Power Failure Alarm (CB6116E)

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.

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Two Transistor Siren (CB4210E)
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
ONE-EVENT REGISTER (MIN031E)
This is a one-bit memory that can be used to store a simple bit of information, such as a remote...
Saw Tooth Generator Using na UJT (CIR809E)
This circuit using an Unijunction Transistor produces a 240 Hz saw tooth signal. The frequency...