apple macintosh midi interface schematic basic version
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MIDI Controller Footpedal
Here is a simple project that sends continuous or switch controller MIDI messages that correspond to the position of a potentiometer. Given a few parts and a cannibalized volume or wah-wah pedal, you can build this MIDI controller pedal and...
Audio Line Driver
The preamplifier described is engineered with a low output impedance, specifically designed to handle long cable runs. This feature allows for listening to a remote music source without the need for expensive screened cables. The preamplifier boasts a very low...
SB Midi Cable
The Sound Blaster MIDI port utilizes two pins from a 15-pin joystick port, which typically serve as redundant +5 volt and ground lines. In the context of the Sound Blaster, these pins are designated as MIDI TXD (Transmit eXternal Data)...
Original Macintosh 512K Logic Board Schematic
The following is one of the rare and significant documents at DigiBarn, the only known copy of the complete schematic specification for the 512K Macintosh Logic Board. Co-authored by Daniel Kottke, this design served as the foundation for the 64K...
Simple Hybrid Audio Amplifier
The ongoing debate regarding the superiority of valves versus transistors is not the focus here. However, for those undecided, this simple amplifier serves as an excellent test. It employs a valve as a pre-amplifier and a MOSFET in the output...
Power Amplifier Mini 2W+2W by TBA820M
The circuit is designed to amplify telephone signals using a 2W+2W amplifier with an 8-ohm loudspeaker. It provides adequate sound output while maintaining good audio quality. The primary component of this telephone amplifier circuit is the IC LF351, which enhances...
Switch and Controller MIDI Pedal
The sustain pedal, also known as the damper pedal, sends a controller value of CC64 when operated. Pressing the pedal results in an output value of 127, while releasing it results in an output value of 0. Tone generators that...
Audio Millivoltmeter
An AC millivoltmeter - calibrated in dB - with a range of 30V down to 3mV full scale (80dB range) would be extremely useful. Attach a microphone (electret mic capsules are quite good), and you have a relative sound level...
MID Bass Pedal
The MIDI Bass Pedal utilizes a MIDI keyboard encoder (MKE) that can encode a variable number of momentary action, push-to-make, single pole single throw (SPST) switches, ranging from 1 to 128, to generate corresponding MIDI note-on/note-off data commands. The encoded...