Circuits & Schematics: Design

1. Reduce EMI by sweeping a power supply's frequency
   John Betten
   Circuits Supply Texas Instruments TL331 UCC3813N-0
   .. path back to the noise source. The larger the noise, the greater the size, expense, and difficulty of the filter design. Power supplies that operate at a fixed frequency have their largest EMI emission at this fundamental, fixed ...
   Apr 22, 2025

2. Water-leak detector uses 9V batteries
   Yongping Xia
   Circuits Measurement Analog Devices MAX934
   .. previously published Design Idea describes a practical gadget that has the potential to save a lot with little investment ( Reference 1 ...
   Apr 18, 2025

3. Test technique quantifies jitter of discrete-comparator design
   Tim Davis
   Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
   .. colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the discrete comparator ...
   Apr 9, 2025
4. 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
5. 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
6. BJT muting switch
   Rod Elliott
   Circuits Audio Fairchild BC549 BC559
   .. 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
7. 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
8. Can a free running LMC555 VCO discharge its timing cap to zero?
   Stephen Woodward
   Circuits Analogue Design Oscillators Texas Instruments LMC555
   .. design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, ...
   Mar 24, 2025
9. 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
10. 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

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