Schematics diagrams

The sealed subwoofer box is a better choice if space is extremely tight, but the ported subwoofer  box will produce 3dB more output at the same power if you have the extra space to work with. • The subwoofer box diy design project recommendations listed above  are external dimensions which assume the use  of 3/4" (19mm) thick material. If you are using  5/8" (16mm) thick material, subtract 1/4"  (6.5mm) from each dimension. Do not use any  material with a thickness of less than 5/8"  (16mm) as this may compromise the rigidity of  the enclosure. • All subwoofer box volumes listed above are net  internal volumes! Driver displacement, port  displacement and brace displacement must be  added to obtain the final gross internal volume.  All enclosure dimensions above have already  taken this into acount. • When using two subwoofers in a common  enclosure simply double the required volume  and, in the case of a po...

Many loudspeaker systems incorporate  PolySwitch devices for  overcurrent protection. By tripping  during high-current conditions and  resetting when no longer needed,  PolySwitch devices provide reliable  protection without the nuisance  and replacement costs  associated with fuses. The Problem Today’s speakers are generally  designed and sold independently  of amplifiers. Thus, mismatches  may occur, which can lead to damage.  Also, the advent of digital  recordings and compact discs  places extra burdens on sound  systems. Speaker damage can  result from a number of factors,  including the following situations: • High-power amplifiers used with  low-power speakers may simply  overdrive the speaker coils with  excessive power during sustained high volume. • Low-power amplifiers may be  overdriven so that clipping  occurs. This causes an upward  frequency shift of power...

Double-time-constant schematic diagram for Incandescent Light Dimming, Heat Control, and Motor Speed Control The schematic shown is a doubletime- constant circuit which has improved performance. This circuit uses an additional RC network to extend the phase  angle so that the Triac can be triggered at small conduction  angles. The additional RC network also minimizes any  hysteresis effect. Source: Power Thyristor application note, Littelfuse