This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
The 2009 project is based on the integrated circuit9 LM317T, an adjustable regulator with 3...
This is a traditional 741 configuration with gain close to 100. We found it in the December 1972...
This differentiator for the positive front of the input signal can be elaborated based on any...