Found in an American documentation from the 90s, this circuit has a configuration that has been extensively explored in other articles on this site. The FET can be the MPF102 or equivalent.
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
This sensitive circuit detects the live pole of a power grid or outlet. The circuit makes use of a high...
This simple trigger circuit was found in a 90’s American documentation. The integrated circuit is...