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BUILD NOTES, CONT.

voltage

BBDs typically require pin 4 (V

) to be supplied with a voltage that is 14/15ths of the supply voltage

) for best performance. This V

voltage is intended to be supplied by the MN300X series'

companion clock chip, the MN3101.

The Small Clone does not use the MN3101, but instead uses a CD4047 to generate the clock signal.

Electro-Harmonix did not implement an external 14/15 voltage divider, instead connecting the V

to the V

supply voltage, and the circuit seems to perform just fine without it.

However, we've heard anecdotally that the MN3207 is more sensitive to the 14/15 voltage than the

MN3007, so it may be the case that the MN3207 requires this 14/15 network where the MN3007 does

not. It may also be the case that the performance of the MN3007 in the stock circuit could be improved

with this network, so you could try using it even with the MN3007—though whether it will affect the

character of the effect, we don't know.

Either way, if you want to use the 14/15 V

network, use 1k for R16, 14k for R17, and a 4.7uF or 10uF

tantalum capacitor for C9.

To build the stock circuit, omit C9 and R17 (in other words, leave them empty) and jumper R16.

Mix knob

The original Small Clone had a fixed proportion of dry and wet signals mixed in the last op-amp stage.

We've added a Mix knob that allows the wet signal to be dialed back.

The vintage Small Clone used a 27k resistor for R24, while the 2002 reissue reduced this to 20k,

resulting in a more prominent wet mix. Due to the addition of the Mix knob, it's recommended to always

use the modern value of 20k since the mix knob directly adds to this fixed resistance value. Therefore,

to get the "vintage" value of 27k, just turn the mix knob down about 10-15%. With the mix knob at full

rotation, it's equivalent to the "modern" value of 20k.

Depth knob

The original Small Clone only had a 2-position depth switch to change the intensity of the chorus sound.

We've converted this to a potentiometer that allows fine-tuning the depth across the whole range and

beyond, instead of being stuck with two presets.

Vintage/Modern slide switch

The original Small Clone used a 100pF timing capacitor for the clock, while the reissue uses 150pF.

This changes the delay range somewhat, but even adjusting the rate to compensate, the tone is a little

different. We've included the vintage 100pf capacitor as the default, as well as a 47pF capacitor that

can be switched in parallel using an on-board slide switch. If you don't care to have the modern value

available, you can omit C18 and the slide switch (no jumpers needed) and just use C17.

Note that the modern Small Clones also change R8 to 9k1 to add back some of the brightness that is

lost by the capacitor change. This is sort of a hack on EHX's part since it puts the pre/de-emphasis filters

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