This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a tachometric sensor for feedback. The current was not indicated in the original documentation.
This circuit was obtained from a 1985 Electronic Desing. The circuit uses a Darlington which may be...
This high selectivity circuit for single tone decoding was found in 1970s documentation. The coil...
This circuit for analogue TV was found in an American 1980s documentation. The transistor can be any RF...