Circuits & Schematics: 10 - 5

41. How to collect free energy from atmosphere
    Swagatam Majumdar
    Circuits Bad Prescriptions Supply
    .. energy collector circuit helps to convert surrounding radio frequency waves to electric power and can provide 40 watts to 10 watts indefinitely. The circuit concept An option to increase the output power is achievable through proper set-up of ...
    Jan 15, 2025

42. PWM power DAC incorporates an LM317
    Stephen Woodward
    Circuits Supply Fairchild LM317
    .. 1. LM317 regulator melds with HC4053 CMOS switch to make a 16-W PWM power DAC. CMOS SPDT switches U1b and U1c accept a 10-kHz PWM signal to generate a 0 V to 9.75 V “ADJ” control signal for the U2 regulator via feedback ...
    Jan 14, 2025

43. Capture 16-bit readings of 8 thermistors in less than 1 second for $2
    Stephen Woodward
    Circuits Measurement Signal Processing, Filters Texas Instruments CD74HC4051 CD74HC4053
    Figure 1 is a cheap and cheerful voltage inverter I offered awhile back in “A simple, accurate, and efficient charge pump voltage inverter for $1” ( Ref. 1 ). Figure 1. The generic and versatile xx4053 provides the basis for a cheap, ...
    Jan 14, 2025
44. High-side current amplifier forms 28 V circuit breaker
    Circuits Supply Maxim MAX4374
    .. at CIN1 is 600 mV, so a resistor-divider with ratio 6.5:1 is the target value. Choosing R4 at 68 kΩ and R5 at 10 kΩ yields an actual load-current threshold of 936 mA, which is close enough for this application. If the load ...
    Jan 13, 2025
45. An ultra low distortion oscillator with THD below -140 dB
    Vojtech Janásek
    Circuits Oscillators Measurement National Semiconductor LME49710
    .. in the 20 Hz-30 kHz band is 1.7 µV. That gives a theoretical SNR (signal-to-noise ratio) of 126 dB for output level 10 V PP , or 3.5 V RMS . The LM49710 has voltage-noise density of 2.5 nV/√Hz. Resistors and input noise currents ...
    Jan 10, 2025
46. 2 GHz active probe. Part 2
    James Wilson
    Circuits Measurement Texas Instruments BUF802 OPA140 TPS7A39
    .. In other cases, particularly R α 2 in the following section’s schematic and the BUF802 input bias resistor (10 MΩ, not shown in the basic schematic), there is no frequency compensation in the design. For a 0402 package, a ...
    Jan 9, 2025
47. 2 GHz active probe. Part 1 - Searching for solutions
    James Wilson
    Circuits Measurement Texas Instruments BUF802 OPA140 TPS7A39
    .. carefully chosen compensation capacitors, yields a flat, wideband response. These methods have their limits, which mean 10× passive probes can achieve a few hundred megahertz of bandwidth and have an input capacitance of 10 20 pF. ...
    Jan 9, 2025
48. Resistive dummy load draws constant current from 1.2 to 50 V
    John Guy
    Circuits Measurement Supply Analog Devices MAX480 MAX6006A
    .. dummy-load circuit has been in use at Maxim for more than 10 years (see the Figure 1). It's useful for testing power supplies and power amplifiers as well as drivers for ...
    Dec 26, 2024
49. 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
50. Synthesize precision bipolar Dpot rheostats
    Stephen Woodward
    Circuits Analogue Design Microchip MCP4131 TN0104 TP2104
    .. Nevertheless, significant crossover distortion can be expected to creep in for low signal amplitudes and frequencies above 10 kHz or so. Design equations are unchanged from Figure 2. Materials on the topic Datasheet Microchip MCP4131 Datasheet ...
    Dec 17, 2024

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