This interesting configuration was found in a 1965s Electronic Design. It makes use of components of the time.
This circuit is a mixer for video signals. We found it in a 90s Linear Technology documentation. The...
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...
May 2017 - Mouser Electronics announced the availability of the LMX2491 a new PLL for frequencies...