This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms output. Input impedance is 1 M ohm.
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
This circuit uses only passive components and must be tuned to the operating range. The circuit is...
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...