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

51. Dual comparators match precision industrial, instrumentation application needs
    Tim Davis
    Circuits Analogue Design Measurement Texas Instruments LM359
    .. accurate pulse-width modulated (PWM) waveforms with very high ( 99%) and very low ( 1%) duty-cycle percentages. This design idea (Fig. 1) improves on designs based on the common LM311 and LT1011 devices, both of which require ...
    Apr 4, 2025

52. Versatile multistep resistor load bank is simple and modular
    Vijay Deshpande
    Circuits Measurement
    .. components. However, if a greater number of steps is required, two banks can be connected in parallel as the load bank design is modular. Using simple algorithms, it’s possible to program the load bank to generate resistance ...
    Apr 1, 2025

53. BJT muting switch
    Rod Elliott
    Circuits Audio Fairchild BC549 BC559
    .. where it's easier, cheaper and more convenient to use the circuits shown than to have to source relays, or to try to wire up CMOS switches for muting. While it is possible to use the ideas shown here for source switching, there will be ...
    .. but a little known technique that really doesn't look like it could ever work is to use bipolar transistors. The design shown here has extremely low distortion when turned off, and also has very little signal ...
    Apr 1, 2025
54. 100-MHz VFC with TBH current pump
    Stephen Woodward
    Circuits Measurement Texas Instruments CD74AC14 CD74AC74 CD74AC161 SN74LVC1G14 TLV9161
    .. analog designer and author Jim Williams published an awesome design in 1986 for a 100-MHz voltage to frequency converter ( Ref. 1 ). He named this high-climber (picture it on ...
    Mar 25, 2025
55. Can a free running LMC555 VCO discharge its timing cap to zero?
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    .. In fact, at the price of an extra resistor, it might be possible to improve linearity enough to pick up another half a volt and half an octave on both ends of the pitch range to span 177 Hz to 1410 Hz. See Figure 4 and Figure 5. Figure ...
    .. design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, ...
    Mar 24, 2025
56. A simple, purely analog -130 dB THD sine wave generator
    Christopher Paul
    Circuits Oscillators onsemi NE570 SA571
    .. recent Design Idea “Getting an audio signal with a THD 0.0002% made easy” [ 1 ] discloses a low THD sine ...
    Mar 7, 2025
57. Three discretes suffice to interface PWM to switching regulators
    Stephen Woodward
    Circuits Supply Microcontrollers Usage Texas Instruments TPS54332
    .. (N-2) T PWM /R 2 , where N is number of PWM bits and T PWM is the PWM period. Since C F will never see more than perhaps a volt, its voltage rating isn’t much of an issue. A cool feature of this simple topology is that, unlike many ...
    Mar 7, 2025
58. Simple setup tests bit-error rate
    Israel Schneiderman
    Circuits Digital Texas Instruments LM393 SN74HC74 SN74HC86
    .. you measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code, to the receiver under test. This Design Idea suggests an alternative method based on the use of a simple square wave. This method may not be superior ...
    Mar 4, 2025
59. 1 A, 20V PWM DAC current source with tracking preregulator
    Stephen Woodward
    Circuits Supply Microchip MIC2253
    .. design idea reprises another “1 A, 20 V, PWM controlled current source” ( Ref. 1 ). Like the earlier ...
    Mar 4, 2025
60. Design an RTD interface with a spreadsheet
    Robert S. Villanucci
    Circuits Analogue Design Measurement Analog Devices AD633 OP177
    .. the system is to achieve a high level of precision. One way to obviate the nonlinear characteristic of an RTD sensor is to design analog hardware to perform the curve-fitting mathematics before any additional signal processing occurs. This ...
    Feb 25, 2025

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