This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at the time. The circuit is from a 1970 CQ magazine.
The UAA170 integrated circuit is no longer common in our market. With it it is possible to...
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This double time constant circuit for resistive loads was found in documentation from the 1980s. The...