Photos show this board type from our St Lucia workshop - ask us for photos of the exact board you'll receive.
Electro-voice ELX112P, ELX115p, ELX118P, ZXA1-SUB powered sub - power board
For the Electro-voice ZXA1-SUB powered sub · power board
This is the power board from the Electro-Voice ZXA1-SUB powered subwoofer. It is a switch-mode power supply that produces the DC supply rails for the subwoofer's built-in amplifier.
The supply is controlled by a TL494 PWM controller, which drives a half-bridge built around two STP17NK40ZFP MOSFETs. A 0.05 ohm current sense resistor monitors half-bridge current. A BCP56-16 transistor and a BZT52C12S 12V zener form the TL494's supply regulator. Other parts include two 820uF 200V radial electrolytic capacitors, MURA220 rectifier diodes, BC807-25, BC846BW, BC856B and KSP44 transistors, BAS316 and BAT54WS diodes, and a 5x20mm fuse.
Parts on this board
Components we've identified on this board - handy if you'd rather repair yours.
| Part | Position | What it is |
|---|---|---|
| 0.05 OHM 2512 | R49 | half bridge current sense reistor |
| 10 OHM 0402 | R41, R50, R51, R78, R79 | Thick film resistor, 10 ohms, 0402 surface mount package. |
| 220 OHM 0402 | R84, R85 | |
| 390 OHM 0402 | R23 | |
| 3B | T11 | pnp |
| 6B | T19, T21, T36 | npn aux switch. |
| 820UF 200V RADIAL 30X30 | C22, C23 | -vcc |
| BAS316 | D11, D18, D42, D43 | Switching diode, 100V 250mA, SOD-323 |
| BAT54WS | D24, D29 | Schottky diode array, surface mount, dual diode configuration. |
| BC807-25 | T20, T22, T23, T24 | half bridge ls gate discharge pnp |
| BC846BW | T25, T7 | current sense npn |
| BC856B | T13 | dtc driver pnp |
| BCP56-16 | T10 | be 639mv bc 637mv. tl494 npn vcc regulator |
| BZT52C12S | D17 | 12v zener for tl494 vcc regulator |
| GENERIC 5X20MM | ||
| GENERIC CERAMIC CAPACITOR | C34, C40, C41 | high side snubber |
| KSP44 | T14 | npn ebc |
| MURA220 | D5, D6 | |
| STP17NK40ZFP | T30, T31 | half bridge low side |
| TL494 | U1 |