We found this configuration in a 1974 publication. Transistors can be replaced with equivalents such as 2N2222. The circuit has a dynamic range of 60 dB.
The circuit shown by the figure below can produce signals in the range between 20 kHz and 30 kHz....
We found this circuit in an article in Electronics Now magazine from November 1997. The circuit uses...
The figure shows how to implement an OR function with two inputs, using a relay. The relay...