This circuit was obtained in an American documentation from the 80's. The transistors can be equivalent to those indicated and the crystal can reach a few tens of megahertz.
November 2016 - New mCube MC3635 3-axis accelerometers with I2C and SPI interfaces in 1 to 16 g...
This circuit allows you to modify the resolution of a measurement bridge. It was found in the...
This circuit converts sinusoidal signals to square. The upper limit of frequency is abour 100 kHz...