BGW 750B & BGW 100 Clone - Class AB or TD - MOSFET Output Devices

Malta

Member
2020-01-22 11:53 am
Valetta
Somebody interested to clone and rebuild BGW 750A BGW 750B BGW100

with todays devices and small improvements ?

Gerber Files to share available


Scalable Class AB Output Power or Class TD with Rail Switcher Driver Board (under Development not ready)

Using Mosfet FDA69N25 Output Devices instead of Bipolar in Original design

+95 V DC Rail Class AB with 5 Pair FDA69N25 1000 W RMS

+70 V DC Rail Class AB with 2 Pair FDA69N25 for reliable operation

Attachment Schematic, PCB Layout & PCB 3D View small power Class AB 1 pair
FDA69N25

Improvements:
Crowbar DC Protect
DISPLAY Power, Signal and Clip, Clip Limiter
Cascoded for better linearity and speed
KSA1381 KSC3503 instead of MJE340 / MJE350 Devices
LM35DT Sensor for variable speed temperatur controlled Fan
 

Attachments

  • BGW750 MK1 Rebuild schematic.pdf
    39.1 KB · Views: 89
  • BGW750 MK1 Rebuild PCB.pdf
    186.1 KB · Views: 38
  • BGW 750 MK1 Rebuild 3D.jpg
    BGW 750 MK1 Rebuild 3D.jpg
    362.6 KB · Views: 138
  • BGW 750 MK1 Rebuild 3D-1.jpg
    BGW 750 MK1 Rebuild 3D-1.jpg
    244.6 KB · Views: 137

Malta

Member
2020-01-22 11:53 am
Valetta
BGW 750B Power Supply drops from +/- 86 V DC to about +/- 65 - 70 V DC at full output power. To drive bipolar Transistor output stage is safe and reliable, but its to less power.

BGW 750B redesigned +/- 95 - 110 V DC Rail - Class AB

5 pair N-Channel Switching Power Mosfets is safe and reliable also there is a huge improvement in sound clarity compare to slow bipolar transistors

Expected output power is 1000W RMS or 2000W Programm Power