This protection circuit trips by quickly blowing the fuse in the event of an overcurrent. The circuit is from a 1964 Electgronic Design. The transistor can be general-purpose.
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...
This simple SCR alarm circuit was found in an old Poptronics, but can be easily assembled as all...
This circuit is found in the Italian magazine Radio Elettronica, August 1975 issue. There is a...