This diagram was found in the November 1972 issue of Radio Electronics magazine in an article describing benchtop equipment. The transistors are of the time and the frequencies are given by the coils.
This simple circuit can make use of any general-purpose transistor. The power comes from the...
This system of sequential lights for shop windows, discotheques, stores, does not use integrated...
This circuit was found in an American documentation of the 90s. Optical resources with the LDR as a...