Cb-1 • 1 ramsey electronics model no. Cb1 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...
Cb-1 • 2 ramsey transmitter kits · fm100 professional fm stereo transmitter · fm25 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...
Cb-1 • 3 cb1 chatterbox recorder kit ramsey publication no. Mcb1 price $5.00 table of contents introduction to the cb-1 ................ 4 how it works .................................. 5 parts list ........................................ 7 cb-1 assembly instructions .......... 8 initial testing ....
Cb-1 • 4 cb-1 chatterbox voice recorder features • led display for mode and address • up to five separate four second addresses can be accessed • easy to use microprocessor control • seven modes available: mode 1: play selected message once. Mode 2: play through messages until button is released. Mo...
Cb-1 • 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 microproce...
Cb-1 • 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. It is obvi...
Cb-1 • 7 ramsey cb-1 chatterbox parts list semiconductors r 1 isd1020a sound recorder ic [u4] r 1 mc68hc705k1 microprocessor ic [u3], 16 pin ic with white sticker r 1 lm380 2 watt audio amplifier ic chip [u2] r 1 mc14511 (4511) bcd to 7 segment ic chip [u1] r 1 7805 5 volt regulator [vr1] r 7 2n3904...
Cb-1 • 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 trace...
Cb-1 • 9 r 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. R 11. Install jumper jmp7. Use a scrap piece o...
Cb-1 • 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...
Cb-1 • 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. When the ...
Cb-1 • 12 r 49. Install r7, 2.2k ohm resistor (red-red-red). This part plays a role in the keying of an attached radio. 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 resist...
Cb-1 • 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: r 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 dis...
Cb-1 • 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. R 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 ni...
Cb-1 • 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. R 8...
Cb-1 • 16 r 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. First go over all connec...
Cb-1 • 17 r 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...
Cb-1 • 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...
Cb-1 • 19.
Cb-1 • 20 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 de...
Cb-1 • 21 cb-1 parts layout diagram.
Cb-1 • 22 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. 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...
Cb-1 • 23 cb-1 "chatterbox" voice recorder quick reference page guide introduction to the cb-1 ................... 4 how it works ..................................... 5 parts list ............................................ 7 cb-1 assembly instructions .............. 8 initial testing ...............
