Mentor, Ohio 44060 - USA
Picture of circuit board
General Midi circuit board that implements WaveTable and FM music synthesis using the Yamaha OPL4-ML YMF704C-S / YMF704S with YAC516 chipset.
The OPL4-ML (YMF704-S) is a single-chip, FM-enhanced wavetable synthesizer designed for all PC audio platforms from add-in cards to motherboards, and all PC audio applications from games to desktop music.
The chip integrates a "wavetable-sample" ROM and General MIDI processor with a wavetable synthesizer and an FM synthesizer on a single chip. The standard General MIDI interface allows games to directly access wavetable sound.
OPL4-ML is a WaveTable synthesizer tht integrates OPL3 FM synthesis, General Midi Processor, and WaveTable ROM into a one chip, and complies with GM system level 1.
This circuit board measures 1.3" x 2.6" (32mm x 66mm) and has 26 socket header (2 rows of 13, 0.10" spacing). The socket header is the interface to the OPL4 and provides connections for +5v digital power supply, +/-12v analog power supplies, MIDI input, left and right line level audio output, and an active low reset. The MIDI connections is used to send MIDI commands to the OPL4 synthesizer
1 Dgnd nc 2 3 Dgnd MIDI 4 5 Dgnd +5v 6 7 Dgnd nc 8 9 Dgnd +5v 10 11 Dgnd nc 12 13 nc +5v 14 15 Agnd nc 16 17 Agnd +12v 18 19 Agnd AudioL 20 21 Agnd -12v 22 23 Agnd AudioR 24 25 Agnd /Reset 26
The circuit board has the YMF704 Yamaha OPL4 chip (100 pin SQFP) along wih the YAC516 Digital-To-Analog converter. The YAC516-E is a delta sigma modulation D/A covnerter with 8-times over-sampling filter in a 24-pin SOP package. The YAC516 takes the 16 bit 2's complement digital data (both Left and Right data) and converts the digital data to analog audio at 44.1Khz sampling frequency.
We are an original equipment manufacturer (OEM).
We are the original purchasers of this item.
This item is currently stored in our air conditioned humidity controlled facility.
||YMF704 / YAC516
||OPL4 Synthesizer board
||Printed circuit board asembly
||New (not pulls) never used
In original anti-static packaging
||WaveTable synthesis, MIDI interface
What we are selling is the circuit board assembly that contains the Yamaha OPL4 chipset (YMF704 and YAC516). This circuit board is ready to use by supplying the +5, +/-12v power supplies. Then you send MIDI commands to it and it supplies analog audio as an output.
For reference, here are datasheets for the two main devices:
Select this link for the YMF704 Data Sheet
Select this link for the YAC516 Data Sheet