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# 3 Way Active Loudspeaker eng

2017-12-23 05:29
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3-Way Active Loudspeaker

After the2-way active loudspeakercircuit, give a complete electronic section circuit of one 3-way active loudspeaker. The speaker?s choice will become from you, because the particular circuit has the driving possibility all almost trade loudspeakers. The choice that made in the crossover stage, is a 3-way crossover [Butterworth] with cut off -point frequencies 200HZ and 3500HZ, with slope -12dB/oct. These frequencies can change and adapted in your own speaker?s choice, using the calculation types ofFig.5. Exist the possibility is used other circuit crossover, as the circuit of3-way active crossover with slope -24dB/oct. The circuit crossover does not exist above in main PCB, but is contact with this via the plug J2A that is applied above in the J2B. This can become if in the place of J2A it?s placed a pinhead with 8 pin and PCB crossover put on above main PCB in form sandwich. It can however be placed in other point and with a flat cable to transport the signals and the voltages from J2A in the J2B. Power supply for?15V of the crossover circuits it?s found in main PCB. A point that I want to highlight is with regard to various in the calculation values precision and real values of resistors and capacitors. It?s good, if the component value does not exist in standard value to select a combination that us will give value near in theoretical and simultaneously to do the same and in the other loudspeaker, in order that the divergence is same. In the drawing exist parallel combinations resistors, and somebody?s from these are not used if they do not need. With the TR1-2 we adjust the level of high and mid speakers, if it needs.

 Part List[Fig.1]
 R1=47Kohms R19-20=47ohms C17-18=47uF 25V R2=1Kohms C1=2.2uF 63V MKT TR1-2=47Kohms trimmer R3=4.7Kohms C2=220pF IC1=TL071 R4-11-13-15-17=NC C3-4-11-12=100nF 63V MKT IC2-3=TL072-NE5532 R5-6=12Kohms C5-6-9-10=10nF 63V MKT J1=2pin conn. 2.54mm pin step R7-8=120Kohms C13=6.8nF 63V MKT J2A=8pin conn. 2.54mm pin step R9-10=220Kohms C14=3.3nF 63V MKT or 8 pinhead 2.54mm pin step* R12-14=10Kohms C15=33nF 63V MKT R6-18=33Kohms C16=18nF 63V MKT All Resistors is 1/4W 1% Typical specifications Input sensitivity 1Vrms Input impedance 47K High Pass filter 20HZ-:-200HZ Band Pass filter 200HZ-:-3500HZ Low Pass filter 3500HZ-:-20KHZ Slope -12dB/oct

The protection circuit from DC voltages [Fig.2] and  delay connection the speakers is the same with what exist in2-way active loudspeakerwhere exists and the relative description. They exist certain various, as has been added a detection stage of continuous voltages and a relay [RL2]. The contacts of RL1 connect the speakers the high and mid frequencies, the two contacts of RL2 are connected at the parallel and connect the speaker of low frequencies in the exit of IC7. Here exist also the stage of?15V supply for the crossover and suffices for each choice of crossover circuit.

 Part List[Fig.2]
 R1=470ohms 1W C4=10uF 25V IC1=4093 R2-3=1Mohms C5=1uF 25V IC2=7812 R4=22Kohms C6=4.7uF 25V IC3=7815 R5-21=33Kohms C7-8-10-11-13-14=33uF 63V IC4=7915 R6-8-16=15Kohms C9-12-15=22uF 16V Q1-2=BD678 R7-9-17=56Kohms C16-17=2200uF 25V Q3-4-5=BC550C R10-23-18=56Kohms C22-23=10uF 25V RL1-2=12V RELAY G2R2 [OMRON] R11-12-19=10Kohms D1-2-3-4=1N4002 J2B=8pin conn. 2.54mm pin step R14-15-20=3.9Kohms D5=8.2V 1W Zener J3B=3pin conn. 2.54mm pin step R22=1Kohms D6-7.....26=1N4148 J8A-B=2pin conn. 2.54mm pin step male-female C1=100uF 25V D27=Led 5mm C2-3-18-19-20-21=100nF 63V MKT BR2=BRIDGE RECT. 80V 1.5A All Resistors is 1/4W 1-5%

In theFig.3, exist the circuit of power amplifiers that drive the corresponding speakers. The choice are also here theSTK4044XIof SANYO with output power roughly 100W each one, power that consider that is very good for the drive the majority of speakers of trade, in high levels. The sound quality that produces is very good. The type choice with clueXIbecame because it has better and more modern internal designing, as regards types II and V. It can used also other types [BandV] without exists some problem. Filters RLF1?3 are made by a resistor 10R 3W that to around her we wrap roughly 30 coils in three layer, wire from cupreous insulated with diameter 1mm. The capacitors C66?. 69 are placed above in main PCB and near in the power amplifiers.

 Part List[Fig.2]
 R23-33-43-32-42-52=1Kohms RLF1...3=FILTER* See text C32-46-50=1nF 63V MKT R24-34-44=47Kohms C24-38-52=330pF C33-37-47-51-63-65=100uF 63V R25-26-35-36-45-46=100ohms C25-39-26-40-54=1uF 63V MKT C34-48-62=220uF 25V R27-37-47=1Kohms C53=2.2uF 63V MKT C35-36-49-50-61-64=10uF 63V R28-38-48=0.22ohms 5W C27-28-42-56-41-55=100pF C66-67-68-69=15000uF 63V R29-39-49=4.7 ohms1W C29-43-57=100pF IC5-6-7=STK4044XI* See text R30-40-50=56Kohms C30-44-48=15pF F2-3=Fuse 5A Fast 5X20mm PCB case R31-41-51=10Kohms C31-45-59=100nF 100V MKT J4A-5A-6A=2pin conn. 3.96mm pin step Typical specifications Input sensitivity 1Vrms Input impedance 47K Output Power  (0.1% THD) 100W/8 ohm per Band Power Supply ?53V Block Diagram

In theFig.4, appear a big part of various stages and connections between them. As it appears the speakers are placed in suitable wooden box. In his rear part of box and on a leaf of aluminum are placed the power transformer T1, the power bridge rectifier BR1, the switch S1, the main power plug JF1, fuse F1, the RCA plug JF2 and the indicative led D27. Transformer T1 has two outputsA=2X38Volts andB=2X15Volts. Bridge BR1 clinching above in aluminum so that it?s frozen. On a big heatsink clinching the IC5-6-7. In plug JF2 enter the acoustic low level signal from the preamplifier exit. Good it?s the crossover PCB it?s found far by the T1 transformer.

 Part List[Fig.2]
 T1=110-230Vac||A=2X38V  >350VA JF2=Female RCA Jack MID=MIDRANGE 8 ohms B=2X15V     30VA F1=FUSE 1.2A SLOW CASE WOO=WOOFER 8ohms BR1=BRIDGE RECTIFIER 400V 35A S1=2XON-OFF 15A Switch JF1=3pin male supply jack TW=TWEETER 8R

Fig.5--Crossover calculation

3-Way Active Loudspeaker - Main PCB  [88kb]
3-Way electronic crossover -12dB/oct - PCB  [24kb]
3-Way Active Loudspeakerin Greek

 Sam Electronic Circuits9/02
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