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Datasheets (data sheet) Search Index for Electronic Components (ICs, transistors, diodes, sensors, relays, etc.) |
Search: CD4093
Search " CD4093" on other search engines: GoogleCD4093Information on: CD4093- Multiple Remote Points Control On/Off Switch
Sometimes, you need to remotely turn on or off a two-state system, such as a light, from multiple points. You could connect simple pushbutton switches in parallel to a single-line bus. However, if the bus simply controls a toggle flip-flop, the system must know its current state to positively ensure the new, desired state. For example, if you want to make sure the light is on, you must have visual or electrical feedback via a second line before deciding whether to toggle the flip-flop. Also, ... - Circuit monitors ac-power loss
Dennis Eichenberg EDN The circuit in Figure 1 provides a simple, nonvolatile means of monitoring critical ac-power failures. Monitoring the power is important in such systems as heating and refrigeration, in which damage can occur if the ac power goes down for an extended period. The circuit in Figure 1 requires little power from the ac-power system. The quiescent battery current of approximately 5 µA provides long battery life in this application. The optocoupler consists of a neon lamp ... - Single-button lock provides high security
Maxwell Strange EDN Figure 1 is the block diagram of an easily programmed, single-button combination lock. You operate the lock by using a series of short and long pulses from a momentary switch that masquerades as a doorbell button. The circuit uses inexpensive CMOS logic. The retriggerable timer, T 1 , locks out entries made after the T 1 code-entry window, thereby greatly enhancing security. The circuit in Figure 2 operates as follows: The Schmitt-trigger quad NAND gate, IC 1 , debounces ...
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