Obtained from a 1969 documentation, this circuit can operate at frequencies up to 500 Hz, counting up to 999. The circuit makes use of neon lamps of the time.
We found this battery monitor in a 2005 Linear Technology application manual. The circuit uses...
We found this circuit in a 70s publication. Transistors are general-purpose types of the time. The...
This circuit uses two oscillators to produce a sound that seems the sound of a ring-bell. The...