This circuit, which can be used as a shield, was found in Radio Electronics from the 90s. The operating circuit can be replaced by a lower voltage equivalent.
This circuit monitors the state of a 12 V battery and can be used directly with one, or even in a...
Other operational amplifiers series, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
This circuit generates signals that can be adjusted in a small range around the frequency of the...