Suggested by Linear Technology in an old documentation, this circuit produces 60 Hz rectangular pulses from the power grid. The circuit is free of noise.
Found in old American documentation, this circuit can divide the frequency of a signal by 2 or 3...
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...