The purpose of this circuit is only to increase the input resistance of a multimeter, since there is no voltage gain. The batteries are 9 V and operational equivalents can be used.
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...