This amplifier step for small signals can use any general-purpose transistor like the BC548. The circuit can be powered by voltages from 6 to 12 V.
This simple circuit with SCR and unijunction transistor appeared in Radio Electronics magazine in July...
This circuit was found in an English magazine from 1977. The critical component is the gas sensor....
This circuit doubles the frequency of a rectangular signal applied to its input. The circuit has a...