Aion Electronics OCEANID Manual - Halaman 6

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BUILD NOTES

Transistor selection

The original OC-1 uses BC549C transistors. The pinout on the Oceanid PCB is for the U.S. "E-B-C"

convention as used by the 2N3904 and 2N5088. The 2N5088 will operate identically to the BC549C,

but if you do want to use the original type, just note that they will not follow the PCB outline. Typically

they would need to be rotated 180 degrees, but check the datasheet for your brand as they do vary.

Bypassing the true bypass / buffer switch

The E-Switch EG4208 slide switch used for the true bypass/buffer selector is available from Mouser

Electronics but may not be accessible to everyone. If you are unable to obtain it, you can hard-wire the

switch to either true bypass mode or buffered mode by soldering jumpers to the switch pads.

Setting the bias trimmer

The OC-1 has a trimmer to set the bias of the LED, affecting the LED's brightness in relation to the signal

level. This essentially sets the range of the Compression control.

It's not known what parameters are used to calibrate this trimmer. In the original unit that was traced,

the trimmer was set at just about 25% rotation (measured 5.68k between pins 1 and 2, with the total

trimmer value of 20.78k), so that would be a good place to start.

Beyond that, don't worry about it too much! You can tune it by ear, and as long as you like the range of

the Compression control and how the pedal responds to your playing, that's what matters.

Voltage reference

The LM4040 used for Z1 is not something commonly seen in pedals. It functions as a a high-precision

zener diode that sets the voltage reference at exactly 5.00V regardless of the input signal.

However, since in this circuit the voltage is trimmed down further from that

point to set the bias, the high-precision voltage reference is not really necessary.

Because of this, if you can't find the LM4040, you can instead use a 1N4733A

5.1V zener diode, wired as shown in the diagram to the right.

The diode will have to be installed standing up in order to fit the pads. The

cathode (striped side) of the zener should go to the middle pad while the anode

goes to the left-most pad, grounded on the PCB. The right-most pad is not used.

OCEANID OPTICAL COMPRESSOR