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

31. A nice, simple, and reasonably accurate PWM-driven 16-bit DAC
    Christopher Paul
    Circuits Measurement Microcontrollers Usage Texas Instruments OPA383 REF35 SN74AC04 TS5A22362
    .. Replacing the R A 0.1% part with a 0.05% part Replacing the 30.1 kΩ R B2 with a 28.7 kΩ 1% resistor in series with a 5% 510-Ω unit. Driver power supply Alas, once again, we must abandon the goal of keeping the errors introduced to less ...
    .. maximum over the temperature range. The bias current is 76 pA maximum from 40 C to +85 C. I’d like to keep the design’s various independent error contributions under ½ PWM count (in this case, under 2 -17 of ...
    Aug 11, 2025

32. Cross connect complementary current sources to reduce self-heating error
    Stephen Woodward
    Circuits Supply Fairchild LM317
    .. discussions have sprung up here in editor Aalyia Shaukat’s Design Ideas regarding the limitations and quirks of, and design tricks for, the current control topologies shown in ...
    Jul 30, 2025

33. Flip ON Flop OFF for 48-VDC systems
    Jayapal Ramalingam
    Circuits Beginners Supply Texas Instruments CD4024B CD40106B
    .. have been numerous circuits published in EDN as design ideas (DI) for the past few months, centering around the “Flip ON Flop OFF” ( Ref. 1 ) circuit ...
    Jul 28, 2025
34. Converting pulses to a sawtooth waveform
    Christopher Paul
    Circuits Analogue Design Oscillators Analog Devices LM4041
    .. of U 2 , the tolerance contributions of these components are those previously mentioned for the “right side-up” design respectively. U 2 ’s reference current is typically less than 250 nA over temperature, but its V REF of ...
    Jul 21, 2025
35. Another weird 555 ADC
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments LM4040 LMC555 TLV9161
    .. voltage references with the same RC time constant. It thus automatically ratios out time constant tolerance. Slick. This Design Idea (DI) will describe a (possibly) new integrating converter that reaches a similar goal of accurate ...
    Jul 21, 2025
36. Three parts provide tenfold increase in switcher current
    Wayne Rewinkel
    Circuits Supply Texas Instruments LM2594HV LM2597HV
    .. often derive their power from widely varying sources that can exceed the 40 V maximum rating of popular switching ICs. This Design Idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60 ...
    Jul 17, 2025
37. Inherently DC accurate 16-bit PWM TBH DAC
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC04 OPA197
    .. precision,” some have inaccuracy and integral nonlinearity (INL) that significantly exceed 1 LSB. The TBH PWM-based design detailed here, by contrast, has inherent 16-bit DC accuracy and integral linearity limited only by the ...
    Jul 8, 2025
38. 1 amp current injector circuit
    David A. Johnson
    Circuits Measurement Supply Texas Instruments LM385-1.2 LM393 TLC555
    .. is 0.000001 ohms. I often use it to measure contact resistance of a relay or the resistance of big chunk of heavy gauge wire or the resistance of a copper trace on a circuit board. You can also use it to measure the voltage drop of a ...
    Jun 26, 2025
39. Simple PWM interface can program regulators for V_OUT < V_SENSE
    Stephen Woodward
    Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
    .. recently published a Design Idea (DI) showing some very simple circuits for PWM programming of standard regulator chips, both linear and ...
    Jun 24, 2025
40. Use a three-phase rectifier and voltage reducer for offline single-phase supplies
    Alberto Abal Pena Carlos Castro-Miguens José Benito Castro-Miguens Marcos Pérez-Suárez
    Circuits Supply Power Diodes TL431
    .. or higher line-to-line three-phase voltage. You can feed this value from two or three phases with or without the neutral wire or from just one phase with the neutral wire. This circuit omits two diodes from the typical three-phase ...
    Jun 23, 2025

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