# MIDI IO board on LPC17
**URL:** https://forum.midibox.org/t/midi-io-board-on-lpc17/18503
**Category:** Parts Questions
**Created:** [August 13, 2014, 4:36pm UTC](https://forum.midibox.org/t/midi-io-board-on-lpc17/18503 "2014-08-13T16:36:27Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@EsotericLabs](https://forum.midibox.org/u/EsotericLabs)
#### Post date: [August 13, 2014, 4:36pm UTC](https://forum.midibox.org/t/midi-io-board-on-lpc17/18503/1 "2014-08-13T16:36:27Z")
Hello,
Looking at the schematic of the MIDI IO board for the STM32F4, I could not find a reason why it would not work as a a MIDI 3/4 extension for the older LPC17 core. Just wire J4B, J5.A6 and .A7 properly to the J1 of the new board (& gnd/5v).
Am I correct?
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### Author:  [@T.K](https://forum.midibox.org/u/T.K)
#### Post date: [August 14, 2014, 8:11pm UTC](https://forum.midibox.org/t/midi-io-board-on-lpc17/18503/2 "2014-08-14T20:11:26Z")
Hi,
yes, you can use the same board, but since LPC17 Tx pins are working at 3.3V level (and not in push-pull mode), you’ve to change some resistor values:
R3, R5, R8 and R10 have to be 47 Ohm.
And J1:Vd has to be connected to 3.3V
Best Regards, Thorsten.
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### Author:  [@EsotericLabs](https://forum.midibox.org/u/EsotericLabs)
#### Post date: [August 15, 2014, 6:42pm UTC](https://forum.midibox.org/t/midi-io-board-on-lpc17/18503/3 "2014-08-15T18:42:08Z")
Thank you!