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

31. Simple but accurate 4 to 20 mA two-wire transmitter for PRTDs
    Stephen Woodward
    Circuits Analogue Design Measurement Interfaces Analog Devices LM4040
    Accurate, inexpensive, and mature platinum resistance temperature detectors (PRTDs) with an operating range extending from the cryogenic to the incendiary are a gold (no! platinum! ) standard for temperature measurement. Similarly, the 4 to 20 mA ...
    Sep 2, 2025

32. Protect your boost converter
    T A Babu
    Circuits Supply XLSemi XL6009
    .. Usually a fuse, resettable or non-resettable, protects the system, but it is not always accurate or fast enough. This Design Idea shows a way to safeguard a boost converter from short circuits and reverse polarity application (Figure ...
    Sep 2, 2025

33. Micropower CMOS oscillator, draws only 0.5 µA
    David A. Johnson
    Circuits Oscillators Beginners Texas Instruments CD4007UB
    .. than necessary. The circuit shown generates a low frequency square wave signal while drawing only 0.5 microamps from a 6 volt supply. The circuit uses a number of N and P channel MOSFETs, contained within an inexpensive CD4007UB IC. The ...
    .. contained within an inexpensive CD4007UB IC. The circuit is inspired by a classic bipolar emitter coupled oscillator design and works in much the same way. The first N channel transistor is biased to the mid-supply point. The gate of ...
    Aug 31, 2025
34. A different twist to the power pushbutton problem: A kilowatt AC DAC
    Stephen Woodward
    Circuits Supply Power Texas Instruments CD4060B
    Design Idea (DI) contributors have recently explored various possibilities for ON/OFF power control using just a ...
    Aug 26, 2025
35. 25-kV generator tests insulation
    Lukasz Sliwczynski Przemyslaw Krehlik
    Circuits High Voltage Measurement Texas Instruments LM555
    .. zero (second part of the cycle). This circuit doesn’t tightly control this frequency, which isn’t a critical design parameter; the values in Figure 1 set the frequency to approximately 6 kHz. Q 2 , D 3 , and D 4 prevent V C1 ...
    Aug 26, 2025
36. Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
    Christopher Jarboe Thomas Mosteller
    Circuits Audio Supply Analog Devices LT8362
    .. that the required capacitors are both big and expensive. A second approach would be to increase the LT8362 output by a volt or two and add an LDO regulator to the output. This, however, requires a high-voltage LDO regulator, which ...
    .. up on bulk-output capacitor C4 to maintain equivalent performance. References Nelson, Carl, Application Note 19: LT1070 Design Manual. Analog Devices Inc., June 1986. Williams, Jim, Application Note 101: Minimizing Switching Regulator ...
    Aug 25, 2025
37. Why modulate a power amplifier? - and how to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM13700
    .. recently saw how certain audio power amplifiers can be used as oscillators ( Ref. 1 ). This Design Idea shows how those same parts can be used for simple amplitude modulation, which is trickier than it might ...
    Aug 20, 2025
38. Matchmaker
    Stephen Woodward
    Circuits Analogue Design Measurement Maxim MAX4053
    .. parameter for excitation symmetry) is reduced to a usually insignificant 10/10 5 = 100 µΩ. The component lead wire and PWB trace resistance will contribute (much) more unless the layout is carefully done. Matching resistors to ...
    Aug 19, 2025
39. A simulated 100-MHz VFC
    Jim McLucas
    Circuits Measurement Texas Instruments TLA431 SN74LVC1G14
    .. Woodward, a prolific circuit designer with way more than 100 published Design Ideas (DIs), had his “80 MHz VFC with prescaler and preaccumulator” [ 1 ] published on October ...
    Aug 19, 2025
40. Flip ON Flop OFF: high(ish) voltages from the positive supply rail
    Stephen Woodward
    Circuits Supply Texas Instruments CD4069UB
    .. seen lots of interesting conversations and Design Idea (DI) collaboration devising circuits for power switching using inexpensive (and cute!) momentary-contact ...
    Aug 11, 2025

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