This circuit identifies the polarity of DC signals and if the signal is AC. The circuit is from 1969 US EDN documentation. Operational may be equivalent.
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
This circuit is from a documentation from the 70s. Thus, the original transistor no longer exists,...
In this circuit, the LED Will blink in a presence of na áudio signal in the input. Gain is...