Circuit Project Electronic

Having multiple extension telephones at home is very convenient. You can make or receive phone calls practically anywhere in the house. This circuit disables other telephones connected to the phone line whenever a telephone (either the master or any extension phone) is in use. The circuit is inexpensive and is guaranteed to keep the phone [...]

The intermittent wiper circuit shown above causes the auto’s windshield wipers to wipe
once every several seconds instead of constantly wiping. The circuit may be added to
older cars to provide the intermittent function or it may be used to replace broken wiper
circuits in modern cars.
Read more original source:
http://www.techlib.com/files/wiperkik.pdf

The Battery Saver is designed to prolong the battery life in small toys and devices by
disconnecting the load after a preset period. The two versions shown switch up to
one amp and give about one minute of operation before shutting off.
When the switch is pressed, the capacitor charges and the full battery voltage is applied
to the [...]