Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 3

21. 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

22. 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

23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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

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