This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is powered by 12 V and the power gain is 8.9 dB.
This logarithmic operational amplifier was found in the September 1994 issue of Electronics Now...
Indicated as a joke or challenge this circuit shows how it is possible to control two lamps using...
Found in a Linear Technology 80s integrated circuit manual this circuit has its gain controlled from...