Ramsey Electronics BULLSHOOTER ENDLESS LOOP BS2C Assembly And Instruction Manual
BS2 • 1
THE BULLSHOOTER
ENDLESS LOOP
VOICE RECORDER
Ramsey Electronics Model No. BS2C
Announcing an event is now easier than ever! Just say it once
and hear it over and over. Easy transmitter hookup for
broadcasting.
•
Operates on 5 to 12 Volts DC, 250mA at maximum volume.
•
Records both line levels and microphone levels, front panel s witchable.
•
Internal microphone included, has external microphone jack for
higher fidelity.
•
Adjustable line level output.
•
8 separate message locations totaling up to 8 minutes, or combine
into one 8-minute message.
•
Up to a 8kHz sample rate for good audio reproduction to 3.4kHz.
•
Digital speaker volume control and 8 ohm speaker output.
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Single-Play and continuous repeat mode with programmable
delays : 0sec, 0.5sec, 5sec, 30sec, 1min, 10min, 30min, 60min.
•
Easy to record a message and allows monitoring of recording
session for easy level adjustment.
•
Lock mode which prevents user tampering once set up. (multiple
key combination to lock/unlock)
•
Non-volatile message storage capable of retaining recording for
over 100 years without power.
BS2 • 2
RAMSEY TRANSMITTER KITS
• FM100B Professional FM Stereo Transmitter
• FM25B Synthesized Stereo Transmitter
• AM1 , AM25 AM Transmitters
• TV6 Television Transmitter
RAMSEY RECEIVER KITS
• FR1 FM Broadcast Receiver
• AR1 Aircraft Band Receiver
• SR2 Shortwave Receiver
• AA7 Active Antenna
• SC1 Shortwave Converter
RAMSEY HOBBY KITS
• SG7 Personal Speed Radar
• SS70A Speech Scrambler
• SP1 Speakerphone
• WCT20 Wizard Cable Tracer
• PH10 Peak hold Meter
• LC1 Inductance-Capacitance Meter
RAMSEY AMATEUR RADIO KITS
• DDF1 Doppler Direction Finder Kit
• HR Series HF All Mode Receivers
• QRP Series HF CW Transmitters
• CW700 Micro Memory CW Keyer
• CPO3 Code Practice Oscillator
• QRP Power Amplifiers
RAMSEY MINI-KITS
Many other kits are available for hobby, school, Scouts and just plain FUN. New
kits are always under development. Write or call for our free Ramsey catalog.
ENDLESS LOOP VOICE RECORDER INSTRUCTION MANUAL
Ramsey Electronics publication No. MBS2 Rev 1.3
First printing: May 2004
COPYRIGHT 2004 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York
14564. All rights reserved. No portion of this publication may be copied or duplicated without the
written permission of Ramsey Electronics, Inc. Printed in the United States of America.
BS2 • 3
THE BULLSHOOTER
ENDLESS LOOP
VOICE RECORDER
Ramsey Publication No. MBS2
Price $5.00
TABLE OF CONTENTS
Introduction ............................................4
Circuit Description.................................. 5
BS2C Parts List......................................7
Parts Layout Diagram............................9
Assembly Procedure............................ 10
Schematic Diagram.............................. 14
Initial Testing and Operation................ 20
Using the BS2C ................................... 20
Case Up Instructions............................ 25
Troubleshooting...................................26
Warranty............................................... 27
KIT ASSEMBLY
AND INSTRUCTION MANUAL FOR
RAMSEY ELECTRONICS, INC.
590 Fishers Station Drive
Victor, New York 14564
Phone (585) 924-4560
Fax (585) 924-4555
www.ramseykits.com
BS2 • 4
INTRODUCTION
Each of us at one time or another has probably heard an endless loop player
repeating a list of movies playing at the local theatre, or advertising a house for
sale through your car radio. Sure could be handy around the house
occasionally, or maybe down at the local flea market. Could you modify a
cassette or CD player to duplicate this function? Good luck! Where could you
even find that sort of machine anyway, and how much would it cost? Enter the
BS2C Bullshooter.
As a stand alone unit, the BS2C is perfect for the task of, say, announcing
repetitive instructions at an event: “All vendors please report to the registration
desk located at the …“. Connected to one of our personal broadcasters like the
FM25B, the BS2C is ideal for advertising neighborhood garage sales or school
or church functions. How about a look at the BS2C?
You will notice right away that the Bullshooter isn’t your average tape player. In
fact, utilizing one of the latest voice recording chips on the market, the BS2C
performs its job without need of a tape. There are no motors, drive belts, or
gears to wear out. With the exception of the front panel controls, there are no
moving parts at all! In addition, the endless loop playback feature makes the
Bullshooter a truly unique device.
A quick push of the RECORD and PLAY buttons sets up the BS2C to record up
to a full eight minutes of audio, depending on how you have set up the sample
rate, and what message location you start at (See “Using the BS2C”). Use the
on-board microphone to record a quick message or press both UP DOWN keys
to enable use of the line level input for recording from other sources; cassette,
CD, radio, etc. A “Record” LED serves as the record mode indicator and
extinguishes when the maximum memory capacity has been reached or you
press STOP.
The PLAY button selects playback mode which is set up for single play
operation by default. The message recorded will continue playback indefinitely,
looping over and over for as long as the unit remains in play mode. Through
programming of the internal microcontroller the message will always start from
the beginning, thus negating the need for rewinding. The “Play” LED simply
serves as an indicator for playback mode.
The Bullshooter features two sets of audio outputs to best suit the application
at hand. The speaker output (volume controlled by the front panel UP/DOWN
buttons) has sufficient power to drive most speakers well into normal listening
volumes. Although being a monaural device, twin line level outputs are
provided for connection to equipment such as mixers, amplifiers, or transmitters
which would normally require left and right inputs.
BS2 • 5
BS2C CIRCUIT DESCRIPTION
We will go through the BS2C section by section, but most circuitry that used to
be in separate circuits in the BS1 has been fully integrated into the BS2C main
chip. For example, you can switch between the microphone and line inputs
digitally so you can select them using the front panel switches. The part also
contains a speaker power amplifier so we no longer n eed a separate IC for this.
The BS2C power supply: The power supply is fairly basic in that we only need a
single voltage to run the entire kit. The trend these days is to run things from
lower voltages for faster operation and less power requirements, so all of the
parts in the BS2C run from 3.3V. VR1 is a low-dropout 1.5 Amp regulator,
though we will hopefully never pull that much current with the BS2C during
operation. This part “smoothes” out the incoming, usually noisy wall wart power
supply voltage into a nice, clean, predictable voltage to supply all of the other
components.
The BS2C “brains”: The brain of this kit is a nice Motorola microcontroller, the
MC68HRC908JK1. This part contains 1.5K of ROM for all the memory required
for the program and space saving settings. Compare that to your PC memory
space! This part is used to interpret the key presses, and then act on them by
controlling the voice recorder IC, U3. It also controls the LED display and
monitors for “End of Message” indications from U2, the voice recorder, to know
when to replay messages.
The BS2C sound recorder IC: This part is a fully integrated component, loaded
with options for switching audio, mixing audio, adjusting gains, changing
BS2 • 6
sample rates. . . all controlled through a serial acce ss method (called SPI for
Serial Peripheral Interface) by the microcontroller. This truly is an amazing part!
There are so many features that we couldn't take advantage of them all, but are
using some of the best ones for this product.
The Display: The display is driven by a serial shift register rather than a display
decoder so we can have more versatility in the number of digits shown. The
same serial lines used for the voice recorder can be used to drive U4, making
efficient use of the I/O lines on the microcontroller. It has the added benefit of
being very low noise during operation so as not to interfere with the recording.
U1:A, U1:B, The line level circuit: This circuit takes the differential output from
the sound recorder and converts it to single-ended so that you can use it
properly on RCA type connections. It also provides for a bit of filtering and
some gain control to better match your system levels.
These are the primary blocks of circuitry in the BS2C. Now it is time to collect
your soldering iron, tools, and wits, and start putting this neat project together!
BS2 • 7
PARTS SUPPLIED WITH BS2C VOICE RECORDER KIT
Capacitors
9 0.1uF ceramic capacitors (Marked 104) [C5,7,9,11,13,15,17,19,20]
2 0.01uF ceramic capacitors (Marked 103) [C8,10]
1 10pF ceramic capacitor (Marked 10p or 10) [C18]
1 4.7uF Electrolytic capacitor [C12]
7 10uF Electrolytic capacitors [C1,2,4,6,16,21,23]
2 470uF Electrolytic capacitors [C3,14]
Resistors
1 330 ohm resistor (orange-orange-brown) [R15]
9 470 ohm resistors (yellow-violet-brown) [R17,25,26,28,29,30,31,32, 33]
1 1k ohm resistor (brown-black-red) [R7]
5 2.2 k ohm resistors (red-red-red) [R9,11,14,16,18]
14 10k ohm resistors (brown-black-orange)
[R1,2,3,5,8,10,12,19,20,21,22,23,24,27]
1 10k ohm vertical trimmer pot [R13]
1 1k ohm horizontal trimmer pot (Marked 103, orange adjustment)[R6]
Semiconductors
1 1N4000 series diode (epoxy case marked 1N4000 to 1N4004) [D2]
1 Red LED [D6]
1 Green LED [D5]
1 LM1086CS-3.3 3.3Volt 1.5A voltage regulator [VR1]
1 LMC6482AIN Dual Rail to Rail Opamp IC [U1]
1 ISD5008P Voice Recorder IC [U2]
1 74HC595AN Serial to Parallel shift register IC [U3]
1 MC68HRC908JK1 Microcontroller IC (marked with white sticker) [U3]
1 7-segment display (LTS367P)
Inductors
1 22uH inductor (fatter than a resistor, red-red-black-gold) [L1]
Hardware, Misc.
6 Horizontal push-button switches [S2,3,4,5,6,7]
1 DPDT Power switch [S1]
2 3.5mm monaural style switch jacks [J5,12]
1 2.1mm Center-pin positive power jack [J1]
1 Single RCA jack [J9]
1 Dual RCA jack [J2]
1 20-pin socket for U3
1 28-pin socket for U2
1 MC-1 microphone cartridge [MC1]
3 8-pin dual-row headers [J6,8,11] (These are also [J4,7,10])
1 BS2C printed circuit board
BS2 • 8
Required, not supplied
6 Volt DC power transformer
Optional
Line level audio source (such as a tape deck or CD player)
Shielded stereo audio cables
Speaker
Case and Knob Parts
Top Cover
Bottom Base Tray
4 - Short Phillips Head Screws
2 - Long Philli ps Screws
Front and Rear Plastic Panels with Labels
4 - Rubber Feet
Appropriate Knobs for Kit
Required Tools
Pen or Pencil
Small Phillips Head Screwdriver
Solderi ng Iron
60/40 Rosi n Core Solder
Wire Clippers
Safety Glasses
BS2 • 9
BS2C PARTS LAYOUT DIAGRAM
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