Circuits & Schematics: CHESS CLOCK - 2

11. High stability quartz stabilized V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LM199 LT1001 LT1011 LT1056 LTC1043
    .. lower gain drift. Figure 1’s circuit reduces gain TC to 5 ppm/ C by replacing the capacitor with a quartz-stabilized clock. Figure 1. Quartz-stabilized V-F. In charge pump-based circuits the feedback is based on Q = CV. In a ...
    Jul 30, 2024

12. RC-timed shutoff function uses op amp and momentary switch
    Glen Chenier
    Circuits Measurement Supply Texas Instruments LMC6482
    .. wire against a gold post, an almost no-cost and no-real-estate switch. Without a processor or a digital clock, the function uses a spare op amp and a handful of components (Figure 1). Figure 1. Employing an RC timer, this ...
    Jul 2, 2024

13. 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
    .. expression: V + = 10 V 180(I + + I ). Where: I + = +10 V output load current I = 10 V output load current The 25 kHz pump clock is provided by a “merged” oscillator consisting of U2b driven by positive feedback. From U2c ...
    May 23, 2024
14. Non-linear pullup for multi-rate I²C buses
    Christopher Paul
    Circuits Interfaces Microcontrollers Usage Texas Instruments SN74LVC2G66 SN74LVC74APWR TLV3202
    .. 2 C is a popular bidirectional serial communications bus having a clock and a data line. Both line’s drivers consist of an open drain ground-referenced N-channel MOSFET with a ...
    May 13, 2024
15. Efficient digitally regulated bipolar voltage rail booster
    Stephen Woodward
    Circuits Analogue Design Supply onsemi MC74AC132
    .. and regulation of bipolar beyond-the-rails voltages. Schmidt trigger oscillator U1a provides a continuous ~100 kHz clock signal to charge pump drivers U1b (positive rail pump) and U1c (negative rail). When enabled, these drivers can ...
    Apr 26, 2024
16. Rotary encoder mates with digital potentiometer
    Peter Khairolomour
    Circuits Digital Switch Channel RE11
    .. The AD5220 from Analog Devices is a 128- step, pushbutton digital potentiometer. It operates with a negative-edge-triggered clock, ∖CLK, and an increment/decrement direction signal, U/∖D. When B leads A (clockwise), the quadrature decoder ...
    Mar 29, 2024
17. Efficient voltage doubler is made from generic CMOS inverters
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC14
    .. cap C C to U2 with U2’s input clamps providing DC restoration. Figure 3. Complete voltage doubler: 100 kHz pump clock set by R1C1, Schmidt trigger, driver (U1), and commutator (U2). Consider the ONE half cycle of the square-wave. ...
    Mar 14, 2024
18. Voltage inverter uses gate's output pins as inputs and its ground pin as output
    Stephen Woodward
    Circuits Supply Texas Instruments SN74AC14 CD40106B
    .. is shown in Figure 3. It’s really not as complicated as it looks. Figure 3. Complete voltage inverter: 100 kHz pump clock (set by R1C1), Schmidt trigger and driver (U1), and commutator (U2). A 100 kHz pump clock is output on pin 2 of ...
    Mar 13, 2024
19. Control a processor's power supply in real time
    Yogesh Sharma
    Circuits Supply Microcontrollers Usage Analog Devices AD5258 ADP3051
    .. which power management is key, a microprocessor may adjust its core voltage corresponding to an increase or a decrease in clock speed, allowing full processing power when necessary but not wasting excess power when idle. The circuit of ...
    Jan 25, 2024
20. 0.05 µV/°C chopped amplifier requires only 5 µA supply current
    Jim Williams
    Circuits Amplifiers Analog Devices LT1495 LTC1440
    .. C chopped amplifier requires only 5 µA supply current. The micropower comparators (C1A and C1B) form a biphase 5 Hz clock. The clock drives the input-related switches, causing an amplitude-modulated version of the DC input to appear ...
    Dec 15, 2023

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