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x0x:headphonetesting

Testing the Headphone and Mixer

Generally, this section is best tested when all the jumpers are attached.

Headphone Testing

Here is a list of voltages that should be seen on the LA4140. The best way to test it is to set the x0xb0x to random mode and the volume full up. Make sure you do not have headphones connected.

Pin DC Offset AC Volts
1 1v 40mv
2 3v 400mv
3 3v 400mv
4 3v 2v
5 0v 0v
6 3v 2v
7 6v 0v
8 6v 2v
9 3v 0v

These values are approximate, variations of 10% should be expected.

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
/home/ladyada/public_html/wiki/data/pages/x0x/headphonetesting.txt · Last modified: 2016/01/28 18:05 (external edit)

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