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Here is a simple ANTI-THEFT ALARM AND HORN. It generates a loud alarm when there is an attempt of theft. When the intruder opens the door,... -
A circuit for monitoring supply voltages of ±5 V and ±12 V is readily constructed as shown in the diagram. It is appreciably simpler th... -
A 4-cell pack is a convenient, popular battery size. Alkaline manganese batteries are sold in retail stores in packs of four, which usually... -
Often, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day. Most commerci... -
Receiver interference is hardly an unknown problem among model builders. Preventive measures in the form of ferrite beads fitted to servo...