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4011B

Information on: 4011B

• Analog-to-digital frequency-dependent relays
  Mikhail Shustov, Tomsk The operation principle is described and the diagrams of analog-digital frequency-dependent relays, whose switching occurs when the certain setting valuation input frequency is exceeded by frequency, are given. Analog-digital frequency relays, considered in the article, are designed to respond to the executive or indicating device to exceed the specified limit value by the predetermined threshold controlled frequency. The undeniable advantage of such relays is that they ...
• Use LEDs as photodiodes
  The simple circuit in Figure 1, which can be powered with a 3.6 V nickel-cadmium rechargeable battery, lets you use an LED to detect light. The circuit consumes practically no quiescent power. Two LEDs act as photodiodes to detect and respond to ambient light. When ambient light is present, the upper LED, a small, red, transparent device covered with a black pipe, has a higher effective resistance than the lower, large, green LED. The voltage drop across the input of the NAND gate is less than ...
• Turn a set/reset latch into an astable/monostable multivibrator
  This Design Idea describes a simple way to form a reliable astable or monostable multivibrator from a set/reset latch. You may find it useful because it lets you minimize the number of standard digital ICs your design requires when absolute precision isn't an issue. You can use a set/reset latch either with active-low or active-high inputs, which you can build with two NAND or NOR logic gates. You can also use integrated set/reset latches or any type of flip-flop that comes with ...