Found in 1969 RCA documentation, this dimmer uses a dual time constant setting to achieve better control of the triac's trigger point.
Indicated for scanning circuit applications, we found this generator in a Radio Electronics from the 80s....
This circuit tests crystals up to a few megahertz with ease. The circuit is from a 1977...
Found in documentation from the 70s, this circuit uses an operational one from that time. It goes for...