This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can be replaced by a modern equivalent. The power supply must be symmetrical.
This circuit activates an incandescent garden, balcony or showcase lamp when it gets dark, turning it...
This circuit is from an old publication of 1972 but can be mounted with BC548 transistors for 12 V...
This circuit is intended for the testing of junction FETs, providing several reading options...