Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 4

31. Test technique quantifies jitter of discrete-comparator design
    Tim Davis
    Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
    .. circuit board (PCB) with ground plane. The board used a special scope probe-tip test point with a fitted, spiral ground wire, into which the probe’s ground-sleeve can fit. (This technique is often employed to reduce parasitic ...
    .. 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 ...
    Apr 9, 2025

32. A two-wire temperature transmitter using an RTD sensor
    Jayapal Ramalingam
    Circuits Analogue Design Measurement Texas Instruments INA122 LM334 XTR116U CD40106B
    .. “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the design of 4 mA to 20 mA, two-wire temperature transmitter using a platinum resistance temperature detector (RTD) sensor, as shown in Figure 1. ...
    .. an analog circuit can be a frustrating experience, as noted by Nick Cornford in his Design Idea (DI), “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the ...
    Jun 11, 2025
33. Two-wire precision current source with wide current range
    Stephen Woodward
    Circuits Analogue Design Supply Analog Devices LM4041
    .. 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 ...
    Dec 18, 2025
34. SCR topology transmogrifies into BJT two-wire precision current source
    Stephen Woodward
    Circuits Supply Fairchild LM317
    .. frequent Design Idea (DI) author Christopher Paul showcased an innovative and high performance true-two-wire current source using a depletion mode MOSFET as the pass device in “A precision, voltage-compliant current ...
    Jan 15, 2026
35. An LM317-based 0-20 mA to 4-20 mA 2-wire converter
    Ashutosh Sapre
    Circuits Analogue Design Measurement Interfaces Fairchild LM317
    .. 1 ) used the LM337 regulator in a novel circuit arrangement to translate an input 0-20 mA current source into a 4-20 mA two-wire transmitter current loop (a standard two-terminal industrial current source). The circuit can also be flipped ...
    .. 3296 types or similar, but single-turn trimmers may also work fairly well, as both pots have a small trim range by design. The di/dV, current stability, and ease of trimming are excellent. Input to output linearity of the basic ...
    Mar 5, 2026
36. Build Yourself a Fan Temperature Control
    Circuits Computers and Peripherals Domestic
    .. worse) the motherboard. Fan RPM monitoring will NOT work with this temperature control. Don't try to connect the rpm signal wire to your motherboard. It will not work and might damage your motherboard. Building a temperature control that ...
    Apr 28, 2008
37. Smart Coaster
    Circuits Domestic
    .. Try this one from SparkFun Electronics #COM-00104; $0.95 3.7 V battery (SparkFun Electronics #PRT-08818; $4.95) Scrap wire Round flat-top metal container (I used a salvaged Kiwi Brands shoe polish container -- just to prove to some of ...
    Dec 16, 2008
38. Quick Key Adapter, 10 Button HID Keyboard. Part 1. Schematic and PCB
    Circuits Interfaces Computers and Peripherals Microcontrollers Usage
    .. such as Molex KK 6471 6 pin Header, such as Molex KK6410 6 pin Housing, such as Molex KK 6471 Crimps, Molex KK 4809 Wire, solid strand and stranded Printed Circuit Board or Perforated Proto board and solid strand wire 10 Normally Open ...
    Sep 7, 2011
39. CMOS-NAND Gates Control Sump Pump
    V Gopalakrishnan
    Circuits Automation Texas Instruments CD4093B
    .. the wires when the water level falls below the sensors. You can also use any other high-conductivity and noncorrosive wire material in some configurations. The power supply is floating. With few modifications, the circuit in Figure 2 ...
    Aug 4, 2022
40. Arduino expansion board used for controlling large numbers of LEDs
    Circuits Embedded Systems Light Arduino
    .. is using an ATX power supply, with Sparkfun's adapter board(you need this too) and this adapter. You would solder the red wire to 5v on the adapter board, and the black wire to ground. Please note that you must also connect PS_ON to ground. ...
    .. used to supply the additional current, but should NOT be directly connected to the header, as battery voltage varies. A 5 volt voltage regulator, if your battery outputs more than 5 volts, or a voltage stepper, if you battery outputs less ...
    Nov 1, 2011

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