Archive for the ‘Circuit Ideas’ Category

Null Modem Cable

Thursday, June 25th, 2015

Every now and again I need a null modem cable and have to go searching for the connections. Here they are:

Null modem with full handshaking

MIDI Interface

Thursday, June 25th, 2015

MIDI is commonly used to connect musical instruments together and to a computer / sequencer.  A standard 180° 5pin DIN connector is used. with the signal on pins 4 and 5.  Below a circuit to interface this to a microprocessor.