Circuits & Schematics: Design - 7

61. Dual-coil relay driver uses only two MOSFETs
    Mehmet Efe Ozbek
    Circuits Supply Keysight Technologies N1810UL
    .. circuits for dual-coil relays. Drivers usually include logic elements to make sure to energize only one coil at a time. The design in Figure 1 uses only two MOSFETs to drive a dual-coil RF relay. The N1810UL RF switch has dual 24 V coils ...
    Sep 24, 2024

62. Brute force mitigation of PWM VDD and ground "saturation" errors
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments TLV9162 SN74AC04
    .. levels in response to the corresponding digital states. Sometimes however, as Christopher Paul observes in the cited design idea (Part 1 of a 4-part series), they don’t. The mechanism behind these deviations isn’t ...
    Sep 23, 2024

63. Switch mode hotwire thermostat
    Stephen Woodward
    Circuits Automation Analogue Design Measurement Supply STMicroelectronics TSB712
    .. recent EDN design ideas, we’ve seen thermostat designs that meld the functions of sensor and heater into a single device: ...
    Sep 18, 2024
64. 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
65. One-wire bus powers water-level sensor
    Dale Litwhiler
    Circuits Measurement Maxim DS2423
    .. 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
66. 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
67. 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
68. 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
69. 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
70. 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

Sort by: relevance / date