooth waveform
   Christopher Paul
   Circuits Analogue Design Oscillators Analog Devices LM4041
   There are multiple means of generating analog sawtooth waveforms. Here’s a method that employs a single supply voltage rail and is not finnicky about passive component values. Figure 1 shows a pair of circuits that use a single 3.3-V supply ...
   Jul 21, 2025
8. Fast response 1 Hz to 2.5 MHz V-F converter
   Jim Williams
   Circuits Measurement Analog Devices LT1004 LT319A LTC1052 LT1056
   Figure 1’s circuit is not as fast as some other circuits, but its 2.5 MHz output settles from a full-scale input step in only 3 us. This makes the circuit a good candidate for FM applications or any area where fast response to input movement ...
   May 14, 2025
9. LM4041 voltage regulator impersonates precision current source
   Stephen Woodward
   Circuits Supply Analog Devices LM4041
   The LM4041 has been around for over 20 years. During those decades, while primarily marketed as a precision adjustable shunt regulator, this classic device also found its way into alternative applications. These include voltage comparators, ...
   Apr 27, 2025
10. Water-leak detector uses 9V batteries
    Yongping Xia
    Circuits Measurement Analog Devices MAX934
    A previously published Design Idea describes a practical gadget that has the potential to save a lot with little investment ( Reference 1 ). However, the circuit uses 120 V line voltage and, as such, it is not that convenient for many applications. ...
    Apr 18, 2025

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