Circuits & Schematics Analog Devices

1. DPOT push up/down
   Stephen Woodward
   Circuits Digital Analog Devices AD5220
   Some folks prefer pushbutton switches to take effect on push instead of release. These buttons do that very thing. I suppose it’s really just a matter of taste, but I’ve always liked momentary contact switches that act when you push ...
   Aug 26, 2026
2. Op-amp LC oscillator uses tank losses for amplitude stabilization
   Luca Bruno
   Circuits Oscillators Analog Devices AD633 LT1357
   This proposed design eliminates traditional additional requirements for AGC, AC coupling, and post amplification circuitry. This Design Idea presents a simple op-amp-based sine wave oscillator that directly generates a low-impedance bipolar output ...
   Aug 19, 2026

3. Push to increase, decrease a digital potentiometer
   Jayapal Ramalingam
   Circuits Digital Analog Devices AD5220
   Front-panel push button controls can conveniently adjust a PCB-mounted internal potentiometer’s resistance. Digital potentiometers in conjunction with MCUs find common use in analog circuits. The processor can adjust the gain of an amplifier, ...
   Aug 11, 2026
4. Simple, compact circuit conveniently controls devices and systems
   Michael Potash
   Circuits Supply Analog Devices LTC6992
   This easy-to-build PWM source is a handy testing tool for hobbyists, technicians, engineers and other RC-based device developers. I work at a university where I’m charged with designing and developing all manner of circuits and systems for ...
   Jul 27, 2026
5. Hi-end microphone preamplifier with variable compression, noise gating and adjustable gain
   Mike (mixos)
   Circuits Analogue Design Audio Analog Devices SSM2166
   The circuit shown in Figure 1 is a complete microphone signal conditioning system based on a single SSM2166 integrated circuit. Designed primarily for voiceband applications, this integrated circuit provides amplification, RMS detection, limiting, ...
   Jun 25, 2026
6. Newer, shinier DMM RTDs. Part 2
   Nick Cornford
   Circuits Measurement Analog Devices OP177
   In the first part ( Ref. 1 ) of this Design Idea, we saw how a cheap op-amp can give remarkably precise readings from an RTD. We also found that it was a false economy, owing to incurable thermal drift. This concluding part fixes that problem by ...
   Apr 8, 2026
7. 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
8. 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
9. 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
10. 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

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