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

1. Tune 555 frequency over 4 decades
   Stephen Woodward
   Circuits Oscillators Texas Instruments LMC555
   .. minimize the effects of loading from making further contributions to instability. Nevertheless, the strong suit of this design is definitely its dynamic range. Precision? Not so much. Materials on the topic Datasheet Texas Instruments ...
   Jan 29, 2026

2. FM receiver/radio using Arduino and TEA5767
   Hesam Moshiri
   Circuits Arduino Microcontrollers Usage Radio TSC TS2937 TS2940
   .. I used the SamacSys component libraries (for IC1 and IC2) in this PCB project as usual. It saves a lot of time and prevents design mistakes which leads to a lower product cost. All SamacSys component libraries (Schematic symbols, PCB ...
   Jan 22, 2026
3. Combine two TL431 regulators to make versatile current mirror
   Stephen Woodward
   Circuits Analogue Design Supply ON Semiconductor TL431 TLV431 NJW21193G
   .. designs for current mirror circuits have been an active topic recently here in Design Ideas (DIs). Usually, the mirror designer’s aim is to make the mirror’s input and output currents ...
   Jan 22, 2026
4. Ignoring the regulator's reference redux
   Christopher Paul
   Circuits Analogue Design Supply Texas Instruments OPA2383 REF35 SN74AC04 TLV9151
   .. R 4 in response to an input change. V OUT now settles to ½ LSbit of a 16-bit source in 2.5 ms. Changing C 3 to 510 pF (10% COG/NPO) reduces that time to 1.4 ms. Smaller values of C 3 provide little further advantage. The V OUT ...
   .. the output of A1 react to this while driving a hypothetical U1, which is capable of producing an anomaly-free ( Ref. 4 ) 0-volt output. Figure 3. V OUT and A1’s output from Figure 1 react to a step change in V DAC . Even though V OUT ...
   .. Woodward’s “Ignoring the regulator’s reference” ( Ref. 1 ) Design Ideas (DI) (see Figure 1) is an excellent, working example of how to include a circuit in the feedback loop ...
   Jan 21, 2026
5. SCR topology transmogrifies into BJT two-wire precision current source
   Stephen Woodward
   Circuits Supply Fairchild LM317
   .. frequent Design Idea (DI) author Christopher Paul showcased an innovative and high performance true-two-wire current source using a depletion mode MOSFET as the pass device in “A precision, voltage-compliant current ...
   Jan 15, 2026
6. Tuneful track-tracing
   Nick Cornford
   Circuits Measurement Printed Circuit Boards (PCB) Microchip MCP6002
   .. be an overstatement, but just like the original PLVCO, this can be used to play tunes! A length of suitable resistance wire stretched between a couple of drawing pins should be a good start now, where’s that half-dead wire-wound ...
   .. being generated by Q4/C3/R13. (For more informative details of the circuit’s general operation, see the original Design Idea [ 1 ].) The ’scope traces in Figure 2 should clarify matters. Figure 2. Waveforms within the ...
   Jan 12, 2026
7. Simple speedy single-slope ADC
   Stephen Woodward
   Circuits Measurement Microcontrollers Usage Texas Instruments LM4041N TS5A3160
   .. and taken as its digital conversion. We recently saw an example contributed by Dr. Jordan Dimitrov to our own friendly Design Idea (DI) corner in “Voltage-to-period converter offers high linearity and fast operation” ( Ref. ...
   Jan 12, 2026
8. Ignoring the regulator's reference
   Stephen Woodward
   Circuits Supply Texas Instruments TLV9151
   .. control (via PWM or other source) of regulators is a popular design topic here in editor Aalyia Shaukat’s Design Ideas (DIs) corner. There’s even a special aspect of ...
   Dec 24, 2025
9. Read isolated digital signals without power drain
   Alfredo Saab
   Circuits Measurement Digital Texas Instruments MAX5048 MAX913
   .. circuit, if carefully built, is determined by T 2 's interwinding capacitance. Using the core specified, plus 24-gauge wire with Teflon insulation, the resultant interwinding capacitance is less than 0.2 pF. Acquisition delay from the ...
   .. voltage for the isolation barrier depends on the type of insulation used in the single-turn windings and in PC-board design and construction. Teflon or Kapton insulation, for example, allows a barrier voltage of several kilovolts. ...
   Dec 24, 2025
10. Two-wire precision current source with wide current range
    Stephen Woodward
    Circuits Analogue Design Supply Analog Devices LM4041
    .. interesting analog design problem is the precision current source. Many good designs are available, but most are the three-wire types that can be used as a positive (see Figure 1) or a negative (Figure 2) polarity source, but not both from ...
    Dec 18, 2025

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