Franzis UKW 65287 User manual

FM Radio Construction Set
UKW-Radio Bausatz
FM Radio Construction Set
UKW-Radio Bausatz
FM Radio Construction Set
UKW-Radio Bausatz
FM Radio Construction Set
UKW-Radio Bausatz
Bauen
ohne Löten!
Build without
soldering!
Bauen
ohne Löten!
Build without
soldering!
ISBN 978-3-645-65287-2
Besuchen Sie unsere Website: www.elo-web.de
Für Kinder unter 14 Jahren nicht geeignet!
This is not a toy! Not suitable for children under 14 years.
© 2017 Franzis Verlag GmbH, Richard-Reitzner-Allee 2, D-85540 Haar, Germany · Innovationen, Irrtümer und Druckfehler vorbehalten. 2017/01
Build your own
working FM radio
This great kit contains all the components you
need to build your very own piece of retro cool –
a modern style working FM radio!
Includes full instructions in the shape of a Manual.
The perfect gift for‚build your own‘ fans of all
things retro!
Requires one 9-V-batterie – not included.
Der Radio-Bausatz mit Steckpla-
tine, bestückter SMD-Platine und
allen Bauteilen: einfach zusam-
menzubauen, ganz ohne Löten.
Radio hören kann jeder – Sie können
jetzt etwas viel Spannenderes, näm-
lich Ihr eigenes Radio konstruieren.
Mit diesem Paket geht es ganz leicht
und macht dabei jede Menge Spaß.
Alle erforderlichen Komponenten
sind enthalten: Gehäuse, Lautspre-
cher, Steckplatine, SMD-bestückte
Empfangsplatine mit integriertem
UKW-Empfänger TDA7088, Lautspre-
cherverstärker, Potis und vieles mehr.
Hochwertige Bauteile sorgen für
klaren UKW-Empfang und gute Laut-
stärke. Mehrere Schaltungsvarianten
werden dazu vorgestellt und erklärt.
Abmessungen des
zusammengebauten Radios:
190 x 135 x 26 mm (B x H x T)
Zusätzlich erforderlich:
eine 9-V-Blockbatterie, ausreichend
für bis zu 50 Stunden Musikgenuss.
65287-2 Banderole_2017.qxp 08.12.16 14:33 Seite 1

Imprint
© 2020 Franzis Verlag GmbH, Richard-Reitzner-Allee 2, 85540 Haar
www.franzis.de
Author: Burkhard Kainka
ISBN 978-3-645-65287-2
All circuits and programs depicted in this book are developed and tested with utmost care. Nonetheless, it is not possible to rule out all errors
in the book or in the soware. Publisher and author are only liable in case of intent or gross negligence according to legal regulaon. Beyond
that, publisher and author are only liable according to the law on product liability concerning hazards to life, body, and health and the culpable
violaon of essenal contractual obligaons. The damage claim for the violaon of essenal contractual obligaons is limited to the con-
tract-specic, predictable damage, unless in cases of mandatory liability according to the law on product liability.
Waste electrical products should not be disposed of with household waste. Please recycle where facilies exist. Check with your local
authority or retailer for recycling advice.
SIMPLIFIED EU DECLARATION OF CONFORMITY
Hereby, FRANZIS Verlag GmbH declares that the radio equipment type FM Radio Construcon Set, type number FRANZIS_Radio_001,
is in compliance with Direcve 2014/53/EU. The full text of the EU declaraon of conformity is available at the following internet address:
www.franzis.de/conformity
Dear customers!
This product was developed in compliance with the applicable European direcves and therefore carries the CE mark. Its authorized use is
described in the instrucons enclosed with it. In the event of non-conforming use or modicaon of the product, you will be solely responsible
for complying with the applicable regulaons. You should therefore take care to assemble the circuits as described in the instrucons. The
product may only be passed on along with the instrucon and this note.
All rights reserved, including those of reprinng, reproducon and storage in electronical media. No part may be reproduced and distributed on
paper, on storage media, or in the Internet, especially as PDF, without the publisher‘s prior wrien permission. Any aempt may be prosecut-
ed. Hardware and soware product names, company names, and company logos menoned in this book are generally registered trademarks
and have to be considered as such. For product names, the publisher uses mainly the spelling of the manufacturer.

Introducon
By assembling this radio, you will gain insights into electronics and experience a sense of achievement even early on. Explore
the funconality of the individual components and gradually build a complex circuit. Finally, use the completed FM radio to
listen to your local FM staon in great sound quality!
The FM radio is easy to
assemble and yet oers
many possibilies. There
are numerous versions
and opons. Feel free to
experiment with
dierent circuits and
antennae to receive
staons near you or far
away.
Enjoy your radio kit!
3

Contents
Introducon .................................................................................. 3
The Components ........................................................................... 5
Step 1: Mounng the Amplier .................................................... 12
Step 2: Sound Generator .............................................................. 16
Step 3: Improved Amplier .......................................................... 19
Step 4: Simple Radio .................................................................... 22
Step 5: Tuning .............................................................................. 25
Step 6: Mounng in the Housing .................................................. 28
Troubleshoong .......................................................................... 34

The Components
The various circuits are built on a bread-
board. The centre part contains 46 contact
strips with ve contacts each. The two long
strips with 20 contacts along the edges
are typically used to provide the operang
voltage.
Internal
connecon of
the contacts
5

All components are inserted in the breadboard and thus connected to each other. The individual steps are illustrated with
assembly drawings, photos or circuit diagrams. The symbols in the circuit diagrams are as follows:
FM board
Capacitor E-capacitor Resistor Potenometer Switch Amplier
On
Baery Voltage regulator Loudspeaker
6

FM board
Voltage regulator
The FM board is the essenal component of this radio. It
contains an integrated circuit and many ny pre-soldered
capacitors and resistors. You can easily recognise two printed
coils and the upright variable capacitance diode. There are six
pins to connect the board with the breadboard and thus the
other components. It is important to supply the radio board
with an operang voltage of only 3 V. It must never be con-
nected directly to a 9 V baery. Instead, a voltage regulator is
required.
The HT7530 voltage regulator provides a stable voltage of 3 V.
Its three legs are not interchangeable. The middle leg is the
input. It connects to the posive terminal of the 9 V baery.
The output, i.e. the right pin, then provides a stable voltage of
+3 V. The third pin connects to a shared negave terminal.
7

LoudspeakerLM386 amplier
The LM386 loudspeaker amplier is an integrated circuit (IC)
in a housing with eight pins, numbered from pin 1 at the bot-
tom le corner to pin 8 at the top le corner. Pin 4 (boom
right) is the negave terminal of the power supply. The ampli-
er operates at 9 V and provides 0.5 W to the loudspeaker.
The loudspeaker exhibits a resistance of 8 Ohm and can
tolerate up to 0.5 W. The volume depends mainly on how the
loudspeaker is mounted. A pleasant sound is only achieved by
installing the loudspeaker in the housing.
8

100 µF e-cap
100 nF disc capacitor
The loudspeaker must not be
connected directly to the am-
plier but requires a capacitor.
Any capacitor consists of two
metal sheets insulated against
each other. The electrolyc
capacitor (e-cap) used here
contains aluminium sheets in a
conducve uid (electrolyte).
You have to pay aenon to
the mounng direcon as
the e-cap will be destroyed
when the polarity is reversed.
The negave terminal is the
shorter leg; it is addionally marked by a
white bar. The kit contains two idencal
e-caps with a capacitance of 100 microfa-
rad (100 µF).
There is another capacitor with only a
1000th of the capacitance of the e-cap,
i.e. 100 nanofarad (100 nF). The im-
printed number 104 means 100,000 pF
(picofarad). This component is a ceramic
disc capacitor and can be mounted in
any direcon.
9

10 kΩ and 1 kΩ resistors Tuning potenometer
The resistors in the kit are of the carbon lm type and can
be mounted in any direcon. The smallest one has a resis-
tance of 100 ohm (100 Ω), the biggest one has 220 kiloohm
(220 kΩ). The resistance values are shown by three coloured
rings. The fourth, gold ring represents a tolerance of 5%. The
kit contains four resistors in total.
100 Ω: brown, black, brown
1 kΩ: brown, black, red
10 kΩ: brown, black, orange
220 kΩ: red, red, yellow
Basically, a potenometer is a resistor; however, it contains a
third contact, which is shied by turning the axis. The poten-
ometer will be mounted in the radio housing with a washer
and a nut, and a rotary knob will be screwed to the axis. This
three-pin potenometer is intended for tuning the radio.
10