If you have a MIDI device which is not responding to the controller, this handy little unit will allow you to see whether MIDI messages are actually being transmitted. Every time a message is received, the LED will blink. There is also a MIDI Thru port, so this unit can be used in a MIDI chain. This is a very useful piece of equipment for anybody who works with MIDI instruments, and it is also fairly cheap to build. My total costs were less than £10.
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The following prices are taken from the website Bitsbox.co.uk. If you are in the UK I really recommend this website, as the prices are cheap and they charge a flat rate £1.50 for postage, regardless of order size.
| Part Description | Part Name | Quantity | Total |
| Resistor | 220 Ohm | 4 | £0.16 |
| Resistor | 1K | 1 | £0.04 |
| LED | 5mm Red | 1 | £0.09 |
| Voltage Regulator | 7805 | 1 | £0.28 |
| Quad 2-input NAND | 74LS00 | 1 | £0.38 |
| Opto-isolator | 6N139 | 1 | £0.79 |
| Switch | Miniature toggle switch | 1 | £0.67 |
| Connector | 5-pin 180° DIN socket | 2 | £1.18 |
| Battery clip | PP3 battery clip | 1 | £0.16 |
| Battery | PP3 9V battery | 1 | £0.59 |
| Plastic enclosure | 100x75x40 ABS enclosure | 1 | £1.94 |
| LED bezel | 5mm LED clip | 1 | £0.10 |
| Wire | 1m stranded core | 1 | £0.16 |
| PCB | PCB for project | 1 | |
| TOTAL | £6.54 | ||
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