Unique Products and Components
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A small circuit, using the Mar-6 Amplifier IC, this kit will provide as much as 20 db gain. Connect at receiving antenna input; will boost signals from 1 mHz to 1000mHz; two RF amplifier kits may be cascaded for use at low, broadcast-band frequencies.
Use with Scanners, Ham receivers, SWL receiver etc. You could add a metal case and RF connectors for permanent use. May be used to boost signal for scope or frequency counter as well. Price: $18.49
If someone put a BUG (listening device) in your meeting room, would you know it? Todays small circuits make listening devices too easy to conceal to ignore. You may want to assemble this one for resale to nervous and needy users.
A high quality circuit, should be considered even by the professional. It will detect any transmitter sending A.M. or F.M. or just C.W. at frequencies anywhere from ten to 450 MHz; peak sensitivity is in the 80 to 120 MHz portion where many bugs would be found. The signal strength is indicated on a bargraph, so the closer to the source you get, the higher the indication.
With some practice, you should be able to find a covert transmitter to within a few inches of its location. "Professional" bugs, placed by serious operators can be found easily. Operation on 9 Volt battery for portability.
We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).
Click Here For Picture Of Soldering Kit # S540. Price: $36.23
Try this with your computer to re-transmit Internet radio! This is truly a slick product! The PLL (phase locked loop) tuning means stable broadcasting, which results in big advantages. Being on frequency and drift-free equals much better transmit distance and receive quality.
Frequency is "entered-in" on a keypad, and the unit stays exactly on frequency. Transmit to your portable radio! For input use your CD player or tape player or your computer so that you can broadcast programming on the Internet to your portable radio; listen anywhere around the home. Operates on 9 to 12 Volts DC.
Click Here For Picture Of Soldering Kit # S540. Price: $98.71
This is the Cadillac of miniature, concealable FM transmitters, and wireless mikes .
Transmits in the standard FM radio band; tune to open frequency. Varactor tuning results in stable signal, free from stray capacitance and drifting. Sensitive, picks up conversations from several feet. Powerful operation on a nine volt battery but could use 12V DC if you are going for distance. Easy to build, good for teaching beginners with just a bit of supervision.
Click Here For Picture Of Soldering Kit # S540. Price: $17.18
An exciting circuit, the PLL Experimenter kit may be used for making a stable AM or FM transmitter, a Signal Generator (from low kHz to about 185mHz), a QRP Ham transmitter, circuit diagrams for all of these are included.
What you get is a very high quality PLL circuit module, with touch-tone style keyboard (to set frequency) and you will have to add the components for the circuits mentioned above. Crystals can be expensive; here is the answer.
Not a beginners kit; intended for the serious experimenter, Hams or very advanced beginner. Operation from 8 to 12V DC; a nine volt battery is ideal. Fine tuning in 10 kHz steps. Extra room on board for added components. This circuit is really worth having!
Click Here For Picture Of Soldering Kit # S540. Price: $45.96
This is a circuit that will broadcast CD quality sound to your FM Walkman, home stereo or automobile radio.
It produces a strong signal that will generally cover the average home and yard. It is stable enough to use even with digitally tuned FM receivers.
Typical uses include broadcasting your own music to a receiver at pool-side or in the garden. Or, you could broadcast from a personal, portable CD player to a car radio that has no CD player. School uses include running a "broadcast station" from another room as a speech class exercise. The unit is powered by a 9V transistor battery, or you could use an AC wall adaptor.
Click Here For Picture Of Soldering Kit # S540. Price: $45.95
This is a very popular kit and the most powerful circuit weve seen that operates on such low voltage (just two AA cells). A range of 100 meter can be expected and given a good antenna and good conditions, 500 meters is not unusual.
Can be operated on up to about 9 volts. Transmits to the FM radio band. Teaches basics of transmitters. Microphone is included.
Miniature transmitter attaches to the phone line and transmits the conversation. Transmits 200 yards and more in most installations. Tunable to clear spot on the FM band of your radio. Completely parasitic; i.e. uses the power from a telephone line and needs no battery. The circuit might be used to share or record conversation, but not to be used illegally. Price: $14.44
Sound turns on the transmiter, which operates in the FM radio band. A neat way to catch a thief in another room or garage. The volume of sound needed to trigger the circuit is adjustable.
The two stage transmitter has a good range and the circuit powers down unless it "hears" sounds, reactivates with a sound is detected.
A powerful little circuit with surprisingly good audio quality. Can transmit up to about 1/2 mile in open country. This is probably the most powerful FM band transmitter that you can legally purchase.
An electret microphone is used to add sensitvity. The kit includes a 4 AA battery holder to run the circuit at six volts, greatest output is 12 volts, but use 9 volts (or less) and a short antenna wire to stay legal.
Click Here For Picture Of Soldering Kit # S540. Price: $14.44
This is a complete AM radio for the standard broadcast band, most of which is on a single IC. Other components, such as the coils and variable capacitor to make a finished radio are included.
The IC is the RF amp, detector and AGC circuitry. The ICs output drives a two stage transistor audio amplifer and 3 ohm speaker. Operates on a 9 volt battery.
A good kit for beginners to see and build. Click Here For Picture Of Soldering Kit # S540. Price: $24.49
Two separate relays can be switched via encoded signals transmitted from a keychain size, two-button transmitter (like those used for car alarms and electric car doors).
Push a button and relay toggles "closed" and one more push toggles it "open". Transmit distance is about 120 feet maximum. The receiver requires from 12 to 15 volts DC. The transmitter is supplied assembled and tested complete with its own battery.
Tricky (receiver) parts of the circuit are supplied already-assembled and tested; just plug them in and solder in place. Each relay can handle up to 10 amps @ 120V AC; plenty for numerous applications; control lights, door locks, magic shows etc.
Click Here For Picture Of Soldering Kit # S540. Price: $59.95
A two board FM Stereo Transmitter kit with the best possible features that our designers could think of. In addition to very clean, accurate stereo reproduction, the PLL tuning provides stability that is simply not available in most transmitters.
Unit has an LCD display with an EEPROM memory to retain frequency setting even if powered down. Listen on your Walkman, or any stereo FM radio in your home or car.
The top board is the controller, with the keypad switches and LCD readout. The bottom board is the transmitter, employing an NJM2035 for the stereo generator, buffered tuning from the PLL for quiet performance and an RF amp stage on the output. The circuit can be tuned in 5K steps, for fine tuning.
You will want to use a very "clean" power supply for this circuit; batteries (12 volts DC, at least 75mA.) are a perfect source of power. Or, a well filtered power supply to be sure to eliminate power line hum. This circuit can broadcast any line-level input, such as a computer sound card, CD player, tape player etc. far enough to provide excellent reception around an average house and yard. Instructions for a low cost FM antenna are included. The top board size is 5 1/2" long and 3.3" in width; the finished unit fits neatly into a Philmore No PB170 plastic case (which is not in the kit, sold separately). The unit will function on voltages as low as 9 volts and as high as 14.9 volts; at the suggested 12 VDC the unit needs up to 75mA supply.
While assembly is easy and straight forward, we suggest the kit only for builders with some experience in kit building
Click Here For Picture Of Soldering Kit # S540. Price: $131.95
PLL-VFO Experimenter Package (experienced builder only) 440Khz to 185mHz.! This new VFO circuit is a two part (two board) system for the experimenter. The "bottom board" (photo) is the PLL and VFO, complete with an area for the experimenter to add whatever circuit he desires; such as a transmitter, receiver, transceiver etc..
The "Top Board" (photo not here yet) is a controller with a keypad for frequency entry and an LCD digital readout that displays frequency. The Top Board controller communicates with the MC145170 chip on boards may be stacked with spacers and will mount neatly in a Philmore No. Model PB170 plastic case (not included). Not intended to be a complete kit, this circuit pair is intended to provide a highly flexible platform for the experimenter, student or Ham radio builder etc..
The circuits provide Rock-Solid frequency control with a very easy to use human interface (thats fancy for push-bottom keypad and readout). Included are circuit ideas, in schematic form, including a forty-meter transmitter and a radio receiver circuit. The prototyping area is large; the user can build a simple or multi-stage AM or FM receiver, CW rig, signal generator etc. The circuit may be used with various oscillator designs from 440Khz to 185Mhz.
The circuit employs an MC145170 PLL IC which provides drift-free tuning with considerable stability. Operates on 12 volts DC. You will need up to 100mA to power the kit plus dont forget to add enough current capability to handle your own addition to the PC board.
Click Here For Picture Of Soldering Kit # S540. Price: $121.95