Circuits & Schematics: Design - 2

11. THD-Enhanced Bias Circuit Design Targets Class AB Buffers
    Peter Demchenko
    Circuits Analogue Design Texas Instruments OPA2134
    Bias circuits for class AB buffers (Fig. 1a) can take several forms. One alternative (not necessarily the best) is usually called the “old V BE doubler” (Fig. 1b). Figure 1. The typical class AB buffer (a) can use a number of bias ...
    Feb 21, 2019

12. Design of an Adjustable Voltage Output Using a Push-Button Digital Potentiometer
    Thomas Brand
    Circuits Supply Analog Devices AD5116 ADCMP371 ADP121
    .. maximum and minimum switching frequencies and the operating voltage range of the AD5116 should be taken into account in the design of this filter. For the circuit shown in Figure 2, the switching frequency is in the range of about 1.8 Hz to ...
    Aug 27, 2020

13. Design a visible optical link for RS-232C communications
    Circuits Interfaces ON Semiconductor MC1488 MC1489
    .. design in Figure 1 is a visible optical link for those who need to see the transmitted data. An isolation figure of ...
    May 17, 2021
14. Battery automatic power-off has simpler design
    Yongping Xia
    Circuits Supply onsemi MC14093
    .. previous Design Idea describes a simple way to automatically turn off a battery after a preset on period to save battery life ...
    Nov 24, 2021
15. 1-IC design monitors ajar doors
    Fred Hicks
    Circuits Automation Beginners Texas Instruments CD4011B
    .. has the habit of not completely closing a drawer or perhaps the food freezer’s door you’ll appreciate this design. It senses an ajar door and, if the situation isn’t corrected within 20 sec, sounds a beeping alarm. ...
    Sep 6, 2023
16. Using an inductor to improve an existing design
    Peter Demchenko
    Circuits Supply Analog Devices ADR444
    Here is the circuit in Figure 1 from a previous DI ( Ref. 1 ): Figure 1. Simple local low-noise voltage converter that can be used when a simple negative supply of low voltage is required. It is simple, and its efficiency can be improved by a very ...
    Jan 31, 2024
17. 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
18. Low-noise ac amplifier has digital control of gain and bandwidth
    Philip Karantzalis
    Circuits Analogue Design Audio Analog Devices LT1884 LTC6910-1
    .. useful input-signal spectrum. The optimum combination of an amplifier's gain and bandwidth is the goal of a low-noise design. In a data-acquisition system, digital control of gain and bandwidth provides dynamic adjustment to ...
    Sep 5, 2020
19. Build a charge pump with ultralow quiescent current
    Circuits Supply Maxim MAX981 MAX4685
    .. pump. Until off-the-shelf options are available, it provides an alternative for designers seeking to implement a low-cost design without the use of inductors. Materials on the topic Datasheet Maxim MAX981 Datasheet Maxim MAX4685
    Nov 22, 2020
20. Discrete LED Color Organ
    Circuits Light Music
    .. newer type high intensity LEDs (3000 - 5000mcd) were used along with a very simple discrete transistor drive circuit. The design goals included small size and excellent portability, as well as long battery life. To begin, the required ...
    Nov 13, 2008

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