LM1875 Amplifier circuit, LM1875 Power Amplifier
Keywords: LM1875, LM1875 circuit, LM1875 amplifier
The LM1875 uses the TO-220 package structure, such as a medium power tube, compact size, simple peripheral circuit, and large output power. The integrated circuit has an overloaded thermal and inductive load reverse potential safety work protection. LM1875 main parameters: voltage range: 16 ~ 60V static current: 50mma output power: 25W harmonic distortion: <0.02%, when="" f="1kHz," rl="8Ω," p0="20W" rated="" gain:="" 26db,="" when="" f="1khz" time="" working="" voltage:="" ±="" 25v="" conversion="" rate:="" 18v="" μs="" circuit="" principle:="" lm1875="" power="" amplifier="" plate="" consists="" of="" a="" highly="" low-controlled="" attenuated="" tone="" control="" circuit="" and="" lm1875="" amplifying="" circuit="" and="" three="" parts="" of="" the="" power="" supply="" circuit,="" and="" the="" tone="" portion="" is="" high="" and="" low.="" the="" attenuation="" type="" tone="" circuit="" is="" controlled,="" wherein="" r02,="" r03,="" c02,="" c01,="" w02="" constitute="" a="" bass="" control="" circuit;="" c03,="" c04,="" w03="" constitute="" a="" treble="" control="" circuit;="" r04="" is="" an="" isolation="" resistor,="" w01="" is="" a="" volume="" controller,="" and="" adjusts="" the="" volume="" of="" the="" amplifier.="" ,="" c05="" is="" a="" corrupted="" capacitor="" to="" prevent="" the="" effect="" of="" lm1875="" dc="" potential="" on="" the="" post-stage="" tone="" circuit.="" the="" amplifying="" circuit="" mainly="" employs="" 1875,="" r08,="" r09,="" c066,="" and="" the="" like,="" and="" the="" magnification="" of="" the="" circuit="" is="" determined="" by="" the="" ratio="" of="" r08="" and="" r09,="" and="" c06="" is="" used="" to="" stabilize="" the="" drift="" of="" the="" fourth="" foot="" of="" the="" lm1875,="" but="" there="" is="" a="" certain="" amount="" for="" the="" sound="" quality.="" the="" role="" of="" the="" c07="" and="" r10="" is="" to="" prevent="" the="" amplifier="" from="" producing="" low="" frequency="" self-excitement.="" the="" load="" impedance="" of="" this="" amplifier="" is="" 4="" →="" 16ω.="" string="" 6="" in="" order="" to="" ensure="" the="" sound="" quality="" of="" the="" power="" amplifier="" plate,="" the="" output="" power="" of="" the="" power="" transformer="" must="" not="" be="" less="" than="" 80w,="" the="" output="" voltage="" is="" 2="" *="" 25v,="" the="" filter="" capacitor="" uses="" 2="" 2200uf="" 25v="" electrolytic="" capacitors,="" the="" positive="" and="" negative="" power="" supply="" shares="" 4="" 2200uf="" 25v="" capacitance="" the="" two="" 104="" monolithic="" capacitors="" are="" high="" frequency="" filter="" capacitors,="" which="" is="" conducive="" to="" the="" sound="" quality="" of="" the="" amplifier.="" assembly="" and="" debugging:="" tool="" preparation:="" 20w="" iron="" iron="" one,="" preferably="" adjustable,="" if="" necessary,="" can="" contact="" the="" webmaster;="" one="" meter,="" sharp="" pliers,="" screwdriver,="" solder="" wire="" and="" pine="" several="" perfumes.="" preparing="" for="" welding:="" welding="" the="" jumper,="" reload="" the="" resistance,="" reinforcement="" capacitance,="" reloading="" flow="" tube,="" reloading="" potentiometer,="" and="" final="" welding="" lm1875,="" the="" lm1875="" is="" fixed="" to="" the="" heat="" sink="" before="" welding="" lm1875,="" otherwise="" it="" will="" be="" loaded="" the="" screws="" are="" difficult="" to="" play="" when="" the="" heat="" sink.="" the="" portion="" of="" the="" lm1875="" contact="" with="" the="" heat="" sink="" must="" be="" applied="" with="" a="" small="" amount="" of="" heat="" dissipation,="" so="" that="" heat="" is="" dissipated.="" when="" welding,="" you="" must="" pay="" attention="" to="" welding="" quality.="" for="" beginners,="" you="" can="" practice="" more="" times="" on="" the="" waste="" board,="" and="" then="" officially="" weld.="" debug:="" the="" debugging="" of="" this="" active="" board="" is="" particularly="" simple.="" after="" the="" board="" is="" welded="" to="" the="" electronic="" component,="" you="" should="" carefully="" check="" the="" board="" without="" welding,="" especially="" the="" polar="" electronic="" parts,="" such="" as="" electrolytic="" capacitance,="" bridge-type="" reactor,="" once="" soldered="" please="" pay="" special="" attention="" to="" the="" risk="" of="" burning="" gendensometers.="" connect="" the="" transformer,="" the="" output="" of="" the="" amplifier="" does="" not="" pick="" up="" the="" speaker,="" but="" the="" 10,000="" meter,="" preferably="" the="" number,="" the="" multimeter="" is="" placed="" in="" the="" dc="" *="" 2v="" file.="" power="" amplifier="" is="" observed="" to="" observe="" the="" reading="" of="" the="" multimeter.="" under="" normal="" circumstances,="" the="" reading="" should="" be="" within="" 30mv,="" otherwise="" the="" board="" should="" be="" turned="" off="" immediately.="" if="" the="" reading="" of="" the="" meter="" is="" within="" the="" normal="" range,="" the="" power="" amplifier="" plate="" function="" is="" basically="" normal,="" and="" finally="" the="" speaker,="" input="" music="" signals,="" upper="" power="" test,="" rotary="" volume="" potentiometer,="" volume="" size="" should="" change,="" rotate="" the="" high="" and="" low="" tone="" knob,="" speaker="" the="" tone="" changes.="" experiment="" worth="" a="" try:="" short="" circuit,="" use="" a="" multimeter="" to="" measure="" the="" dc="" potential="" of="" the="" lm1875="" output,="" see="" if="" it="" is="" within="" 30mv,="" then="" pick="" up="" the="" speaker="" for="" two="" hours,="" use="" a="" multimeter="" to="" measure="" the="" dc="" potential="" of="" the="" lm1875="" output="" terminal,="" see="" if="" the="" dc="" potential="" is="" within="" 30mv="" if="" so,="" the="" c6="" capacitance="" can="" be="" saved,="" so="" that="" this="" enlarge="" plate="" is="" a="" pure="" dc="" power="" amplifier.="">
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