Circuits & Schematics: 10 - 7

61. Pocket-size white noise generator for quickly testing circuit signal response. Part 1 - Noise discussion
    Aaron Schultz Peter Haak
    Circuits Oscillators Measurement Linear Technology LTC2063
    .. Input sweeps can be composed of discrete input frequencies or a swept sine. Extremely low frequency sine waves (below 10 Hz) are difficult to produce cleanly. A processor, DAC, and some complex, precise filtering can produce relatively ...
    Nov 19, 2024

62. RS-232 meets voltage-to-frequency converter
    Stephen Woodward
    Circuits Measurement Interfaces Texas Instruments CD4053B
    .. circuitry. This design idea (DI) does exactly that by using asynchronous RS-232 to power and count pulses from a simple 10-kHz voltage-to-frequency converter (VFC). Getting only one bit of info from each 10-bit serial character may seem ...
    Nov 19, 2024

63. Negative time-constant and PWM program a versatile ADC front end
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments TLV9164
    .. with a (negative) time-constant of: Tc = (R 1 + (U2 on resistance)) C = (14.3 kΩ + 130) 0.001 µF = 14.43 µs = 10 µs/ln(2). Due to U1c’s gain = R 3 /R 2 + 1 = 2 the current through R 1 from V C : Thus, R1 is made ...
    Nov 18, 2024
64. DIY Soldering Station Analog Controller
    Валерий Бабанин
    Circuits Automation Measurement Supply Texas Instruments LM393
    .. 1). A heater (Rh) and a thermistor (Rt) are connected in series in the feedback circuit. The resistance Rh is approximately 10% of Rt and should not, it seems, greatly affect the switching threshold of the comparator. But this is only at first ...
    Nov 15, 2024
65. Preaccumulator handles VFC outputs that are too fast for a naked CTP to swallow
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments CD74AC161
    .. conversion to reset the INx bits to zero, along with a similar preload of the CTP bits. This would eliminate steps #6 and #10 of the conversion sequence. References Williams, Jim. Designs for High Performance Voltage-to-Frequency Converters. ...
    Oct 22, 2024
66. DC-accurate, 32-bit DAC achieves 32-bit resolution
    Stephen Woodward
    Circuits Measurement Analog Devices AD586 LTC1151
    .. performance, the circuit in Figure 1 is hard to beat. Its typical specifications follow: Resolution = 32 bits = 3 × 10 10 = 1.2 nV = 192 dB. DNL (differential nonlinearity) = 27 bits = 400 nV = 162 dB. INL (integral nonlinearity) = 22 ...
    Oct 21, 2024
67. To press on or hold off? This does both
    Nick Cornford
    Circuits Analogue Design Supply Texas Instruments CD4060B
    .. powered from the output, and oscillates at about 13.7 Hz at least, my sample did while the circuit is on. After about 10 minutes, its count reaches 8192 and Q14 goes high, charging C2 through D2 to turn Q3 on, and Q2 and Q1 off. Any extra ...
    Oct 16, 2024
68. CMOS gate makes long-duration timers using RC components
    Raju Baddi
    Circuits Oscillators Texas Instruments CD4011B
    .. CD4011 CMOS NAND gate has a typical input current of 10 pA at room temperature. You can charge a capacitor connected to the gate input with currents on the order of hundreds ...
    Oct 15, 2024
69. Improved PRTD circuit is product of EDN DI teamwork
    Stephen Woodward
    Circuits Measurement Diodes AP4310A
    .. excitation reduction from ~2.5 mA to 250 µA with an associated hundredfold reduction in self-heating from ~1 mW to ~10 µW and a proportionate reduction in the associated measurement error. The sixfold improvement in expected ...
    Oct 10, 2024
70. DC power wire also carries clock or data
    Mike Hardwick
    Circuits Interfaces Supply Texas Instruments LMC7211-N
    .. do not cause problems, as long as you choose the integrator components with care. The integrator RC product should be about 10 times the clock period. It’s convenient to choose R INTEG of approximately 1 MΩ when using CMOS ...
    Oct 3, 2024

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