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| Electronic Project Kits |
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SOUND ACTIVATED FM TRANSMITTER 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 good range and the circuit powers down unless it “hears” sounds, reactivates with a sound. 80-280 ................................. $13.95 |
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ELECTRONIC COMBINATIONLOCK This really is an excellent introduction into electronic security systems. Set your own four digit code, a wrong sequence simply resets the lock. The correct code will activate a relay that can handle up to 240 volts AC. The nine digit key-pad is on a separate board connected to the circuit via a ribbon cable (30”), so a variety of mounting ideas are possible. Requires a 9 or 12 volt battery or supply. 80-290 ................................. $14.95 |
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TWO STAGE FM TRANSMITTER OR WIRELESS MICROPHONE 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 transmitter that you can legally purchase. An electret microphone is used to add sensitvity. the circuit can run on six volts, greatest output is 12 volts, but uses 9 volts and short antenna wire to stay legal. 80-320 ................................... $9.95 |
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ION
GENERATOR Are there some healthful positive benifits caused by being in an environment that contains negative or positive ions? Some reports suggest a wide range of benefits. This generator can be set up to generate either negative or positive ions, the builders choice. Operation from 117 Volts AC power line. You will need to find a case or box for the final assembly, about 2” x 4-1/4” and an inch in depth and an AC power cord from an old lamp (or buy new). You can actually feel the flow of ions from the unit. 80-570 ................................. $19.95 |
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PIR MOVEMENT DETECTOR One of our favorite circuits. The circuit sees infrared heat, such as from intruders body. The kit uses a late development in movement IC’s and employs a very sophisticated circuit. You may set it to non-trigger in daylight hours. When tripped, an LED indicator lights and relay is tripped. “Sees” up to about eighteen feet. Operation on 9 to 12 volt battery with very long life. 80-300 ................................. $34.95 |
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5 LED MULTI-SEQUENTIAL
FLASHER Flashes five, very bright LED’s in any one of seven user-selectable patterns. A COB (chip-on-board) IC makes assembly very easy, the chip is supplied premounted on its own board and a motherboard contains the entire circuit. Operates on 3 volts DC, battery holder included. Continuously repeats a sequence when power is supplied. 80-375 ................................... $9.95 |
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INFRARED TOGGLE SWITCH Control about any device using the remote control from just about any TV set. The circuit switches an on-board SPDT relay, turn it on with the remote and turn it off with another signal. The relay contacts are rated one amp at 125 volts AC. The circuit operates on any DC supply from 8 to 15 volts, use an old calculator supply etc.. This circuit can have some very practical applications such as turning on a light by an invalid. Your imagination is the limit. 80-580 ................................. $19.95 |
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(LOUD) 9 VOLT SIREN A simple circuit with alot of output. Uses a voltage controlled oscillator and includes a half watt speaker. Connect it to an alarm system, sound switch or whatever you dream up. 9 volt battery operation. 80-310 ................................... $10.95 |
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GENERAL PURPOSE, 3-1/2 DIGIT
LCD PANEL METER A versatile meter which may be set up for any one of many ranges, for voltage or current. The decimal point is selectable too (i.e. you may put it where you want it). Space is provided on the circuit board for scaling and shunt resistors. Runs on nine volts, very low current drain. Easy to read. 80-340 ................................. $31.95 |
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8 WATT AUDIO AMPLIFIER Low voltage oper ation does not mean low-power. This amplifier can produce a full eight watts into a standard four or eight ohm “load”, such as a speaker. Actually, it can deliver up to 11 watts if you use a 16 volt supply. You may use this amplifier with a wide range of power supplies, from 5 volts to 20 volts. The IC has a built-in current limiting and over-heating proteation. An ideal building block for use with many projects. The audio quality is excellent. 80-470 ................................. $19.95 |
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