Circuits & Schematics Digital

Subsection: "Digital"
Search results: 42 Output: 1-10
  1. Common designs for touch switches detect a decrease in resistance when a user's fingertip either connects a contact to the circuit's common ground or supplies an injection of 60-Hz ac voltage, resulting from immersion in the electrostatic ...
    31-08-2022
  2. The control circuit in Figure 1 presents a relatively low input resistance and thus imposes a low value on external pulldown resistor R 1 to provide the desired low-level input voltage. In turn, R 1 wastes power by drawing a relatively high current ...
    16-08-2022
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  1. Interfacing two systems that operate at two arbitrary voltages is a challenging problem; there is no guarantee that one side operates at a voltage higher than the other side. Usually, the interface is an open-collector or open-drain type with just ...
    06-07-2022
  2. Many designs exist for logic-based astable multivibrators, one of the simplest being an RC feedback loop around a single inverting Schmitt trigger inverter (Figure 1). The output charges the capacitor to the upper switching threshold, at which ...
    27-06-2022
  1. The circuit in Figure 1 allows you to convert capacitance into a pulse train by using a constant current source and a linear monostable formed by two NAND-gate chips ( 74HC132 ). The circuit also provides two pulses to control external counter ...
    26-05-2022
  2. The performance of the watchdog circuit in Figure 1 may not match that of a dedicated watchdog circuit, but this circuit is helpful when the only watchdog in the lab doesn’t meet your design’s temperature requirement and when you are in ...
    10-05-2022
  3. Applications ranging from frequency counting and synthesis to sensor signal conditioning require conversion of RF signals to digital-logic levels. In such situations, designers typically use a high-speed voltage comparator to perform the ...
    09-11-2021
  4. In this Design Idea, we look at how electromechanical relays display hysteresis behavior that is surprisingly similar to the solid-state Schmitt trigger circuits, and how they can be used for many similar applications. This Design Idea is inspired ...
    22-08-2021
  5. Digital-system designs require you to consider many core voltages. Memory operates at 1.8 V, I 2 C and FPGA devices operate at 3.3 V, microcontrollers operate at 5 V, and charge-coupled-device image sensors operate at 9 to 8 V. Clocks for each ...
    01-06-2021
  6. The circuit in Figure 1 uses the LM358 dual op amp running as a comparator, plus a few other inexpensive components, to make a TTL (transistor- transistor-logic)/CMOS-logic probe. The circuit gets its power from the circuit under test, which lets ...
    08-04-2021