Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 6

51. Switch mode hotwire thermostat
    Stephen Woodward
    Circuits Automation Analogue Design Measurement Supply STMicroelectronics TSB712
    .. that meld the functions of sensor and heater into a single device: FET, BJT, or even a simple length of fine gauge copper wire. A virtue inherent in thermostat designs that use a transistor as combined sensor and heater is that independent ...
    .. recent EDN design ideas, we’ve seen thermostat designs that meld the functions of sensor and heater into a single device: ...
    Sep 18, 2024

52. Digital pot can control gain over a 90 dB span like an electromechanical
    Stephen Woodward
    Circuits Amplifiers Analog Devices OP37
    .. short while back, I published a design idea ( Ref. 1 ) that uses a single linear pot to control the gain of a high performance OP37 decompensated ...
    Sep 3, 2024

53. One-wire bus powers water-level sensor
    Dale Litwhiler
    Circuits Measurement Maxim DS2423
    .. drives a DS2423 pulse counter. A host PC or µC reads the output of the pulse counter via the Dallas Semiconductor one-wire bus ( Reference 1 ). The circuit uses approximately 150 µA of current, allowing the circuit to steal its ...
    .. of these capacitors is 0.2 in. These dimensions provide a measurement range of 4 in. with a resolution of 0.2 in. This design uses 1 MΩ for the oscillator timing resistor, RC, because the timing resistance must be much larger ...
    Sep 2, 2024
54. An accurate resettable fuse
    Peter Demchenko
    Circuits Supply ON Semiconductor TIP32G
    .. fuse described in this design idea does not drop the connection, it simply limits the output current. A behavior that is similar to a ...
    Aug 14, 2024
55. Simple discrete SE-to-differential precision in-amp circuit: High common-mode input range and 50% less power
    Chau Tran Jordyn Rombola
    Circuits Analogue Design Measurement Analog Devices AD629 AD7685 AD8421 ADA4807-2
    .. is cost and performance competitive with monolithic instrument amplifiers. Figure 1 details the proposed precision system design to allow the user to measure differential signals in the presence of a high common-mode voltage. The circuit ...
    Aug 8, 2024
56. Synthesize precision Dpot resistances that aren't in the catalog
    Stephen Woodward
    Circuits Analogue Design Microchip MCP4141
    .. thus forming a precise programmable resistance. This relationship makes current I AB linearly proportional to N. Design equations are for appropriate resistances starting from specified R AB , R MAX , and R MIN are: Figure 3 ...
    Aug 7, 2024
57. Temperature compensated lead acid battery float charger
    Dave Conrad
    Circuits Supply Analog Devices LT1086
    .. effects. This can lead to loss of water and production of hydrogen gas, which can cause explosions or fires. Figure 1. The design provides constant charge current and temperature compensated float voltage with a small number of common ...
    Aug 5, 2024
58. Single supply 200kHz VFC with bipolar differential inputs
    Stephen Woodward
    Circuits Analogue Design Measurement Microchip LM4040
    .. VFC conversion times are defiantly difficult, but at least millisecond rates are definitely doable as shown in this design idea. Nearly four decades ago (in his Designs for High Performance Voltage-to-Frequency Converters), famed ...
    Jul 24, 2024
59. Voltage inverter design idea transmogrifies into a 1MHz VFC
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    It’s interesting, useful, and fun that basic electronic topologies often turn out to have utility in multiple and surprisingly different applications. Figure 1 shows an example of such a circuit. It’s a charge pump voltage inverter ...
    Jul 18, 2024
60. Precision programmable current source uses two ICs
    Pietro Oliva Stefano Salvatori
    Circuits Analogue Design Supply Analog Devices LT1991 LT1995 LT1996
    .. Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current ...
    Jul 17, 2024

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