This circuit was found in a 1970 IEEE publication. The circuit functions as a voltage controlled variable resistor and can be used with audio signals. Transistors admit current equivalents.
Found in Maxim documentation from the 90s, this circuit makes use of components from the period. The...
Found in an English Maplin magazine in 1983, this circuit has an RIAA equalization. We suggest its...
In the figure we have a way of obtaining a 13,2 V with current up to 5 A using an integrated 7812...