Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs

1. I built a 100W stereo class-D amplifier using TPA3221
   Sagar Saini
   Circuits Audio Amplifiers Texas Instruments TPA3221
   .. analog-in, speaker-out power amplifier that I could pair with any source. In this article, I will walk you through the full design. Why TPA3221? There are dozens of Class-D amplifier ICs out there. The TPA3116, TPA3255, MAX98400 but the ...
   May 6, 2026

2. ΔVbe + DMM = Celsius, Kelvin, Fahrenheit, and Rankine thermometer
   Stephen Woodward
   Circuits Measurement Linear Technology LTC2066
   .. temperature sensor with a standard digital multimeter can make an inexpensive, accurate, and useful thermometer. A recent Design Idea, BJT is accurate sensor for absolute temperature in Kelvin and Rankine ( Ref. 1 ), was based on a 1991 ...
   Apr 30, 2026
3. BJT is accurate sensor for absolute temperature in Kelvin and Rankine
   Stephen Woodward
   Circuits Analogue Design Measurement NXP 74HC4053
   .. ΔV BE temperature measurement is aptly described and applied here ( Ref. 1 ) by famed and forever remembered analog design guru Jim Williams (see page 7): At room temperature, the V BE junction diode shifts 59.16 mV per decade of ...
   Apr 30, 2026
4. Linearly variable two-wire loop current generator
   Jayapal Ramalingam
   Circuits Measurement Interfaces Texas Instruments LM124
   .. such as the design described here implement useful tools for a diversity of calibration and testing applications A two-wire loop current generator is a useful tool for the testing, calibration and commissioning of current-to-pressure ...
   Apr 24, 2026
5. Tiny continuity tester
   David Johnson-Davies
   Circuits Measurement Microcontrollers Usage Microchip ATtiny202
   .. I've used a slightly larger battery, the CR1025, and a battery holder which gives a more reliable connection than the wire clip used on the original. The circuit drives the piezo speaker in bridged mode from two outputs, to make it ...
   .. button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch. Introduction I design many of my projects for my own use, and the original Continuity Tester is one of the ones I use the most, to ...
   Apr 16, 2026
6. Double-duty current loop transmitter
   Stephen Woodward
   Circuits Analogue Design Interfaces Fairchild LM317
   .. (or otherwise)-caused cable cuts, and differentiating them from normal open circuits, is critical. Evolving the circuit design for expanded functionality makes it even more valuable. It’s just part of the job. Every design ...
   Apr 15, 2026
7. Newer, shinier DMM RTDs. Part 2
   Nick Cornford
   Circuits Measurement Analog Devices OP177
   .. 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 ...
   Apr 8, 2026
8. 5-V ovens (some assembly required). Part 2
   Nick Cornford
   Circuits Supply Microchip MCP6002
   .. bad news. With a PNP Darlington, the collector can be at ground, give or take a handful of millivolts. (The fine copper wire used to connect the module to the outside world has a resistance of about 1 Ω per meter.) Q1 drops ~1.3 V and so ...
   .. the first part ( Reference 1 ) of this Design Idea (DI), we looked at simple ways of keeping critical components at a constant temperature using a linear ...
   Apr 7, 2026
9. Laser scanning microscope from Blu-ray player
   Doctor Volt
   Circuits Laser Microchip MCP6004
   DIY Laser Scanning Microscope made from a defective Blu-Ray Player. A Blu-ray player must be able to detect the microscopically tiny pits on DVDs in order to play back a film. Therefore, the question arises: Can a Blu-ray player also see other ...
   Apr 1, 2026
10. 1 MHz 555 VFC
    Stephen Woodward
    Circuits Measurement Texas Instruments LMC555 TLV9051
    .. converters and the 555 analog timer chip, and therefore a double obsession with VFCs based on the 555. In fact, my first Design Ideas (DI) submission (in 1974) was for a 555 VFC. It was not only published but also selected as the best DI ...
    Mar 27, 2026

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