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

Standard conventional and circular fluorescent  lamps with filaments can be ignited easily and much  more quickly by using Thyristors instead of the mechanical  starter switch, and solid state Thyristors are more reliable. Thyristors produce a pure solid state igniting circuit with  no mechanical parts in the fluorescent lamp fixture. Also,  because the lamp ignites much faster, the life of the  fluorescent lamp can be increased since the filaments are  activated for less time during the ignition. The Thyristor  ignition eliminates any audible noise or flashing off and on  which most mechanical starters possess. Figure shows a circuit for igniting a fluorescent  lamp with 240 V line voltage input using Triac and DIAC  networks. Figure illustrates a schematic using a SIDAC phase  control network to ignite a 240 V ac fluorescent lamp. The one major  change is that two K2400E devices in series are used to  accomplis...

Use of RS allows low charging rates with fully charged battery. * * 1000 μF is recommended to filter out any input transients. Simple12V 3A battery charger schematic, The LM350 series of adjustable 3-terminal positive voltage  regulators is capable of supplying in excess of 3A over a  1.2V to 33V output range. Source: National Semiconductor

The Siemens IC SLB 0587 permits the design of digital electronic phase controls for operation of incandes-cent lamps, dimmer for low-voltage halogen lamps with in-series connected transformers, and universal as well as split-pole motors.  Dimmer for Halogen Lamps schematic diagram. In normal, resistive operation of a phase control circuit there is alternately part of the positive and negative line-voltage half cycle applied to the load via the triac that has started to conduct because of the trigger pulse. Operation of the circuit with a transformer and low-voltage  halogen lamp connected is largely identical to the operation of a normal filament lamp due to  the primarily resistive nature of the load. In operation with resistive and inductive portions of  load, the zero crossing of the current compared to that of the line voltage line is delayed. In operation with heavily inductive loads (eg an idling transformer after lamp failure), a highly  lossy state (h...