Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 6

51. Tiny continuity tester
    David Johnson-Davies
    Circuits Measurement Microcontrollers Usage Microchip ATtiny202
    .. I've used a slightly larger battery, the CR1025, and a battery holder which gives a more reliable connection than the wire clip used on the original. The circuit drives the piezo speaker in bridged mode from two outputs, to make it ...
    .. button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch. Introduction I design many of my projects for my own use, and the original Continuity Tester is one of the ones I use the most, to ...
    Apr 16, 2026

52. Double-duty current loop transmitter
    Stephen Woodward
    Circuits Analogue Design Interfaces Fairchild LM317
    .. (or otherwise)-caused cable cuts, and differentiating them from normal open circuits, is critical. Evolving the circuit design for expanded functionality makes it even more valuable. It’s just part of the job. Every design ...
    Apr 15, 2026
53. Newer, shinier DMM RTDs. Part 2
    Nick Cornford
    Circuits Measurement Analog Devices OP177
    .. the first part ( Ref. 1 ) of this Design Idea, we saw how a cheap op-amp can give remarkably precise readings from an RTD. We also found that it was a ...
    Apr 8, 2026
54. 5-V ovens (some assembly required). Part 2
    Nick Cornford
    Circuits Supply Microchip MCP6002
    .. bad news. With a PNP Darlington, the collector can be at ground, give or take a handful of millivolts. (The fine copper wire used to connect the module to the outside world has a resistance of about 1 Ω per meter.) Q1 drops ~1.3 V and so ...
    .. the first part ( Reference 1 ) of this Design Idea (DI), we looked at simple ways of keeping critical components at a constant temperature using a linear ...
    Apr 7, 2026
55. Laser scanning microscope from Blu-ray player
    Doctor Volt
    Circuits Laser Microchip MCP6004
    DIY Laser Scanning Microscope made from a defective Blu-Ray Player. A Blu-ray player must be able to detect the microscopically tiny pits on DVDs in order to play back a film. Therefore, the question arises: Can a Blu-ray player also see other ...
    Apr 1, 2026
56. 1 MHz 555 VFC
    Stephen Woodward
    Circuits Measurement Texas Instruments LMC555 TLV9051
    .. converters and the 555 analog timer chip, and therefore a double obsession with VFCs based on the 555. In fact, my first Design Ideas (DI) submission (in 1974) was for a 555 VFC. It was not only published but also selected as the best DI ...
    Mar 27, 2026
57. 5-V ovens (some assembly required). Part 1
    Nick Cornford
    Circuits Supply STMicroelectronics TIP42A
    .. as both a sensor and a source of heat, but it is simpler. Figure 1 shows the schematic of a simple version needing only a 2-wire connection, along with two photos indicating its construction. It was slimmed down from a more complex but less ...
    .. ovens in this two-part Design Idea (DI) can’t even warm that leftover half-slice of pizza, let alone cook dinner, but they can keep ...
    Mar 26, 2026
58. 5 decade antilogarithmic PWM current source
    Stephen Woodward
    Circuits Supply Texas Instruments LMC555 LTC2066
    .. pages of Design Ideas (DIs) have recently been awash in a veritable cascade of designs for variable frequency oscillators ...
    Mar 26, 2026
59. 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
60. 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

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