Rcf HDL20 · powered speaker
181 components · 26 parts identified · 4 photos. Tap a marked part to see what it is.
24 traced nets on this board are available to technicians. See plans
33078 isn't marked on this board.
| Designator | Part (number or value) | Description | Package |
|---|---|---|---|
| BR1 | - | bridge rectifier | |
| C68 | - | +10va electrolytic | |
| C84 | - | -8va electrolytic | |
| C86 | - | vdrive electrolytic | |
| C86 | - | vcc reg out filter cap | |
| C109, C110 | - | capacitor | |
| C115 | - | vcc reg in filter cap | |
| C121 | - | positive | |
| C132 | - | bootstrap filter capacitor | |
| CONN3 | - | pic programming header | |
| CONN3 | - | 9pin icsp programming header | |
| D17, D18, D21, D22 | U620TG MURD620CT | ||
| D19 | BAS16 | ||
| MOS5, MOS6 | STP20NK50Z | ||
| Q6 | - | npn bjt | |
| Q6 | - | monotable turns on this bjt to pull down ct(s21531 pin3) when voltage across cs resistors exceed threshold | |
| R40 | 10 ohm 3w | zobel resistor 10 ohm 3w | |
| R76 | - | zobel resistor 10 ohm | |
| U3 | IRS20955S | audio driver | |
| U3 | IRS20955S | woofer audio driver | |
| U4 | MC33078 | woofer pwm modulator opamp | |
| U6 | MC33078 | tweeter pwm modulator opamp | |
| U7 | IRS20955S | tweeter amp audio driver | |
| U7 | IRS20955S | tweeter audio driver | |
| U8 | MC33078 | opamp | |
| VR4 | - | ntc | |
| VR4 | NTC 2.5 132 | ntc thermistor | |
| - | crystal 12.288mhz | ||
| - | vdrive reg in electrolytic | ||
| - | -ldo in electrolytic | ||
| - | +ldo in electrolytic | ||
| - | negative | ||
| - | ac select jumper | ||
| - | zobel capacitor | ||
| - | zobel cap | ||
| - | ac detect optocoupler | ||
| - | main secondary capacitor | ||
| - | main secondary capacitor 470uf 100v | ||
| - | tentative probably for a fan. one pin is supplied by the parallel low voltage rectifiers and the other is controlled to gnd by the ba w33 collector. | ||
| - | parallel - | ||
| - | vcc rectifier | ||
| - | - low voltage reg in filter cap | ||
| - | + low voltage reg in filter cap | ||
| - | vcc reg | ||
| - | primary and boot winding | ||
| - | vdd digital power ceramic | ||
| - | 510 ohm | ||
| - | 0 ohm | ||
| - | bootstrap filter cap | ||
| - | vs resistor 4.7 ohm | ||
| - | 4.7 ohm | ||
| - | tweeter amp boot diode | ||
| - | in series with audio coupling capacitor 1k | ||
| - | input board interface | ||
| - | r2 of voltage divider, resistor across q6 base and gnd 46k | ||
| - | r1 of voltage divider 10k | ||
| - | between 555 pin3 and voltage divider 0 | ||
| - | across 555 power | ||
| - | 21531 power | ||
| - | series resistors supplying s21531 vcc | ||
| - | series resistors supplying 555 vcc | ||
| - | D boot | ||
| - | parallel current sense in series with transformer primary winding and resonant capacitor r033 | ||
| - | ac detect diode | ||
| - | ac detect opto. Goes to mcu | ||
| - | high side | ||
| - | low side | ||
| - | series ac detect | ||
| - | aux rectifier | ||
| - | zener across 555 vcc | ||
| - | C boot | ||
| - | primary positive cap | ||
| - | primary negative cap | ||
| - | positive and negative over current detectors | ||
| - | resonant capacitor | ||
| - | between ac det diode and opto | ||
| - | primary and aux winding | ||
| - | aux blocking diode | ||
| - | white ceramic capacitor | ||
| - | tentative front led connector | ||
| - | 20pin input/display board interface | ||
| - | dsp crystal | ||
| - | -vcc led | ||
| - | +vcc led | ||
| - | vdrive led | ||
| - | +10va led | ||
| - | -8va led | ||
| 107J | vdd filter smd tantalum capacitor 100uf 6.3v | ||
| 107J | vdd smd tantalum capacitor | ||
| 10uf 16v smd | audio coupling. MAL215375109E3 10uf 16v | ||
| 10uf 16v smd | audio coupling 10uf 16v | ||
| 10uf 16v smd | |||
| 10uf 16v smd | tweeter audio coupling 10uf 16v | ||
| 10uf 16v smd | woofer audio coupling 10uf 16v | ||
| 24LC256 | selfboot eeprom | ||
| 555 | |||
| 78m10 | + low voltage reg | ||
| 78m10 | |||
| 78M12G | |||
| 79M08G | - low voltage reg | ||
| 79M08G | |||
| ADAU1701 | dsp | ||
| ADAU1701 | dsp. Toolchain sigmastudio + usbi. MP0 to MP11: DSP_SIGNAL, DSP_PEAK, NTC_MOS_CH1, NTC_MOS_PSU, EQ_MODE, MP5, MP6, not used, not used,+HV_SENSE, SD_CH1, SD_CH2. addr0 and addr1 tied to gnd. adc0 0.38v, adc1 3.8v full-scale rms. | ||
| BA W33 | controls the connector above. | ||
| BA W33 | tentative ldo | ||
| ED 39 | parallel + | ||
| ED 39 | low amp boot diode | ||
| ES1D | bootstrap rectifier diode | ||
| GENERIC SWITCHING POWER TRANSFORMER | |||
| IRFB4229 | |||
| IRFB4229 | amp mosfet | ||
| IRS21531D | |||
| IRS21531D | self oscillating gate driver. vcc rt ct gnd lo vs ho vb. | ||
| LM317 | mcu and dsp vdd reg, vpic | dpak | |
| LM317 | vdd regulator, vpic | dpak to252 | |
| LMC555 | 555 timer monostable. Output pin3 goes to q6 through a voltage divider. | sop8 | |
| MC33078 | |||
| MURS160 | |||
| MURS160 | boot diode | ||
| PIC16F689 | mcu | ||
| PIC16F689 | mcu. Toolchain compilers xc8, sdcc. Programming software mplab, pk2cmd and hardware PICkit 3 or 4. Pinout: vdd, mp5, adau res, pic mclr, selfboot, dsp signal,dsp peak, ext i2s sense, front led, mp6, scl, sns ac psu, sda, led peak, led signal, led mute, led power, pgc, pgd, vss. | ||
| S20K275 | mov | ||
| STP20NK50Z | hs | ||
| STP20NK50Z | ls | ||
| STP20NK50Z | low side mosfet | ||
| STP20NK50Z | high side mosfet |
Marked, not identified yet: C116, C120, C125, C127, C143, C144, CONN3