Advertisement
Quick Links
CB1 CHATTERBOX
VOICE RECORDER
Ramsey Electronics Model No.
Getting tired of repeating yourself? Find yourself saying the
same thing over and over? Here's the answer to your prayers!
This kit will repeat your voice with amazing clarity over and
over, without ever getting tired, in a number of different ways!
Not only that, it preserves your voice even when the power is
turned off.
• 20 seconds of recording time available in five, four second
messages. Messages can be combined for longer record and
playback times.
• Loud 2 Watt audio output.
• Very clean, low noise "DAST" storage technology provides
excellent audio quality.
• Seven modes of operation available. Even interfaces to radios
and computers too!
• Fully microprocessor controlled for easy use, no diodes to add -
no dip switches to set. Easy and fun to use!
• LED displays show addresses and modes quickly, no guesswork.
• Compatible with most transceivers and works with most radio
mikes. It will even key your radio with your message.
• Can be used for: memos, HAM contesting, real estate sales,
leaving the kids messages, CB radio...possibilities are unlimited!
CB-1 • 1
CB1
Advertisement
Related Manuals for Ramsey Electronics CB1 CHATTERBOX
Summary of Contents for Ramsey Electronics CB1 CHATTERBOX
- Page 1 CB1 CHATTERBOX VOICE RECORDER Ramsey Electronics Model No. Getting tired of repeating yourself? Find yourself saying the same thing over and over? Here's the answer to your prayers! This kit will repeat your voice with amazing clarity over and over, without ever getting tired, in a number of different ways! Not only that, it preserves your voice even when the power is turned off.
- Page 2 · 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. CB-1 CHATTERBOX KIT INSTRUCTION MANUAL Ramsey Electronics publication No. MCB-1 Revision 2.1a First printing: April 1994 COPYRIGHT 1994 by Ramsey Electronics, Inc.
-
Page 3: Table Of Contents
Ramsey Publication No. MCB1 Price $5.00 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR CB1 CHATTERBOX RECORDER KIT TABLE OF CONTENTS Introduction to the CB-1 ....4 How it works ........5 Parts list ........7 CB-1 Assembly instructions ..8 Initial testing ........ 17 Troubleshooting ...... - Page 4 • Ideal for contests, repeaters, CB radio or any other application that requires repetitive speech or sounds INTRODUCTION TO THE RAMSEY CB-1 VOICE RECORDER We're sure you've found that it gets tiring repeating what you have just said over and over again, whether you are contesting, or just simply using your radio a lot.
- Page 5 occur, the manual will lead you through step by step in the troubleshooting guide until you find the problem and are able to correct it. CIRCUIT DESCRIPTION Most of the difficult work in this circuit is performed by the ISD1020 voice recorder IC chip (U4) and the MC68HC705 series microprocessor (U3).
- Page 6 RAMSEY "LEARN-AS-YOU-BUILD RECORDER ASSEMBLY STRATEGY" The CB-1 voice recorder kit includes two PC boards, one being the main board and the other a display board. They are mounted at a 90 degree angle to each other so that the display may be easily read from the front of the kit.
-
Page 7: Parts List
RAMSEY CB-1 CHATTERBOX PARTS LIST SEMICONDUCTORS ISD1020A sound recorder IC [U4] MC68HC705K1 microprocessor IC [U3], 16 pin IC with white sticker LM380 2 watt audio amplifier IC chip [U2] MC14511 (4511) BCD to 7 segment IC chip [U1] 7805 5 volt regulator [VR1]... - Page 8 CONSTRUCTION OF THE CB-1 VOICE RECORDER The first thing we will do is locate the two PC boards used with this kit, and then find where we will be starting construction. The smaller board, with the 3/8" hole in it, is called the display board. We'll construct it last since it has finer traces, and a little practice on the bigger board will be of help.
- Page 9 10. Install C19, .01uF disc capacitor (marked .01 or 103 or 10nF). This capacitor prevents DC voltage on the microphone from entering the ISD1020 IC chip. A capacitor allows AC signals such as voice to pass through, but blocks any DC voltage. 11.
- Page 10 switches. Switch bounce is literally mechanical bounce that results from the pressing of the switch. High speed electronic circuits will see this bouncing and will respond as though the switch was depressed many times very quickly. Typical switch bounce is in the 10 to 20 millisecond range (that's 10 to 20 thousandths of a second!).
- Page 11 The circuitry you're working on now is the display driving circuit. When the input to the circuit is low (near ground or zero volts), Q6 is off, which turns Q4 on, turning on only the address display. When the input is high (near +5V), Q5 turns on and only the mode display is on.
- Page 12 Depending on what type of microphone your radio requires depends on whether or not this resistor is used. In all of the Ramsey FX series transceivers and most handhelds, the resistor is required. We'll look at this part later when we get to the MICROPHONE CONSIDERATIONS section.
- Page 13 Take a break and get your soldering skills saved up for the construction of the display board. Locate the small display board and install the following parts: 65. Install U1, a 4511, BCD to 7 segment display driver IC. Do not use a socket for this part since it must sit below the LED displays.
- Page 14 from the backside of the display board through the 3/8" hole. The tab on the potentiometer must be removed. Attach the mounting hardware securely. 77. Here's the tricky part of assembly - mounting the display board to the main board. The most important part of this step is achieving a nice right angle between the display board and the main board.
- Page 15 labeled MIC1 near VR1. NOTE: In steps 84 through 88, connections CCW, SW-B, W, CW and SW- A are labeled on your board. These connections all refer to POT1, the volume control. Please identify these connections using the parts layout diagram on page 21 or using the picture at the right. 84.
-
Page 16: Initial Testing
88. Connect a 7" piece of black wire from the pin labeled SW-A on the potentiometer to the hole labeled SW-A on the main board near VR1. Solder the wire in place. Finally! You've just completed the assembly of your CB-1 and now you're almost ready for a test run. -
Page 17: Troubleshooting
6. Switch the voice recorder to mode 6 and address 1. Press and hold down the start button while talking into the microphone. Release the start button when you are done recording. Switch back to mode 1 and press the start button. Your message should be audible at the speaker. The decimal points of the displays should light as long as you hold the start button. - Page 18 PROBLEM: A segment or two is out on one or both displays, or odd numbers are displayed. SOLUTION: These problems most often occur right behind the displays, where solder bridges and cold solder joints form. Don’t worry; even some experienced solderers still have trouble with these. PROBLEM: Decimal point is always on.
- Page 19 CB-1 • 19...
-
Page 20: Microphone Considerations
MICROPHONE CONSIDERATIONS The CB-1 has a built-in miniature electret condenser microphone which is ideal for stand alone operation. If you would like to use an external microphone, it can be connected to the "MIC IN" jack, J3. Any sort of microphone may be used. In addition, the CB-1 is designed to be used with push-to-talk (PTT) microphones of the Icom/Yaesu/Radio Shack variety. -
Page 21: Parts Layout Diagram
CB-1 PARTS LAYOUT DIAGRAM CB-1 • 21... - Page 22 Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All Ramsey kits will work if assembled properly. The very fact that your kit includes this new manual is your assurance that a team of knowledgeable people have field-tested several "copies"...
- Page 23 Intermediate ..5 hrs Advanced .....3.8 ADDITIONAL SUGGESTED ITEMS • Soldering Iron Holder/Cleaner (RS-64- Price: $5.00 Ramsey Publication No. MCB-1 Assembly and Instruction manual for: RAMSEY MODEL NO. CB-1 RAMSEY ELECTRONICS, INC. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 Fax (716) 924-4555 CB-1 •...