This circuit was found in an Electronic Design from the 90s. The circuit uses a type J thermocouple that can measure from -50 to + 100º C. Power is provided by a 3 V lithium battery.
This simple circuit is a NOR gate simulated with LEDs and whose inputs are made using keys. To...
This interesting circuit in which the LED display is circular imitating a common clock appeared in the...
Found in an English documentation, this siren of good power is indicated for several applications, based on...