Circuits & Schematics: Volt - 10

91. Memory-termination IC balances charges on series capacitors
    Clayton Grantham
    Circuits Supply Texas Instruments LP2996A
    .. imposes a self-discharge current of less than 1 mA, which represents a capacitor-battery discharge rate of 5000 sec per volt into an open circuit. You can reduce the LP2996's self-discharge current by applying an external control ...
    Jun 22, 2022

92. Simple circuit shuts off system when supply voltage is low
    Circuits Supply Microchip LM4041
    .. however, IC1’s “-” pin will be near ground when the voltage across R1 is less than 1.24 V, and about a volt below V+ when the voltage across R1 is greater than 1.24 V. Figure 1. This low-cost, space-saving circuit will ...
    Oct 13, 2022

93. Method sets voltage in multiple-output converters
    Robert Bell
    Circuits Supply onsemi MC33023 MBR2030CTL MURS120T3
    .. current only during its on time, and an internal resistive-voltage drop exists in the secondary output. Therefore, the volt-time product of the main transformer's secondary output is not exactly zero, which is a required condition ...
    Mar 8, 2023
94. Shannon decoder DAC meets UART
    Stephen Woodward
    Circuits Signal Processing, Filters Microcontrollers Usage Texas Instruments LMC555 TLV2371
    .. Figure 2 The SDD with 5V asynchronous serial data, similar to a µC UART output. Figure 2 illustrates an SDD for 5-volt asynchronous serial data of the sort a µC UART might output, and Figure 3 is its timing diagram. ...
    Jun 29, 2023
95. 5V powered, 0.0015% linearity, quartz-stabilized V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LT1461 LT1671 LT1884 LTC1043
    .. C temperature coefficient. A1 servo controls A2 FET switched current sink via clock synchronized flip-flop to maintain zero volt summing junction (Σ). Loop repetition frequency directly conforms to input voltage. In charge pump ...
    Aug 29, 2023
96. Low-cost precision adjustable current reference and application
    Stephen Woodward
    Circuits Measurement Supply Microchip LM4040
    .. Figure 1. Adjustable current sink with good precision and other desirable characteristics. To start with, a 2.5-volt voltage reference is produced by an inexpensive shunt regulator chip. The long-used and widely available (and ...
    Oct 19, 2023
97. "Sub-zero" op-amp regulates charge pump inverter
    Stephen Woodward
    Circuits Analogue Design Supply Texas Instruments TLV9064
    .. op-amp outputs “live” and below zero volts is a job where a few milliamps and volts (or even fractions of one volt) of regulated negative rail can be key to achieving accurate analog performance. The need for voltage regulation ...
    Feb 9, 2024
98. Double and invert 5 V to generate ±10 V using two generic chips and two bootstraps
    Stephen Woodward
    Circuits Analogue Design Supply Texas Instruments CD4053BE
    .. perfect supply regulation. It first doubles and then inverts 5 V to generate nominally symmetrical positive and negative 10-volt rails which can each handily supply several milliamps. The complete converter consists of two inexpensive generic ...
    May 23, 2024
99. Brute force mitigation of PWM VDD and ground "saturation" errors
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments TLV9162 SN74AC04
    .. circuits. Figure 2 is one practical possibility. Figure 2. A practical source for V+ and V- set R1 and R2 = 200k for ∆ = 1 volt. The Figure 2 circuit was originally described in “Efficient digitally regulated bipolar voltage rail ...
    Sep 23, 2024
100. 80 MHz VFC with prescaler and preaccumulator
     Stephen Woodward
     Circuits Measurement Analog Devices LT1027
     .. is about 18 mA at 80 MHz, which luckily the LT1027 reference is rated to handle. Just. Figure 2. Rail booster and 5.000 volt precision voltage reference. The 16x preaccumulator U2 allows use of microcontroller onboard counter-timer ...
     Oct 28, 2024

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