Circuits & Schematics: Design - 2

11. RS-232 meets voltage-to-frequency converter
    Stephen Woodward
    Circuits Measurement Interfaces Texas Instruments CD4053B
    .. into via standard RS-232 output signals (e.g., RTS and TxD) and used to power attached analog and digital circuitry. This design idea (DI) does exactly that by using asynchronous RS-232 to power and count pulses from a simple 10-kHz ...
    Nov 19, 2024

12. Precise photovoltaic I-V characterization
    Aaron Schultz Catherine Chang Henry Surtihadi
    Circuits Measurement Analog Devices LTC2058
    .. voltage (V OC ), as long as they do not consume an appreciable amount of current relative to the module I SC . In this design, current through R1 and R2 contributes an error of 19 µA, or 0.0038% of I SC . Figure 4. PV capacitive ...
    Nov 6, 2024

13. 80 MHz VFC with prescaler and preaccumulator
    Stephen Woodward
    Circuits Measurement Analog Devices LT1027
    .. parts count) than the King’s? It’s partly the self-compensating TBH diode charge pump described in an earlier Design Idea: “Take-back-half precision diode charge pump” ( Reference 2 ). It also gets help from AC ...
    Oct 28, 2024
14. DC-accurate, 32-bit DAC achieves 32-bit resolution
    Stephen Woodward
    Circuits Measurement Analog Devices AD586 LTC1151
    .. ppm, or 23 bits. The precision of the AD586L 5 V reference, which is 500 ppm untrimmed, limits absolute accuracy. If your design requires greater accuracy, then you can use an Analog Devices simple trim circuit to further tweak it. ...
    Oct 21, 2024
15. To press on or hold off? This does both
    Nick Cornford
    Circuits Analogue Design Supply Texas Instruments CD4060B
    .. rather than a toggle/rocker/slide thingy, which may be cheap and reliable, but would look so last millennium. This design idea (DI) shows how to transform a basic momentary push or tact(ile) switch into a latching bi-stable device. ...
    Oct 16, 2024
16. Hack into a stopwatch to make a phototimer
    Ralf Kelz
    Circuits Measurement Beginners Everlight PD333-3C/HO/L2
    .. exposure tester in this Design Idea measures the on time of a light source, whether an LED, an incandescent lamp, a halogen lamp, or another ...
    Oct 15, 2024
17. Comparator directly controls power-MOSFET gate
    Peter Demchenko
    Circuits Analogue Design Texas Instruments LM193 LM7815
    .. for this hysteresis-isolation circuit to work. It would be incompatible with a totem-pole-output IC. Figure 3. The internal design of the LM193 comparator requires that you keep the input pins 2 V below the positive rail. Materials on the ...
    Oct 14, 2024
18. Improved PRTD circuit is product of EDN DI teamwork
    Stephen Woodward
    Circuits Measurement Diodes AP4310A
    .. I published a simple platinum resistance temperature detector (PRTD) design idea ( Reference 1 ) that was largely inspired by a deviously clever earlier DI by Nick Cornford ( Reference ...
    Oct 10, 2024
19. The power of practical positive feedback to perfect PRTDs
    Stephen Woodward
    Circuits Analogue Design Measurement Microchip LM4040
    .. contributor Nick Cornford recently published a delightfully clever design idea ( Reference 1 ) using a platinum RTD calibrated to output a 1 mV/ C signal that’s perfect for ...
    Oct 1, 2024
20. 20MHz VFC with take-back-half charge pump
    Stephen Woodward
    Circuits Measurement Texas Instruments SN74AC14 TLV9161
    .. (without K. Kong’s complexity) is (mainly) the self-compensating TBH diode charge pump described in an earlier design idea: “Take-back-half precision diode charge pump” ( Reference 2 ). We’ll get to that ...
    Sep 30, 2024

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