This circuit consists of two stages that each shift 180 degrees the signal. The circuit was proposed by Siliconix in a 1966 publication. Equivalent FETs can be used.
This circuit is one of many that the reader can find in this section for testing crystals. The...
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
This circuit is from a Radio Electronics from February 1970. The circuit selects the input...