ColoredThro v1.0
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5
Power section
The effect has been designed to be able to operate on 9V or 18V using an internal charge pump. SW3
enables you to switch dynamically between the 9V and 18V setting. If you do not want to use the
switch then do not forget to solder a jumper between the middle pad and the desired voltage pad.
NEVER let the outer 2 lugs of SW3 tough each other and also never connect all 3 pins of SW3
together. If the IC gets hot then there is a short in the power section and you must disconnect the
effect immediately from the adapter and find the fault.
You can choose between 3 options for the power section:
1.
No charge pump
:
Do NOT install: C16, C17, D2, D3, IC1, J1 and SW3
Extra jumpers: SW3 on 9V pad and middle pad
The effect can now be used with a standard 9V adapter or an 18V adapter
2.
Charge pump using a ICL7660S
:
Place all components as stated on the PCB and
connect a jumper wire between leg 1 and 8
(marked J1)of IC1. Do not forget to place the jumper
before placing the DIP-8 socket for IC1.
NB. Only use the 7660S and not any other
version without the S.
The effect can now only be used with a 9V adapter but you can switch it internally to 9V or
18V using SW3.
3.
Charge pump using a LT1054:
You can place all components as stated on the PCB just do NOT connect J1 (pin 1 and 8 of
IC1)!!
The effect can now only be used with a 9V adapter but you can switch it internally to 9V or
18V using SW3.
Which IC should I choose? ICL7660S or LT1054? In this application it does not really matter. The
LT1054 can give more current @18V (100mA) than the ICL7660S (45mA @18V) but the ColoredThro
does not draw that much current in any configuration. On the other hand the ICL7660S is much
cheaper than the LT1054, so that could be a good reason to use it. But then again, maybe you have a
stash of LT1054 you want to use.
