Circuits & Schematics: 10 - 4

31. Improve thermal airflow sensor PSRR with just two resistors
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments LM10
    Self-heated transistors used as thermal air flow sensors are a particular (obsessive?) interest of mine, and over the years I must have designed dozens of variations on this theme. Figure 1 illustrates one such topology seen here (Reference 1) ...
    May 27, 2024

32. Simple circuit converts 5V to -10 V
    Ken Yang
    Circuits Supply Analog Devices MAX889
    .. inverts its input voltage and doubles the resulting negative output. Figure 1. This switched-capacitor inverter derives 10 V from 5 V. Normally, the MAX889T voltage inverter, IC 1 , converts a positive input to a negative output voltage ...
    Jun 10, 2024

33. 0 V to -10 V, 1.5 A LM337 PWM power DAC
    Stephen Woodward
    Circuits Signal Processing, Filters ON Semiconductor LM337
    .. 1. LM337 joins forces with 4053 CMOS switch to make a macho PWM DAC. Metal gate CMOS SPDT switches U1a and U1b accept a 10-kHz PWM 5v signal to generate a +1.25 V to 8.75 V “ADJ” control signal for the U2 regulator. ADJ = +1.25 ...
    Dec 2, 2024
34. Symmetrical 10 V, 1.5 A PWM-programmed power supply
    Stephen Woodward
    Circuits Supply Texas Instruments CD4053B
    .. that produce equal voltage outputs of opposite polarity, are even more so. Figure 1’s version of a symmetrical 0 V to 10 V, 1.5 A lab supply implements an extra handy trick: computer programming via a single PWM output. Figure 1. LM337 , ...
    Dec 26, 2024
35. Low-noise ac amplifier has digital control of gain and bandwidth
    Philip Karantzalis
    Circuits Analogue Design Audio Analog Devices LT1884 LTC6910-1
    .. input LTC6910-1, IC 1 , provides digital gain control from 1 to 100 using a 3-bit digital input to select gains of 1, 2, 5, 10, 20, 50, and 100. The circuit's lower 3-dB frequency is fixed and set to 1 Hz. A second LTC6910-1, IC 3 , is ...
    Sep 5, 2020
36. How I home-built an electricity producing Wind turbine. Part 3
    Circuits Wind Energy
    .. head unit I attached a 1 inch iron floor flange centered 7 1/2 inches back from the generator end of the 2X4, and screwed a 10 inch long iron pipe nipple into it. The nipple would slip into the top of the piece of conduit I'd use as a tower and ...
    Nov 10, 2009
37. Build a charge pump with ultralow quiescent current
    Circuits Supply Maxim MAX981 MAX4685
    .. larger than the actual load current. Though several inductor-based converters offer maximum quiescent current of less than 10 µA, designers usually prefer or require a regulated charge pump for cost-sensitive designs that must be ...
    Nov 22, 2020
38. Key-Glove. The Cheapest Wearable Keyboard on Earth
    Circuits Computers and Peripherals
    .. wrap wire from Radio Shack ($3) (Douglas J.A.R. Sasse suggested: doll house wire) 1 spool of black heavy duty thread ($ 1) 10+ plastic zip ties ($ 1) Directions fasten 13 male snaps to fingers of leather glove (4 each per first three fingers ...
    Nov 4, 2008
39. Solar day lamp designs use passive and active current-limiting circuits
    Vijay Deshpande
    Circuits Supply Light Solar STMicroelectronics TIP31C
    .. method of current limiting is to place a resistance in series with an array of LEDs. Typical specifications of a 12 V 10 W solar photovoltaic (PV) panel are as follows: Voltage at maximum power V MP = 17.4 V Current at maximum power I MP ...
    Jun 23, 2020
40. Embedded MP3 module. Part 2 - Configuration of the module, Software
    Circuits Audio Microcontrollers Usage
    .. memory. Timeout : defines the duration in milliseconds of time for entering the track number, the value can vary from 1 to 10,000 ms (default is 3000, ie 3 s). Parameters for Pin-to-Pin and Mixed mode: Time Wait Play and Time Wait Vol : are ...
    Oct 31, 2011

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