Found in 1969 RCA documentation, this dimmer uses a dual time constant setting to achieve better control of the triac's trigger point.
This circuit is part of a sound system project published in the October 1970 issue of Radio...
In the figure we have an input circuit for a receiver in which conventional transistors were...
This mid-waveband wireless microphone was found in a Raytheon transistor manual from the 1960s. The...