4ms Autonomous Bassline Generator Builder's Manual - Page 3

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Step 4: Capacitors, Transistors, Photocell

Step 5: Controls

Insert and solder the capacitors, transistor, and photocell::

1uF x 1

•

10uF x 1

•

100uF x 1

•

0.1uF x 1

•

0.01uF x 2 (for "-C-", or use the socket. See note)

•

2N089 transistor

•

7805 voltage regulator

•

Photocell

•

Note: For the 1uF, 10uF and 100uF caps, the long lead of the cap is

the positive, and it goes in the square hole.

Note: the spots marked "-C-" are tweakable capacitors. Changing

their value will change the analogue filter. The easiest thing to do is

to install a 0.01uF capacitor for each. A more advanced approach is

to install two socket holes now and put in 0.01uF caps later. Then

you can swap the caps out for different filter sounds.

Insert and solder the controls:

Buttons x 3

•

Rotary x 1

•

Trim-pot (100k) x 1

•

Red LED in the center of board (see note) x 1

•

Red LED x 1

•

Blue LED x 1

•

Note: The long lead of the LED is the positive and it goes in the

square hole (red and blue LEDs only).

For the red LED in the center of the board: it should stick up enough

so that you can bend it over to shine it on the photocell. In the photo,

I put heat-shrink tubing on the leads. If you don't have that, you can

use electrical tape or paper/masking tape.... or nothing if you're

careful!