Circuits & Schematics Analog Devices

1. 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
2. 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

3. 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
4. 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
5. 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
6. 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
7. 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
8. White-LED driver provides 64-step logarithmic dimming
   Will Hadden
   Circuits Supply Light Analog Devices MAX1573 MAX4480
   The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3 V source and adjusts the total LED current from 1 to ...
   Apr 14, 2025
9. Test technique quantifies jitter of discrete-comparator design
   Tim Davis
   Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
   A colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the discrete comparator compared to an IC comparator, which was used with an ...
   Apr 9, 2025
10. Design an RTD interface with a spreadsheet
    Robert S. Villanucci
    Circuits Analogue Design Measurement Analog Devices AD633 OP177
    RTDs (resistance-temperature detectors) are the preferred sensor choices for designs requiring precision. Although RTDs are approximately linear over the limited temperature range of 0 to 100 C, these sensors exhibit a slight but progressively more ...
    Feb 25, 2025

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