This circuit was found in a British documentation from 1969. It can be implemented with modern transistors. The pass band is 6 MHz.
This 1995 circuit directly controls a triac. The triac, in turn, controls the external load. Times...
A divide-by-4 or two-bit binary counter can also be built using two flip-flops of the 4027 type as...
Using period transistors, this 10 W amplifier was found in Radio Electronics magazine from May...