This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
Using a 741 op amp with symmetrical source, this circuit was found in a 1982 documentation. The...
We found this circuit in a Popular Electronics of the 90s. The circuit can also be used as a seat...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...