Elenco FM Radio User Manual

WARNING: Always check your wiring before

urning o n a ci rcuit . Never leave a circuit

t
unatte nded wh ile the batter ies are instal led.

ever connect additional batteries or any other

N
power sources to your circuits.

FM Radio

Model SCP-12

ARNING: SHOCK HAZARD -

W

Never connect Snap Circuits
to the electrical outlets in your

ome in any way!

h

®

Placement

evel Numbers

L

Project #1 FM Radio

Snap Circuits®uses electronic blocks that snap onto a clear plastic base grid to build different circuits.
These blocks have different colors and numbers on them so that you can easily identify them. Build
the circuit shown by placing all the parts with a black 1 next to them on the clear plastic base grid first.
Then, assemble parts marked with a 2, then parts marked with a 3, and finally, parts marked with a 4.
Note that there is a 3-snap wire between the FM module (FM) and the speaker (SP), partially hidden.
Install three (3) “AA” batteries (not included) into the battery holder (B3).

Turn on the slide switch (S1) and press the R button on the FM module (FM). Now press the T button
and the FM module scans for a radio station. When a station is found, it locks on to it and you hear it
on the speaker (SP). Adjust the volume using the adjustable resistor (RV). The resistor controls the
amount of signal into the power amplifier (U4). Press the T button again for the next radio station. The
module will scan up to 108MHz, the end of the FM band, and stop. You must then press the R button
to reset at 88MHz again.

Project #2

Modify the circuit shown by removing the 2-snap wire and the single
snap that are connected to the FM module (FM), note that the single
snap is beneath the adjustable resistor (RV).

Position the adjustable resistor (RV) at the top and turn on the slide
switch. You should be able to touch point A with your finger and hear
static. Listen closely to the speaker (SP) or wet your finger if you don’t
hear any sound. High frequency clicks, static or even an AM radio
station should be coming from speaker indicating that the amplifier is
powered on and ready to amplify signals.

The power amplifier may oscillate on its own. Do not worry, this is
normal with high-gain, high-powered amplifiers.

Project #3

Use the circuit from Project #2. When you place one finger on point A
and a finger from your other hand on the point B, what happens? If the
amplifier starts to oscillate, it is due to the fact that you just provided a
feedback path to make the amplifier into an oscillator. You may even be
able to change the pitch of the oscillation by pressing harder on the
snaps.

This is the principle used to make an electronic kazoo. If you practice
and learn the amount of pressure required to make each note, you may
even be able to play a few songs.

Project #4

Use the circuit from Project #3.

Turn on the slide switch (S1) and place one finger on point C and a
finger from your other hand on point B. The trombone should start
playing due to the fact that you just provided a feedback path to make
the amplifier into an oscillator. To change the pitch of the sound, simply
slide the adjustable resistor (RV) control back and forth. By moving the
slider, you will be able to play a song much like a trombone player
makes music. The RV control is the same as a trombone slider bar. The
circuit may be silent at some positions of the resistor control.

Power Amplifier

Electronic Kazoo

Trombone

If you have any problems, contact Elenco

®

Copyright © 2014 Elenco®Electronics, Inc. All Rights Reserved. ● 150 Carpenter Ave. ● Wheeling, IL 60090

[phone] Fax: [phone] ● e-mail: [e-mail] ● Website: www.elenco.com or www.snapcircuits.net

753161

OTHER SNAP CIRCUITS®PRODUCTS! PARTS LIST

Contact Elenco®to find out where you can purchase these products.

Snap Circuits®Jr. Model SC-100

Build over 100 projects, contains over 30 parts.

Snap Circuits®Green Model SCG-125

Build over 125 projects, contains over 40 parts.

Flying Saucer Plus

Model SCP-09

Basic Electricity

Model SCP-10

Build over 175 projects, contains over 55 parts.

Snap Circuits®Sound Model SCS-185

Build over 185 projects, contains over 40 parts.

LED Fun

Model SCP-11

Snap Circuits®Light Model SCL-175

Motion Detector

Model SCP-13

Strobe Light & Sound

Model SCP-14

Qty. ID Name Part #

r 1 Base grid 6SCBGMF
r 4 1 1-snap wire 6SC01
r 5 2 2-snap wire 6SC02
r 2 3 3-snap wire 6SC03
r 1 B3 Battery holder 6SCB3
r 1 FM FM module 6SCFM
r 1 RV

Adjustable resistor

6SCRV

r 1 S1 Slide switch 6SCS1
r 1 SP Speaker 6SCSP
r 1 U4 Power amp IC 6SCU4

Important: If any parts are missing or
damaged, DO NOT RETURN TO
RETAILER. Call toll-free [phone] or
e-mail us at: [e-mail].
Customer Service ● 150 Carpenter Ave. ●
Wheeling, IL 60090 U.S.A.

You may order additional / replacement
parts at our website: www.snapcircuits.net

BATTERIES:

● Use only 1.5V AA type, alkaline
batteries (not included).

● Insert batteries with correct polarity.

● Non-rechargeable batteries should not

be recharged. Rechargeable batteries
should only be charged under adult
supervision, and should not be
recharged while in the product.

● Do not mix alkaline, standard (carbon­zinc), or rechargeable (nickel­cadmium) batteries.

● Do not mix old and new batteries.

Remove batteries when they are used up.

●

● Do not short circuit the battery

terminals.

● Never throw batteries in a fire or
attempt to open its outer casing.

● Batteries are harmful if swallowed, so

keep away from small children.