.. around doors and windows that cause energy leaks but can be used in many other ways, when a sensitive temperature change detector is needed. Two LEDs are used to signal if the temperature change is pointing above (Red LED) or below ...
Use this circuit to tell which game player presses a button first. Vasil Borodai The circuit in Figure 1 lets you indicate which game player presses a button first. Each button has a corresponding LED that indicates the pressing of the button. All ...
Detects the presence of a live mains conductor Minimum parts counting Circuit diagram: Parts: C1 100nF 63V Polyester or Ceramic Capacitor D1 Red LED (any type) IC1 4017 Decade counter with 10 decoded outputs IC P1 SPST Pushbutton B1 3V Battery (two ...
This circuit will detect power line currents of 250 mA or more without making electrical connections to the line. Current is detected by passing a line of alternating current through an inductive pickup (L1) as a screen diameter of 1 inch U-bolt ...
Kyle Holland EDN Every junction diode exhibits some degree of photosensitivity when it receives light comprising an appropriate range of wavelengths. The spectral response of a junction diode depends on a variety of factors, including material ...
.. mains voltage is approximately 0V, thereby dissipating only 200 mW at 230V and a 50-Hz input. Figure 1. This zero-crossing detector uses low-voltage parts and consumes little power. The circuit charges capacitor C 1 up to the limit that ...