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

1. Ultrasonic range finder with RP2040-Zero & LVGL GUI
   Hesam Moshiri
   Circuits Measurement Microcontrollers Usage Waveshare Electronics RP2040-ZERO
   .. brightness. Touch support: Touch-enabled (resistive or capacitive) and non-touch variants are available. Interface: SPI (4-wire or 3-wire) and sometimes parallel interfaces for high-speed communication. Power supply: Operates at 3.3 V logic ...
   .. for program and data storage. GPIO pins: 20 GPIO pins, supporting I 2 C, SPI, UART, PWM, and ADC functionality. Compact design: Tiny form factor similar to the Raspberry Pi Zero, ideal for space-constrained applications. Pin ...
   Mar 19, 2026

2. DC to DC buck converter [Adjustable, 97% efficient, 3 A]
   Hesam Moshiri
   Circuits Supply MPS MP2315
   .. with a ground-spring and check the output noise (figure 6). It is essential to use the ground-spring, because the ground wire of the oscilloscope probe can absorb a lot of common-mode noises, especially in such measurements. Figure 6. ...
   .. main differences between the first prototype (my tested board) and the last PCB/Schematic are some modifications in the PCB design and component placement/values. For the first prototype, the output capacitor is only 22 µF-35 V. So I ...
   Mar 18, 2026
3. 3V sweeping siren alarm
   David A. Johnson
   Circuits Audio Oscillators Analog Devices LTC1799
   .. that those devices demanded much higher current than he wanted to use. I gave this problem some thought and came up with a design in Figure 1. Figure 1. Schematic diagram. The circuit uses a LTC1799 precision frequency generator from ...
   Mar 17, 2026
4. 555 VCO revisited
   Uwe Schüler
   Circuits Oscillators Texas Instruments TLC555
   .. of the square wave output voltage to the triangle voltage over C, which rises in frequency, is described in my recent Design Idea (DI), “Wide-range tunable RC Schmitt trigger oscillator” ( Ref. 2 ). There, I use a ...
   Mar 13, 2026
5. Newer, shinier DMM RTDs. Part 1
   Nick Cornford
   Circuits Measurement Microchip MCP6002
   .. two-part Design Idea (DI) follows on from a couple of previous articles relating to 100-Ω platinum resistance temperature ...
   Mar 13, 2026
6. 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
7. 5 A adjustable digital DC load
   Hesam Moshiri
   Circuits Arduino Measurement Supply Microcontrollers Usage Atmel ATmega328
   .. programming interface for the microcontroller (GND-RST-MISO-MOSI-SCK). PCB layout Figure 2 shows the PCB layout of the design. It’s a two-layer PCB board and contains a mixture of SMD and through-hole components. Figure 2. PCB ...
   Feb 27, 2026
8. Simple shorts sniffer
   Stephen Woodward
   Circuits Measurement Printed Circuit Boards (PCB) Texas Instruments TLV9052
   .. The current return side of B consists of the (approximately) known resistance (44 mΩ) of a 41-inch length of 24 AWG copper wire. The resulting 44 mΩ × 0.05 A = ~2 mV drop provides a null reference for the A1a voltage to current ...
   .. frequent and favorite contributor Nick Cornford gave us a cool and novel acoustic-interface design for a super sub-ohmmeter capable of audibly sniffing out defects in PWBs: “Tuneful track-tracing” ...
   Feb 25, 2026
9. Silly simple supply sequencing
   Stephen Woodward
   Circuits Supply Texas Instruments CD40106B
   .. contributor R. Jayapal recently shared an interesting Design Idea (DI) for power supply control and sequencing in MCU-based applications that combine analog and digital ...
   Feb 23, 2026
10. Self-oscillating sawtooth generator spans 5 decades of frequencies
    Christopher Paul
    Circuits Oscillators Analog Devices ADA4891-1 LM4041 LT1720
    .. U 2A . The comparator’s other input’s voltage causes its output to transition low when the sawtooth rises to 1 volt. U 2A , R 1 , Q 1 , R 8 , C 1 , and U 2B produce a 100 ns one-shot signal at the output of U 2B , which drives ...
    Feb 16, 2026

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