This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced with equivalents, only with care so that the doubles are exchanged for matched pairs.
This circuit is found in the Italian magazine Radio Elettronica, August 1975 issue. There is a...
This circuit charges a battery to power a flashlight at night. The circuit is from an English...
Although most common piezoelectric transducers have a reduction in performance at frequencies...