Found in a documentation from the 90's, this circuit uses only one integrated circuit. The resistors in series with the LEDs depend on the power that can be between 5 and 12 V.
This remote listening device was found in documentation from the 50's. The transistors used are...
Found in a 2005 Linear Technology application manual, this circuit provides outputs from a current...
Found in the September 1992 issue of Radio Electronics magazine. This circuit generates pulses that...