This simple low power triplicator was found in 90’s American documentation. The diodes can be general purpose types and the frequency is determined by the RC network of the 555.
Found in a 1967 American publication, this circuit with feedback for two transistors has a gain of...
This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the...
In the figure we have the way to implement the E (AND) function with two inputs, in the case of...