ES21x 10-Step Sequencer
ELBY Designs - Laurie Biddulph
9 Follan Close, Kariong, NSW 2250, Australia
2 of 2
Construction of the ES21x requires the assembly of 4 separate boards:-
Column 1 - ES21 Support PCB (
) (
Column 2 - ES21 Support PCB (
) (
Column 3 - ES21 Support PCB (
) (
Main - ES21x PCB (
) (
Constructors should refer to the PCB Overlays for any specific
comments regarding the board assemblies, the
for the current value of all components and
Construction Notes
for general PCB assembly guidelines.
1.Start by preparing the 10x LEDs as per the instructions in
the General Construction Notes
2.Fit all components to the boards following normal
assembly guidelines excluding R105, R106, R107, the
10x LEDs and MANUAL pushbutton switch
3.Fit the Column 2 assembly to the front panel.
4.Mount 5x LEDs ensuring the correct orientation of the
LED wires in to the board and solder in to place
5.Remove the assembly and repeat for the Column 3
assembly
6.Mount the pushbutton switch on to the Column 1
assembly but do not solder
7.Offer the assembly up to the front panel and secure using
the supplied nuts and then solder in to place
8.Mount the other assemblies on to the front panel and secure in to place
9.Fit the back-board assembly ensuring the correct alignment of the IDC Receptacles in to
their respective sockets
Calibration
The ES21 does not require any set-up or calibration
Addendum
Due to a PCB error we are currently supplying the LM339 comparator IC (U102) on a small piggy-
back board which you simply mount on to the respective IC socket. You should also fit a wire link
between U102_14 and C303_1
On the V0.1 revision of the
, the pad for J6_4 has been cut and should not be
soldered to the connector.
