Radio Shack FX2 User Manual download pdf (Page 11)

Building Hints

Due to the simplicity of this project, it should be no problem to

put together. You can use a perfboard or one of the prototype

circuit boards sold at Radio Shack stores, or even etch and drill

your own printed circuit board if you're truly hardcore.

The interface and its power supply should be mounted into an

appropriate case; I recommend using a single-height rack

mount chassis. While this is more expensive than other alterna

tives, it's sturdy enough for professional use, and it has plenty

of leftover room for other projects. A suggested layout for the

front and back panels is shown in Fig. 2.

A good source of inexpensive rack chassis is PAIA Electronics

(3200 Teakwood Lane, Edmond, OK 73013). They sell the

RCEl, a single-height chassis, for $19.95 and $2.00 P&H. In

addition, they also sell black rack panels and both 12 and 15

Volt bipolar power supply kits. To get a catalog, you can call

'em at (405) 340-6300.

Testi ng a nd Troubl eshoo t ing

Once everything has been wired up, take a few minutes to in

spect your handiwork. Make sure that there are no obvious

problems like cold solder joints, or missing insulation on wires,

and that polarized components (like the IC, CI, and 02) are

oriented correctly. Everything look OK?

Before we hook up the interface to your EPS, turn on the power

and make sure that it doesn't smoke or catch ﬁre. If you have

access to a voltmeter, check the power supplies to make sure

that they are operating.

Finally, hook up a control voltage source to Jl, a footpedal to

J2, and coimect J3 to the EPS CV jack with a stereo guitar cord.

Assign the EPS pedal to volume, and verify that the EPS

responds to both control voltage and footpedal operation. Once

that you know that everything is working, you can move on to

experimenting with different control voltages with the EPS.

Help Us Decide...

We'd like to invite your suggestions for other control voltage

projects in this series. Two ideas that I had in mind were a

breath controller interface, and an envelope follower. If you

have any ideas for other projects — or have a specific feature

that you'd like to see implemented in a project — please drop

me a line:

C h a r l e s R . F i s c h e r

P. O. Box 5372, Hercules, CA 94547

Please remember to include a SASE if you want me to reply;

thanks in advance for writing. Finally, I'd like to thank my

friend (and Electronic Musician Managing Editor) Steve Op-

penheimer, for the use of his EPS.

P a r t s L i s t F o r T h e E P S C V I n t e r f a c e

ICl: 741, TL 071, or TL 081 generic op amp

Rl, 2: 100k (100,000) Ohms @ 1/4 Watt

CI, 2: 1 uF (1 microFarad) @ 25V (or greater), electrolytic or

tantalum capacitors

Jl, 2, 3: Stereo 1/4" phone jacks

SI: single-pole, double-throw (SPDT) toggle or slide switch

Bio.: Charles R. Fischer is a well-known author, musician, syn

thesizer programmer, and electronics designer. He's hoping to

ﬁnd a day job as an electronic technician pretty soon as he's

getting married next April, and he will have to be paying a few

expenses.

Front Panel

°;

i °

Pedal

' o

(Note: Since the views are facing opposite directions, the switch

R e ar P a ne l a n d t he c onn ect ors a te a ctu all y o n t he s a me e nd o f t h e r ac k .)

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Radio Shack FX2 User Manual Page 11

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