Each 100n “X2″ capacitor (these are Mains rated capacitors) will deliver 7mA to each power supply (the 12v supply and the 5v supply). The only problem is the two supplies must be kept separate and no component can have a DC path from one supply to the other.
Each supply will deliver 21mA and obviously this [...]
If the constant-current circuit is not included, the current to the laser diode would drop as the battery voltage falls and the laser diode would cease to operate if the current falls below a certain minimum.
All “Laser Pointers” have an inbuilt constant current circuit to maintain the operation of the laser.
The output current in the [...]
The voltage between the output terminal and “adjust” is fixed a 1.2v (for this type of regulator). The 18R resistor in the circuit is called a voltage dropping resistor. It is designed to produce a voltage across it according to the current flowing. If it is 18R, the current flow will be: 1.2/18 = 66milliamps. [...]
Obsession Theme by Lorelei. Coded by Cheap web hosting and Hostmonster.
Featuring Liza Kliko's artwork in the header.
