This circuit was obtained from an American documentation from the 1970s. Information on the current obtained and the winding of the transformer is not given.
With this circuit it is possible to activate a 12 V relay from a 6 V supply. The circuit operates as a...
This circuit was found in a 1991’s PE Hobbyst Handbook. The circuit is based on altering the sound...
This circuit with operational amplifier was found in old American documentation. It can be...