Circuits & Schematics Analog Devices

1. 3V sweeping siren alarm
   David A. Johnson
   Circuits Audio Oscillators Analog Devices LTC1799
   A while back I was challenged by a visitor to the website. He needed a very loud sweeping siren type audio sound generator powered by 3 V. He tried some of the commercial sirens but they were not very loud when powered by 3 V. He also said that ...
   Mar 17, 2026
2. Self-oscillating sawtooth generator spans 5 decades of frequencies
   Christopher Paul
   Circuits Oscillators Analog Devices ADA4891-1 LM4041 LT1720
   There are many ways of generating analog sawtooth waveforms with oscillating circuits. Here’s a method that employs a single supply voltage rail to produce a buffered signal whose frequency can be varied over a range from 10 Hz to 1 MHz ...
   Feb 16, 2026

3. Two-wire precision current source with wide current range
   Stephen Woodward
   Circuits Analogue Design Supply Analog Devices LM4041
   An interesting analog design problem is the precision current source. Many good designs are available, but most are the three-wire types that can be used as a positive (see Figure 1) or a negative (Figure 2) polarity source, but not both from the ...
   Dec 18, 2025
4. Circuit improves on bias for GaAs FETs
   Tom Roberts
   Circuits Supply Amplifiers Analog Devices LT1085
   It's important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC (monolithic-microwave-IC) amplifier. These devices are extremely sensitive to drain and gate voltage levels as well as to the order in which these biases ...
   Dec 3, 2025
5. Circuit offers series protection against power-line transients
   Alfredo Saab
   Circuits Supply Analog Devices MAX1614
   Voltage transients on low-voltage power lines can sometimes attain amplitudes many times the nominal voltage level. That behavior often calls for protection against the application of improper power levels. The usual way to protect sensitive ...
   Dec 1, 2025
6. Protecting your prototype with automotive overvoltage protection
   Simon Bramble
   Circuits Supply Analog Devices MAX16126
   Abstract This article describes the use of a load dump protection circuit to prevent accidental overvoltage/reverse-voltage conditions during prototyping. This simple circuit can prevent hours of rework caused by momentary lapses of concentration ...
   Nov 21, 2025
7. 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
8. 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
9. 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
10. 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

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