TREASURE FINDER METAL DETECTOR KIT Ramsey Electronics Model No. TF-1 Ahoy mates ! Go searching for buried treasure in your own backyard, nearby park, or on the beach. This professional quality unit can find metal at a depth of six inches! Talk about your ideal project, this one will literally “pay for itself” finding hidden treasures! • Sensitive...you bet ! Uses a Faraday shielded search coil just like the pro’s ! • Runs on 9-12 volts DC ; internal power regulation for “rock solid” performance.
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Ramsey Publication No. MTF-1 Price $5.00 INSTRUCTION MANUAL FOR TREASURE FINDER METAL DETECTOR TABLE OF CONTENTS Introduction to the TF-1 ................. 4 TF-1 Circuit Description ................ 4 TF-1 Assembly Steps ..................... 8 Schematic diagram ...................... 12 Component Layout ....................... 13 Initial Testing ................................ 21 Troubleshooting ........................... 22 Ramsey warranty ......................... 23 RAMSEY ELECTRONICS, INC.
INTRODUCTION Searching for buried treasure has been a childhood dream for most of us.
So this oscillation is generating a “pulsating” magnetic wave. This magnetic wave expands and contracts around the coil. When this magnetic “wave” comes in contact with a metal object it induces a small voltage at either end of the metallic “target”. With this induced voltage across the target object, a small current begins to flow causing a “counter” magnetic field to be generated by the target metal.
D3 is a zener type diode which accomplishes our regulation task. The power indicator LED provides a visual display when the circuit is energized. The local oscillator section of the circuit consists of U1 and its associated components. This 8 pin chip contains a complete oscillator and mixer circuit. This amazing little chip takes the place of several functional “blocks” critical to our metal detector design.
❒ ❒ 4 2 ❒ ❒ ❒ ❒ 6 2 2 1 .01uF disc capacitors (labeled .01 or 103 or 10nF) [C6,10,16,13] .01 uF Mylar capacitor (in a rectangular case [looks like a Chicklet] labeled 103) [C7,18] .1uF disc capacitors (labeled .1 or 104) [C2,3,8,11,14,15] 10 uF electrolytic capacitor (labeled 10uF) [C1,4] 220 uF electrolytic capacitors (labeled 220uF) [C9,12] 100 uH inductor (coil on form with hex tuning slug) [L2] SEMICONDUCTORS AND INTEGRATED CIRCUITS ❒ ❒ ❒ ❒ ❒ ❒ 1 1 1 1 1 1 6.
• • • • Use a 25-watt soldering pencil with a clean, sharp tip. Use only rosin-core solder intended for electronics use. Use bright lighting, a magnifying lamp or bench-style magnifier may be helpful. Do your work in stages, taking breaks to check your work. Carefully brush away wire cuttings so they don't lodge between solder connections. We have a two-fold "strategy" for the order of the following kit assembly steps.
treasure finder kit, it is best to follow the step by step instructions. Try to avoid the urge to “jump ahead” installing components. Since you may appreciate some “warm-up” soldering practice as well as a chance to put some “landmarks” on the PC board, we’ll first install some of the larger mounting components. This will also help us to get aquainted with the up - down, left - right orientation of the circuit board.
“jumper” connection wires later. Resistors are not polarized, they may mount in either direction. ❒ 7. Install LED D1. Being a diode, this component is polarized and must be oriented correctly. Examine the LED and notice how one lead is longer than the other. The longer of the two leads is the anode, or (+) connection. Most diodes also have a flat side molded in the component body. This corresponds to the cathode or (-) side of the part.
❒ 18. Install C18, a .01 uF mylar capacitor (marked 103). We chose to use a mylar cap in this position because mylar caps show greater stability than standard ceramic disc caps; and since this is used in the oscillator frequency determining section we wish to keep this value as “rock solid” as possible. ❒ 19. Install U1, the NE602 mixer oscillator IC. Make sure to align the notch or dot associated with pin one with the notch shown in the parts layout diagram.
TF-1 COMPONENT LAYOUT TF1 • 12
❒ 31. Identify C1, the 10 uF electrolytic capacitor. Electrolytic capacitors are polarized with a (+) and (-) lead and must be installed in the correct orientation. Ordinarily, only the negative side is marked on the capacitor body with a dark band and the (-) sign clearly shown, while the PC boards will usually show the (+) hole location. Use care to ensure proper polarity. See the parts diagram for proper placement. The capacitor should fit snugly down to the PC board. ❒ 32.
❒ 43. Install C14, .1uF disc capacitor (marked .1 or 104). ❒ 44. Install R10, 120 ohm (brown-red-brown). ❒ 45. Install the 9V battery connector to the “RED” and “BLK” holes, respectively. ❒ 46. Install the 9V battery clip using a scrap component lead to hold it on the PC board. Once the leads are soldered on the solder side of the PC board, you can solder the component lead to the bottom of the battery clip for better mechanical stability. Whew! That's about it for the main circuit board assembly.
forming our treasure finder! L O O P S H IE L D 2 2 " tu rn s " th r o u g h th e lo o p s h ie ld ❒ 2. Fit together the pre drilled sections of PVC tubing as shown. DO NOT GLUE THE PVC TOGETHER AT THIS TIME. This is our first fitting and we want to be sure everything is just right before we finalize the tubing.
❒ 3. With the PVC pushed together, slip the mini coaxial cable through the coil wire hole, as shown, and feed the wire through until it falls through the coil mounting slot. Be sure to leave yourself at least 6 inches of extra wire at each opening for final assembly. Next we’ll prepare the ends of the coaxial cable for final assembly. Usually a good sharp knife or razor cutter does a good job at removing the outer insulation. Use caution as not to cut too deeply into the “braid” of the coax.
LOOP SHIELD VIEWED FROM ABOVE FLATTEN ENDS OF SEARCH COIL TUBING enameled wire with solder for easy connections later. Well you’ve almost made it to the completion of your treasure finder. Just a few more steps and you will be beachcombing! ❒ 7. Now we’ll attach the coaxial cable to the coil assembly. Affix the center conductor of the coax to one end of the search coil.
insulation may overheat and cause a short in the cable. Once your soldering is complete you may slide the crimped ends of the coil into the slots cut in the PVC tubing and insert the PVC endcap supplied with your kit. ❒ 9. Now we’ll affix the bottom half of the case to the pre drilled PVC tubing. Using the two #6 self tapping screws provided and running the circuit board prepared cable through the third hole, screw the bottom half of the case into place. ❒ 10.
CONGRATULATIONS Your treasure finder is now complete! Have a final look over your work, paying particular attention to the orientation of diodes, transistors and IC’s. INITIAL TESTING OF THE METAL DETECTOR This kit was purposefully designed to “plug and play” with minimal testing upon completion. Install a fresh nine volt battery and depress the power switch. The power on led should illuminate. Turn the volume control to about half, and adjust the tone control.
TROUBLESHOOTING INSTRUCTIONS While we had hoped that it wouldn’t come to this, if you are having trouble with your treasure finder here are a few suggestions. Use a methodical, logical troubleshooting technique. Most problems can be solved using common sense. A volt-ohm meter and a clear head are usually all that are needed to correct any problem. Most problems are due to misplaced parts and/or bad solder connections. Working backwards through the assembly steps will often lead you to the problem.
CONCLUSION We sincerely hope that you enjoy the use of this Ramsey product. As always, we have tried to compose our manual in the easiest, most “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in future publications. Please submit comments or ideas to: Ramsey Electronics Inc. Attn.
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 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" of this kit straight from the Ramsey Inventory.
Treasure Finder Metal Detector Quick Reference Page Guide Introduction to the TF-1 ................ 4 TF-1 Circuit Description ................ 4 TF-1 Assembly Steps .................... 8 Schematic diagram ...................... 12 Component Layout ...................... 13 Initial Testing ................................ 21 Ramsey warranty ......................... 23 This Quality Electronics Kit was designed and packed in the USA Price: $5.00 Ramsey Publication No.
