User manual

Version 3.0

[February, March and August 2004, SNs 162, 163 and 164.] This is sonically identical to

version 2.1D. There are two changes:

1. The printed circuit board is a fresh design, integrating the changes listed above

which were done as modifications to the 2.1 boards.

2. I pack the six small TB-303 knobs (Tuning to Accent) with a small insert, which

together with the “Blu-Tack” which helps stop the knob from coming adrift,

causes the knobs to be about 1.5mm higher. This makes them easier to turn.

Version 3.0B

[August 2005, SN 190.] This is sonically identical to version 2.1D. One Devil Fish was

made with this version number, but others may be upgraded to it in the future. These are

3.0 boards, but with the 4.0A and 4.0B modifications to cope with all types of TL072 and

to make the Normal and Accent Decay LEDs brighter for shorter times.

Version 3.0C

[August 2005, SN 187 and 188.] These use 3.0 boards, but with the 4.0A, 4.0B and 4.0C

upgrades as described below. So this is like 3.0B but with longer C-cell battery life.

Version 4.0

[December 2004. SN 165, 166 and 167.] This is functionally identical to Version 3.0 and

therefore 2.1D. The printed circuit boards have provision for the MIDI In system.

Version 4.0A

[January 2004. SN 168, 169 and 170.] Apart from a minor matter of LED brightnesses,

this is functionally identical to Version 4.0 and therefore 2.1D. A diode has been added

to cope with TL072 op-amps which can’t output below their specified limit of 1.5 volts

above their negative supply. I was expecting them to go below this when driving the

Normal and Accent Decay LEDs and this caused a slight continual glow on one of these

LEDs at all times. Serial numbers 168 and after (except perhaps where I use a 3.0 board

for customers who don’t need MIDI In) are version 4.0A. The problem only affected the

LED – not the sound – and may be present on the three 4.0 machines.

Version 4.0B

[February to July 2005. SN 171 to 186.] Apart from a minor matter of LED

brightnesses, this is functionally identical to Version 4.0A and therefore 2.1D. I changed

the design slightly so that the Normal and Accent Decay LEDs are brighter when the

times for these Decays are very short.

Version 4.0C

[August to December 2005. SN 189, 191, 193, 194 and 195.] This is sonically identical

to version 2.1D. Please see the discussion above on operation from C-cell batteries.

Beginning in August 2005, I added three changes which have the effect of increasing the

battery life when running from C-cells. These do not reduce the current consumption, but