This circuit of starting lights for auto-race was found in an English documentation from the 80's. The LEDs must be of different colors, for greater realism.
This biestable vox circuit was found in an old documentation. The circuit makes use of components of...
This circuit generates a triangular signal whose frequency is given by the basic components. The...
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...