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

31. Silly simple precision 0/20 mA to 4/20 mA converter
    Stephen Woodward
    Circuits Analogue Design Measurement Interfaces ON Semiconductor LM337
    .. loop current. Set input = 20.00 mA. Adjust R2 for 20.00 mA loop current. Done. The input voltage burden is a negative 1.0 volt. The output loop voltage drop is 4 volts minimum to 40 volts maximum. The maximum ambient temperature (with no U1 ...
    .. Design Idea (DI) offers an alternative solution for an application borrowed from frequent DI contributor R. Jayapal, ...
    Dec 6, 2025

32. A 0-20mA source current to 4-20mA loop current converter
    Jayapal Ramalingam
    Circuits Analogue Design Measurement Interfaces STMicroelectronics LM124
    .. record, and control these process parameters. This equipment will supply 24 VDC to a typical transmitter through one wire and receive current proportional to the process parameter through another wire. Typically, two wires are needed ...
    Dec 5, 2025
33. Gold-plated PWM-control of linear and switching regulators
    Christopher Paul
    Circuits Supply Microcontrollers Usage Texas Instruments OPA2376 SN74AC04
    .. value of V IN is required by the regulator, an inexpensive LDO can provide an appropriate U 2 supply. I grant that this design might be overkill, but I wanted to see what might be required to meet the goals I set. But who knows, ...
    Dec 4, 2025
34. Circuit offers series protection against power-line transients
    Alfredo Saab
    Circuits Supply Analog Devices MAX1614
    .. operation, including 3 µA by the undervoltage-lockout, voltage-sensing divider and 17 µA by IC 1 . If your design needs high-temperature operation, note that the gate-current output of IC 1 is relatively limited. Your ...
    Dec 1, 2025
35. A simpler circuit for characterizing JFETs
    John L. Waugaman
    Circuits Measurement ON Semiconductor MPF102 MPF4392
    .. of the meters was used to maintain the measurements for the photograph. The supply for this implementation is a nominal 12-volt “wall wart” salvaged from a defunct router. Figure 2. The test of an MPF4392 N-Channel JFET using the ...
    Nov 26, 2025
36. Protecting your prototype with automotive overvoltage protection
    Simon Bramble
    Circuits Supply Analog Devices MAX16126
    .. part is in shutdown so the resistive divider networks on the UVSET and OVSET pins do not load the input voltage. In this design, the UVSET pin is tied to the TERM pin so the MOSFETs are turned on when the device reaches its minimum ...
    Nov 21, 2025
37. 85VAC-260VAC to 12V-0.5A AC-to-DC flyback converter using an RM6 ferrite core
    Hesam Moshiri
    Circuits Supply Dongke Semiconductor DK106
    .. According to the datasheet, the features of the DK106 are as follows: 85 V 265 V wide-range AC power input. Double chip design with bipolar junction transistor (BJT) to save cost. Large-scale MOS digital circuit design with E class BJT ...
    Nov 17, 2025
38. My 100-MHz VFC - the hardware version
    Jim McLucas
    Circuits Measurement Texas Instruments CD74HC14 SN74LVC1G14 74LVC1G74 TLA431 TLV9162
    .. sensitivity of the circuit to minute changes in the input voltage. The sensitivity is 100 MHz per 5 volts, i.e., 20 MHz per volt. That means a 1-mV change on the input results in a 20-kHz change in the output frequency! So, how do you supply ...
    .. a PCB, purchased the (mostly) surface-mount components, loaded and re-flow soldered them onto the PCB, and then tested the design. Figure 1. VFC design that operates from 100 kHz to beyond 100 MHz with a single 5-V supply, providing ...
    Nov 14, 2025
39. Stereo digital FM transmitter circuit
    Hesam Moshiri
    Circuits Microcontrollers Usage Radio KT Micro KT0803L
    .. conducting some tests, it was found that the circuit operates quite stable, and the received sound is clear and sharp. To design the schematic and PCB, I used Altium Designer 23 and shared the project with my friends to get their feedback ...
    Nov 6, 2025
40. Programmable current source with overtemperature shutoff
    Stephen Woodward
    Circuits Supply Texas Instruments OPA186
    .. we’ve seen Design Ideas for programmable current sources with improved accuracy using the LM3x7 series of three-legged ...
    Oct 28, 2025

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