More about alarm (136)

1-12-1976 | In most large towns and cities (for that matter, in many small ones as well!), the parking meter is a very familiar sight. Install...

1-11-1976 | This unit will sound the alarm if the door of a refrigerator is left open too long. Very few components are required for this effective...

1-07-1976 | This amplifier is intended to be used in conjunction with the popular Sennheiser stereo headphones (HD 414, HD 424). These headphones...

1-01-1976 | An alarm which gives its alarm signal at certain repetitive times, does not need to know what the actual time is. It is sufficient if it ca...

1-01-1976 | Low-cost domestic burglar alarms often operate on the loop principle. A number of normally closed microswitches protect points of ent...

1-07-1975 | The circuit described is one more addition to the variety of warning signals intended mainly for use in cars. It causes a warning signal...