Differences

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--- opl3_module_modified [2014/01/28 10:26] – eptheca
+++ opl3_module_modified [2014/01/28 11:40] (current) – eptheca
@@ Line 1: / Line 1: @@
 ====== MBHP_OPL3 module modifications, the 5V option ======
-The OPL3 module originally has three TL074 op-amps, and a circuit that needs +/-12V bipolar power supply.
+The [[http://www.ucapps.de/mbhp_opl3.html|MBHP_OPL3]] module originally has three TL074 op-amps, and a circuit that needs +/-12V bipolar power supply.
-In Wilba and nILS sammichFM, they use two OPA4348 rail-to-rail op-amps, that can be powered by 5V.
+In Wilba and nILS [[sammichfm|sammichFM]], they use two OPA4348 rail-to-rail op-amps, that can be powered by 5V.
-Sauraen suggested another 5V rail-to rail op-amp, the MCP6004, which is pin compatible with the TL074, and a way to modify the OPL3 module to use these.
+Sauraen suggested another 5V rail-to rail op-amp, the MCP6004, which is pin compatible with the TL074, and a way to modify the OPL3 module to use these.[[http://midibox.org/forums/topic/18492-mbfm-5v-option/]]
 - Replace R5,R7,R10 and R13 with jumpers\\
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 - Bridge C20 pads (to supply Ground for the op-amps)\\
 - Leave out bridges to IC6\\
-- Use MCP6004 for IC3 and IC5\\
+- Use MCP6004 for IC3 and IC5 (IC3 The op-amp, not the DAC, labeling error)\\
 - Supply 5V to the +12V pin, and Ground to Ground\\
@@ Line 27: / Line 27: @@
 - Connect the right pad of this bridge to the 5V pin in the middle of the board with a jumper\\
 - Connect the left pad of this bridge to the 5V pin of the Oscillator with a jumper\\
+- Two separate 5V voltage regulators, IN pins connected through a ferrite bead\\
+- One 5V source to Core and J1 of OPL3 module\\
+- The other 5V source to J3 of OPL3 module\\
+- Ground ONLY to J3!\\
+Tips:\\
+- Starlike wiring (Ground from PSU to each module + Audio outputs)\\
 I can vouch for these mods :)\\
-My MIDIboxFM has hardly any noise, and it has enough gain.
+My MIDIbox FM V1 has hardly any noise, and it has enough gain.
 {{:opl3.jpg?direct|}}
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