This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset current setting. The configuration can be adapted to operate with modern equivalent components.
Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The...
Although most common piezoelectric transducers have a reduction in performance at frequencies...
This circuit was obtained from a 1986 Spanish magazine Resistor. The magazine no longer exists, but...