Schematic Overview:Headphones and Mixer
IoBoard Audio (Mix out and Headphones)
This section is relatively simple. It taxes the incoming signal on the Mix In jack, and combines it with the x0xb0x signal. Then it is sent to Mix Out Jack. It is also sent to the headphone section, which is the LA4140, and support circutry.
The input from the VoltageControlledAmplifier goes through a Capacitor and Mixing Resistor, so that it can be mixed in with the audio from Mix In. Note that the Mix In Audio has twice the resistance as the x0xb0x audio.
(blah blah transistors, blah blah. Need more info. WorkOnMe)
The Headphone Amplifier uses a LM4140. It's support circuitry is practically right out of the datasheet, with a few exceptions. (WorkOnMe)
|Schematic||Power Supply||Voltage Controlled Oscillator||Voltage Controlled Filter||Envelope Generator||Voltage Controlled Amplifier||Headphone And Mixer||Digital Sequencer||Midi, USB and Sync|
|Fabrication||Building the Ps||Building the Vco||Building the Vcf||Building the Envelope||Building the Vca||Building the Headphone And Mixer||Building the Sequencer||Building the Midi and Sync||Finishing It Off|
|Testing||Testing the Ps||Testing the Vco||Testing the Vcf||Testing the Envelope||Testing the Vca||Testing the Headphone And Mixer||Testing the Sequencer||Testing the Midi and Sync|
|Mods||Ps Mods||Vco Mods||Vcf Mods||Envelope Mods||Vca Mods||Headphone And Mixer Mods||Sequencer Mods||Midi And Sync Mods||Finishing Mods|