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

31. Capacitive position sensor with linearized output
    Stephen Woodward
    Circuits Measurement Texas Instruments SN74HC4066 TLV9051
    .. circuit also ratios sensor capacitance to a reference capacitor to measure micrometers this time linearly. A few weeks ago, Design Ideas published a simple circuit of mine that provides an analog interface to capacitive position sensors ( ...
    Jun 25, 2026

32. A pot of many colors
    Nick Cornford
    Circuits Analogue Design Microchip MCP6002
    .. pair to drive not just two but three LEDs. As everyone knows, rainbows always have pots of gold at their ends. This Design Idea reverses that, starting with a pot (no gold, alas) and ending with a rainbow. Bi-color LEDs can be ...
    Jun 24, 2026
33. 4-20mA to 0-20mA converter sips mere microamps
    Stephen Woodward
    Circuits Analogue Design Interfaces Diodes AP4310A
    .. like TO220 packaged power pass transistors sporting substantial heatsinks. Would Greta T. approve? I think not!7 The design in Figure 1 offers a cool (and maybe even useful) efficiency improvement. It thriftily recycles most of the 4 ...
    Jun 23, 2026
34. 4mA-20mA to 0mA-20mA converter's current mirror drives grounded load
    Stephen Woodward
    Circuits Analogue Design Interfaces Texas Instruments TLV197-Q1 TLV431
    .. V REF input of Z1. The principle in play is discussed here ( Ref. 1 ). A potentially annoying shortcoming of the Figure 1 design, however, is its current sink output that’s referred not to ground but to the V+ source node, which ...
    Jun 15, 2026
35. Dual-fan PWM cooling circuit with a 6W isolated flyback power supply
    Hesam Moshiri
    Circuits Supply Microcontrollers Usage Atmel ATtiny13
    .. project presents the design and implementation of a dual-fan PWM cooling circuit, integrating a compact and efficient power supply with ...
    Jun 15, 2026
36. Zener test circuit serves as DC source
    John Jardine
    Circuits Measurement Supply Texas Instruments SN74HC132
    .. Design Idea describes a versatile test circuit for zener diodes after yet another misread zener diode had ...
    Jun 8, 2026
37. Triply simply sequence supply voltages
    Stephen Woodward
    Circuits Supply Texas Instruments CD40106B
    .. circuit design for power supply on/off sequencing uses Schmidt triggers for triple-positive-rail timing purposes. Recent ...
    Jun 4, 2026
38. 4/20mA to 0/20mA loop current converter for grounded loads
    Jayapal Ramalingam
    Circuits Analogue Design Measurement Interfaces STMicroelectronics LM124
    .. common in industry. This circuit implements current loop conversions for them. Recently, there have been several published Design Ideas on converting 0/20 mA to 4/20 mA current and 4/20 mA to 0/20 mA current as full-circle current loop ...
    May 25, 2026
39. Triple-duty current loop calibrator
    Stephen Woodward
    Circuits Measurement Interfaces ON Semiconductor LM337
    .. to 4/20mA converter. Woodward, Stephen. Double-duty current loop transmitter. Ramalingam, Jayapal. Linearly variable two-wire loop current generator. Materials on the topic Datasheet ON Semiconductor LM337
    .. always gratifying when a simple and successful design idea luckily turns out to have additional applications that you didn’t originally envision. ...
    May 21, 2026
40. 30A AC soft starter (inrush current limiter)
    Hesam Moshiri
    Circuits Arduino Supply Microcontrollers Usage Atmel ATtiny13
    .. C7 are output capacitors to stabilize the regulator output voltage and reduce the noise. NTC is a 2 Pins XH connector to wire a 10K NTC to the board. R6 and NTC build a voltage divider, where voltage variations indicate changes in the ...
    .. current flow, ensuring a smooth and efficient start-up, while protecting your equipment from damage. So I decided to design this AC soft starter that is equipped with a fail-safe mechanism. During start-up, the inrush current passes ...
    May 20, 2026

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