Laboratory Type 0-50V 0-4A Adjustable power supply circuit The TL081 is a classic design based on the opamp .. I think I can remember the misconstrued diagram in the electrical or electronic... Read more
The PR4401 chip from Prema can be used to drive an LED directly, but not a high-power LED like one of the popular 1-watt types currently available on the market. The circuit shows that the d... Read more
Like the author you may keep some 12 V leadacid batteries (such as the sealed gel cell type) in stock until you come to need them. A simple way of charging them is to hook up a small unregul... Read more
Video fans and professionals in the field will find in this small signal distributor/amplifier an excellent ally when it’s necessary to distribute a single video signal across several equipm... Read more
This light dimmer has been especially designed for use with fluorescent lamps (FLs). The circuit contains only a few components and can be built on a circuit board of only 2 by 3 cm if you u... Read more
This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legis... Read more
The flash that is built into digital cameras is designed for indoor photography. At subject distances of greater than five metres or so, the light is usually not powerful enough to take a sa... Read more
Using rechargeable batteries to power circuits is a proven method for providing energy to mains-independent equipment. A major disadvantage of this is that the battery usually turns out to b... Read more
FSK Using 555-Timer The astable multivibrator with selective frequency input gives FSK Frequency Shift Keying. We may manually change the frequency through a potentiometer, but if it has to... Read more
This simple circuit drives DC motors with a maximum current of 1 A and can be built with readily available components. The output voltage is adjustable between 0 and 14 V and the polarity ca... Read more
