Found in Philips' 1967 documentation, this circuit makes use of period components. The SCR can be of any type, depending on the power of the controlled load.
WWV is the prefix for the United States' time and frequency patterns station. These signals can be used...
This is 4-input audio mixer using an integrated circuit 741 and two more operational amplifiers....
This circuit is from a 1965 General Electric manual. It uses components from the time that admit...