This configuration was found in an American publication from the 90s. Operators admit equivalents just like transistors. The circuit does not require a symmetrical source.
This circuit is from a documentation for engineers from 1977. The circuit uses a large surface diode...
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...
Using the LM3914, this circuit is suitable for benchtop experiments. It was found in the March 1995...