This circuit was found in a Radio Electronics magazine from June 1962. The circuit is for cars of the time with platinum ignition. The indication is made on an analog instrument.
This time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
This is the traditional configuration of a high-pass filter with an operational amplifier, such as...
Found in old American documentation, this receiver receives modulated infrared signals and...