This circuit was found in an American 1980s documentation. It analyzes the exhaust gas of a vehicle using a special sensor. The indicator is a milliamperimeter.
This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time...
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...
This is actually an automatic dimmer we find in an American 1980s documentation. The triac must be...