This circuit provides a 5 V negative voltage from a positive input voltage. Found in old American documentation, information on the used integrated circuit was not provided. Probably an oscillator.
This circuit for analogue TV was found in an American 1980s documentation. The transistor can be any RF...
The diagram shows a simple way to adjust a 7805 to have output voltages up to 12 V. The circuit is from...
It can be obtained from Mouser Electronics the new LM290xAQ operational amplifiers from Diodes...