If you want to connect your guitar or other equipment to your Iphone
for using AmpliTube or similar apps and don't want to buy an overpriced
adapter why not build one yourself?
- First get yourself a 4-pin headphone connector (maybe you have an old
mobile with some headphones
with microphone included, I used one of my N95).
- Unfortunately Apple uses the 2nd ring for "Ground" and supplies a
2,7V DC voltage on pin 4,
which has to be pulled down to switch on the input for external
equipment (thats what R1 is
used for. Not applying this resistor results in sudden stops of input
signal or crashes the app!).
- C1 cuts off the DC to our guitar (we don't want DC, lots of noise and
strange behaviour of the loudness control - a guitar is made
- P1 is used for adjusting the input level of the external
equipment. Adjust to desired level (for AmpliTube turn to lower level
until effects like Wahwah and Envelope Filter work fine)
- Have fun :-)